FM / linux

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/

/usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux

Name	Size	Mode	Actions
amba/	-	0755	rm
avf/	-	0755	rm
bcma/	-	0755	rm
byteorder/	-	0755	rm
can/	-	0755	rm
ceph/	-	0755	rm
clk/	-	0755	rm
crush/	-	0755	rm
decompress/	-	0755	rm
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
hsi/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	0755	rm
mfd/	-	0755	rm
mlx4/	-	0755	rm
mlx5/	-	0755	rm
mmc/	-	0755	rm
mtd/	-	0755	rm
mux/	-	0755	rm
net/	-	0755	rm
netfilter/	-	0755	rm
netfilter_arp/	-	0755	rm
netfilter_bridge/	-	0755	rm
netfilter_ipv4/	-	0755	rm
netfilter_ipv6/	-	0755	rm
pcs/	-	0755	rm
perf/	-	0755	rm
phy/	-	0755	rm
pinctrl/	-	0755	rm
platform_data/	-	0755	rm
power/	-	0755	rm
qed/	-	0755	rm
raid/	-	0755	rm
regulator/	-	0755	rm
remoteproc/	-	0755	rm
reset/	-	0755	rm
rpmsg/	-	0755	rm
rtc/	-	0755	rm
sched/	-	0755	rm
soc/	-	0755	rm
soundwire/	-	0755	rm
spi/	-	0755	rm
ssb/	-	0755	rm
sunrpc/	-	0755	rm
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
uwb/	-	0755	rm
wimax/	-	0755	rm
8250_pci.h	1038	0644	edit dl rm
a.out.h	354	0644	edit dl rm
acct.h	2551	0644	edit dl rm
acpi.h	43130	0644	edit dl rm
acpi_apmt.h	367	0644	edit dl rm
acpi_dma.h	3300	0644	edit dl rm
acpi_iort.h	3235	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3908	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1772	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1875	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6931	0644	edit dl rm
amd-pstate.h	3356	0644	edit dl rm
anon_inodes.h	494	0644	edit dl rm
aperture.h	1619	0644	edit dl rm
apm-emulation.h	1575	0644	edit dl rm
apm_bios.h	2746	0644	edit dl rm
apple-gmux.h	1459	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	1983	0644	edit dl rm
arm-cci.h	2058	0644	edit dl rm
arm-smccc.h	16066	0644	edit dl rm
arm_sdei.h	2641	0644	edit dl rm
array_size.h	332	0644	edit dl rm
ascii85.h	532	0644	edit dl rm
asn1.h	2039	0644	edit dl rm
asn1_ber_bytecode.h	2783	0644	edit dl rm
asn1_decoder.h	675	0644	edit dl rm
assoc_array.h	3156	0644	edit dl rm
assoc_array_priv.h	5630	0644	edit dl rm
async.h	4591	0644	edit dl rm
async_tx.h	7487	0644	edit dl rm
ata.h	33980	0644	edit dl rm
atalk.h	4550	0644	edit dl rm
ata_platform.h	729	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10457	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1502	0644	edit dl rm
atmel_tc.h	11600	0644	edit dl rm
atm_suni.h	253	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	37546	0644	edit dl rm
attribute_container.h	2799	0644	edit dl rm
audit.h	20332	0644	edit dl rm
audit_arch.h	559	0644	edit dl rm
auto_dev-ioctl.h	454	0644	edit dl rm
auto_fs.h	436	0644	edit dl rm
auxiliary_bus.h	2787	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
b1pcmcia.h	666	0644	edit dl rm
backing-dev-defs.h	10327	0644	edit dl rm
backing-dev.h	12260	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	6745	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2660	0644	edit dl rm
bcm47xx_nvram.h	1247	0644	edit dl rm
bcm47xx_sprom.h	600	0644	edit dl rm
bcm47xx_wdt.h	555	0644	edit dl rm
bcm963xx_nvram.h	3036	0644	edit dl rm
bcm963xx_tag.h	3685	0644	edit dl rm
binfmts.h	5443	0644	edit dl rm
bio.h	20690	0644	edit dl rm
bitfield.h	5899	0644	edit dl rm
bitmap.h	21496	0644	edit dl rm
bitops.h	8870	0644	edit dl rm
bitrev.h	2541	0644	edit dl rm
bits.h	1512	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22728	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	234	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	16074	0644	edit dl rm
blk-pm.h	717	0644	edit dl rm
blkdev.h	58898	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3777	0644	edit dl rm
blk_types.h	15342	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1938	0644	edit dl rm
bottom_half.h	803	0644	edit dl rm
bpf-cgroup.h	19818	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	73387	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	1733	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5349	0644	edit dl rm
bpf_lsm.h	1431	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5395	0644	edit dl rm
bpf_verifier.h	18791	0644	edit dl rm
brcmphy.h	14023	0644	edit dl rm
bsearch.h	275	0644	edit dl rm
bsg-lib.h	2455	0644	edit dl rm
bsg.h	1094	0644	edit dl rm
btf.h	7363	0644	edit dl rm
btf_ids.h	5174	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	6999	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14379	0644	edit dl rm
bug.h	1967	0644	edit dl rm
buildid.h	248	0644	edit dl rm
build_bug.h	3066	0644	edit dl rm
bvec.h	4119	0644	edit dl rm
c2port.h	1529	0644	edit dl rm
cache.h	2182	0644	edit dl rm
cacheinfo.h	4796	0644	edit dl rm
capability.h	8179	0644	edit dl rm
cb710.h	5827	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18697	0644	edit dl rm
cc_platform.h	3140	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9193	0644	edit dl rm
cfag12864b.h	1499	0644	edit dl rm
cgroup-defs.h	27242	0644	edit dl rm
cgroup.h	28880	0644	edit dl rm
cgroup_rdma.h	1358	0644	edit dl rm
cgroup_subsys.h	1259	0644	edit dl rm
circ_buf.h	1120	0644	edit dl rm
cleancache.h	3982	0644	edit dl rm
cleanup.h	14215	0644	edit dl rm
clk-provider.h	37542	0644	edit dl rm
clk.h	25157	0644	edit dl rm
clkdev.h	1698	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	9188	0644	edit dl rm
clock_cooling.h	2106	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	1212	0644	edit dl rm
cmdline-parser.h	1238	0644	edit dl rm
cnt32_to_63.h	3691	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2244	0644	edit dl rm
coda_psdev.h	2692	0644	edit dl rm
compaction.h	7654	0644	edit dl rm
compat.h	35739	0644	edit dl rm
compat_time.h	499	0644	edit dl rm
compiler-clang.h	2446	0644	edit dl rm
compiler-gcc.h	5756	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler.h	15718	0644	edit dl rm
compiler_attributes.h	10600	0644	edit dl rm
compiler_types.h	6931	0644	edit dl rm
completion.h	4201	0644	edit dl rm
component.h	4459	0644	edit dl rm
concap.h	3778	0644	edit dl rm
configfs.h	9441	0644	edit dl rm
connector.h	2490	0644	edit dl rm
console.h	7504	0644	edit dl rm
consolemap.h	1068	0644	edit dl rm
console_struct.h	6966	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	668	0644	edit dl rm
container_of.h	1278	0644	edit dl rm
context_tracking.h	5168	0644	edit dl rm
context_tracking_state.h	1529	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	1794	0644	edit dl rm
coredump.h	797	0644	edit dl rm
coresight-pmu.h	989	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	9676	0644	edit dl rm
counter.h	15497	0644	edit dl rm
counter_enum.h	1463	0644	edit dl rm
count_zeros.h	1660	0644	edit dl rm
cper.h	16826	0644	edit dl rm
cpu.h	7959	0644	edit dl rm
cpufeature.h	1882	0644	edit dl rm
cpufreq.h	34248	0644	edit dl rm
cpuhotplug.h	14269	0644	edit dl rm
cpuidle.h	13061	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	29721	0644	edit dl rm
cpuset.h	8297	0644	edit dl rm
cpu_cooling.h	2389	0644	edit dl rm
cpu_pm.h	2850	0644	edit dl rm
cpu_rmap.h	1902	0644	edit dl rm
crash_core.h	3292	0644	edit dl rm
crash_dump.h	5193	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	613	0644	edit dl rm
crc-t10dif.h	453	0644	edit dl rm
crc4.h	192	0644	edit dl rm
crc7.h	316	0644	edit dl rm
crc8.h	3747	0644	edit dl rm
crc16.h	622	0644	edit dl rm
crc32.h	2894	0644	edit dl rm
crc32c.h	331	0644	edit dl rm
crc32poly.h	610	0644	edit dl rm
cred.h	12749	0644	edit dl rm
crypto.h	59393	0644	edit dl rm
cryptohash.h	546	0644	edit dl rm
cs5535.h	6426	0644	edit dl rm
ctype.h	1791	0644	edit dl rm
cuda.h	501	0644	edit dl rm
cxl_err.h	468	0644	edit dl rm
cyclades.h	10607	0644	edit dl rm
damon.h	19616	0644	edit dl rm
davinci_emac.h	1150	0644	edit dl rm
dax.h	7553	0644	edit dl rm
dca.h	2698	0644	edit dl rm
dcache.h	19621	0644	edit dl rm
dccp.h	10989	0644	edit dl rm
dcookies.h	1329	0644	edit dl rm
debugfs.h	11921	0644	edit dl rm
debugobjects.h	3988	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2335	0644	edit dl rm
delayacct.h	6285	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
dell-led.h	128	0644	edit dl rm
devcoredump.h	2849	0644	edit dl rm
devfreq-event.h	5778	0644	edit dl rm
devfreq.h	12987	0644	edit dl rm
devfreq_cooling.h	3608	0644	edit dl rm
device-mapper.h	19529	0644	edit dl rm
device.h	67275	0644	edit dl rm
device_cgroup.h	1680	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1314	0644	edit dl rm
dev_printk.h	7731	0644	edit dl rm
digsig.h	1379	0644	edit dl rm
dim.h	8951	0644	edit dl rm
dio.h	11229	0644	edit dl rm
dirent.h	216	0644	edit dl rm
dlm.h	7240	0644	edit dl rm
dlm_plock.h	678	0644	edit dl rm
dm-bufio.h	4574	0644	edit dl rm
dm-dirty-log.h	4038	0644	edit dl rm
dm-io.h	1980	0644	edit dl rm
dm-kcopyd.h	3013	0644	edit dl rm
dm-region-hash.h	3182	0644	edit dl rm
dm9000.h	1136	0644	edit dl rm
dma-buf.h	21547	0644	edit dl rm
dma-contiguous.h	5070	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2983	0644	edit dl rm
dma-fence-chain.h	3576	0644	edit dl rm
dma-fence-unwrap.h	2298	0644	edit dl rm
dma-fence.h	21162	0644	edit dl rm
dma-iommu.h	3020	0644	edit dl rm
dma-map-ops.h	10863	0644	edit dl rm
dma-mapping.h	23170	0644	edit dl rm
dma-resv.h	17245	0644	edit dl rm
dmaengine.h	54891	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	8791	0644	edit dl rm
dmi.h	4375	0644	edit dl rm
dnotify.h	1047	0644	edit dl rm
dns_resolver.h	1339	0644	edit dl rm
dqblk_qtree.h	2238	0644	edit dl rm
dqblk_v1.h	327	0644	edit dl rm
dqblk_v2.h	406	0644	edit dl rm
drbd.h	10923	0644	edit dl rm
drbd_genl.h	22010	0644	edit dl rm
drbd_genl_api.h	1808	0644	edit dl rm
drbd_limits.h	8003	0644	edit dl rm
ds2782_battery.h	158	0644	edit dl rm
dtlk.h	3584	0644	edit dl rm
dw_apb_timer.h	1743	0644	edit dl rm
dynamic_debug.h	5831	0644	edit dl rm
dynamic_queue_limits.h	3812	0644	edit dl rm
earlycpio.h	359	0644	edit dl rm
ecryptfs.h	3915	0644	edit dl rm
edac.h	20718	0644	edit dl rm
edd.h	1469	0644	edit dl rm
edma.h	807	0644	edit dl rm
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eeprom_93xx46.h	776	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	62813	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	6059	0644	edit dl rm
elf-fdpic.h	2237	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	1565	0644	edit dl rm
elfcore-compat.h	1267	0644	edit dl rm
elfcore.h	2160	0644	edit dl rm
elfnote.h	3625	0644	edit dl rm
enclosure.h	4711	0644	edit dl rm
energy_model.h	5994	0644	edit dl rm
err.h	1583	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1424	0644	edit dl rm
error-injection.h	607	0644	edit dl rm
errqueue.h	524	0644	edit dl rm
errseq.h	382	0644	edit dl rm
etherdevice.h	16917	0644	edit dl rm
ethtool.h	35580	0644	edit dl rm
ethtool_netlink.h	1920	0644	edit dl rm
eventfd.h	2167	0644	edit dl rm
eventpoll.h	2457	0644	edit dl rm
evm.h	2985	0644	edit dl rm
export.h	3697	0644	edit dl rm
exportfs.h	7692	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	4431	0644	edit dl rm
extcon.h	10270	0644	edit dl rm
f2fs_fs.h	18526	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1719	0644	edit dl rm
fanotify.h	2336	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28712	0644	edit dl rm
fbcon.h	2136	0644	edit dl rm
fcdevice.h	988	0644	edit dl rm
fcntl.h	1808	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	1044	0644	edit dl rm
fdtable.h	3616	0644	edit dl rm
fec.h	609	0644	edit dl rm
file.h	3147	0644	edit dl rm
filter.h	42781	0644	edit dl rm
fips.h	167	0644	edit dl rm
firewire.h	13868	0644	edit dl rm
firmware-map.h	1351	0644	edit dl rm
firmware.h	5874	0644	edit dl rm
fixp-arith.h	4516	0644	edit dl rm
flat.h	1653	0644	edit dl rm
flex_array.h	4412	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
fmc-sdb.h	1319	0644	edit dl rm
fmc.h	9877	0644	edit dl rm
font.h	1598	0644	edit dl rm
fortify-string.h	16550	0644	edit dl rm
freezer.h	9257	0644	edit dl rm
frontswap.h	3121	0644	edit dl rm
fs.h	118914	0644	edit dl rm
fscache-cache.h	19254	0644	edit dl rm
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fsi.h	2424	0644	edit dl rm
fsl-diu-fb.h	4179	0644	edit dl rm
fsldma.h	398	0644	edit dl rm
fsl_devices.h	4430	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25658	0644	edit dl rm
fsnotify.h	7796	0644	edit dl rm
fsnotify_backend.h	20665	0644	edit dl rm
fs_context.h	9097	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4750	0644	edit dl rm
fs_pin.h	619	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1751	0644	edit dl rm
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gcd.h	193	0644	edit dl rm
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genetlink.h	1379	0644	edit dl rm
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getcpu.h	641	0644	edit dl rm
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goldfish.h	605	0644	edit dl rm
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gpio.h	5478	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
hardirq.h	3264	0644	edit dl rm
hash.h	2998	0644	edit dl rm
hashtable.h	6805	0644	edit dl rm
hdlc.h	3413	0644	edit dl rm
hdlcdrv.h	6470	0644	edit dl rm
hdmi.h	12851	0644	edit dl rm
hid-debug.h	1458	0644	edit dl rm
hid-roccat.h	484	0644	edit dl rm
hid-sensor-hub.h	9190	0644	edit dl rm
hid-sensor-ids.h	7617	0644	edit dl rm
hid.h	38339	0644	edit dl rm
hidden.h	966	0644	edit dl rm
hiddev.h	1458	0644	edit dl rm
hidraw.h	1146	0644	edit dl rm
highmem-internal.h	4952	0644	edit dl rm
highmem.h	8235	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5249	0644	edit dl rm
hippidevice.h	1263	0644	edit dl rm
hmm.h	4656	0644	edit dl rm
host1x.h	8618	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16651	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	27496	0644	edit dl rm
hugetlb_cgroup.h	7056	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
huge_mm.h	15743	0644	edit dl rm
hwmon-sysfs.h	2024	0644	edit dl rm
hwmon-vid.h	1518	0644	edit dl rm
hwmon.h	14084	0644	edit dl rm
hwspinlock.h	13044	0644	edit dl rm
hw_breakpoint.h	4405	0644	edit dl rm
hw_random.h	2377	0644	edit dl rm
hyperv.h	50010	0644	edit dl rm
hypervisor.h	748	0644	edit dl rm
i2c-algo-bit.h	2322	0644	edit dl rm
i2c-algo-pca.h	2599	0644	edit dl rm
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Edit: /usr/src/kernels/4.18.0-553.157.1.el8_10.x86_64/include/linux/seqlock.h (39244B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_SEQLOCK_H
#define __LINUX_SEQLOCK_H

/*
 * seqcount_t / seqlock_t - a reader-writer consistency mechanism with
 * lockless readers (read-only retry loops), and no writer starvation.
 *
 * See Documentation/locking/seqlock.rst
 *
 * Copyrights:
 * - Based on x86_64 vsyscall gettimeofday: Keith Owens, Andrea Arcangeli
 * - Sequence counters with associated locks, (C) 2020 Linutronix GmbH
 */

#include <linux/compiler.h>
#include <linux/kcsan-checks.h>
#include <linux/lockdep.h>
#include <linux/mutex.h>
#include <linux/ww_mutex.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>

#include <asm/processor.h>

/*
 * The seqlock seqcount_t interface does not prescribe a precise sequence of
 * read begin/retry/end. For readers, typically there is a call to
 * read_seqcount_begin() and read_seqcount_retry(), however, there are more
 * esoteric cases which do not follow this pattern.
 *
 * As a consequence, we take the following best-effort approach for raw usage
 * via seqcount_t under KCSAN: upon beginning a seq-reader critical section,
 * pessimistically mark the next KCSAN_SEQLOCK_REGION_MAX memory accesses as
 * atomics; if there is a matching read_seqcount_retry() call, no following
 * memory operations are considered atomic. Usage of the seqlock_t interface
 * is not affected.
 */
#define KCSAN_SEQLOCK_REGION_MAX 1000

/*
 * Sequence counters (seqcount_t)
 *
 * This is the raw counting mechanism, without any writer protection.
 *
 * Write side critical sections must be serialized and non-preemptible.
 *
 * If readers can be invoked from hardirq or softirq contexts,
 * interrupts or bottom halves must also be respectively disabled before
 * entering the write section.
 *
 * This mechanism can't be used if the protected data contains pointers,
 * as the writer can invalidate a pointer that a reader is following.
 *
 * If the write serialization mechanism is one of the common kernel
 * locking primitives, use a sequence counter with associated lock
 * (seqcount_LOCKNAME_t) instead.
 *
 * If it's desired to automatically handle the sequence counter writer
 * serialization and non-preemptibility requirements, use a sequential
 * lock (seqlock_t) instead.
 *
 * See Documentation/locking/seqlock.rst
 */
typedef struct seqcount {
	unsigned sequence;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map dep_map;
#endif
} seqcount_t;

static inline void __seqcount_init(seqcount_t *s, const char *name,
					  struct lock_class_key *key)
{
	/*
	 * Make sure we are not reinitializing a held lock:
	 */
	lockdep_init_map(&s->dep_map, name, key, 0);
	s->sequence = 0;
}

#ifdef CONFIG_DEBUG_LOCK_ALLOC

# define SEQCOUNT_DEP_MAP_INIT(lockname)				\
		.dep_map = { .name = #lockname }

/**
 * seqcount_init() - runtime initializer for seqcount_t
 * @s: Pointer to the seqcount_t instance
 */
# define seqcount_init(s)						\
	do {								\
		static struct lock_class_key __key;			\
		__seqcount_init((s), #s, &__key);			\
	} while (0)

static inline void seqcount_lockdep_reader_access(const seqcount_t *s)
{
	seqcount_t *l = (seqcount_t *)s;
	unsigned long flags;

local_irq_save(flags);
	seqcount_acquire_read(&l->dep_map, 0, 0, _RET_IP_);
	seqcount_release(&l->dep_map, _RET_IP_);
	local_irq_restore(flags);
}

#else
# define SEQCOUNT_DEP_MAP_INIT(lockname)
# define seqcount_init(s) __seqcount_init(s, NULL, NULL)
# define seqcount_lockdep_reader_access(x)
#endif

/**
 * SEQCNT_ZERO() - static initializer for seqcount_t
 * @name: Name of the seqcount_t instance
 */
#define SEQCNT_ZERO(name) { .sequence = 0, SEQCOUNT_DEP_MAP_INIT(name) }

/*
 * Sequence counters with associated locks (seqcount_LOCKNAME_t)
 *
 * A sequence counter which associates the lock used for writer
 * serialization at initialization time. This enables lockdep to validate
 * that the write side critical section is properly serialized.
 *
 * For associated locks which do not implicitly disable preemption,
 * preemption protection is enforced in the write side function.
 *
 * Lockdep is never used in any for the raw write variants.
 *
 * See Documentation/locking/seqlock.rst
 */

/*
 * For PREEMPT_RT, seqcount_LOCKNAME_t write side critical sections cannot
 * disable preemption. It can lead to higher latencies, and the write side
 * sections will not be able to acquire locks which become sleeping locks
 * (e.g. spinlock_t).
 *
 * To remain preemptible while avoiding a possible livelock caused by the
 * reader preempting the writer, use a different technique: let the reader
 * detect if a seqcount_LOCKNAME_t writer is in progress. If that is the
 * case, acquire then release the associated LOCKNAME writer serialization
 * lock. This will allow any possibly-preempted writer to make progress
 * until the end of its writer serialization lock critical section.
 *
 * This lock-unlock technique must be implemented for all of PREEMPT_RT
 * sleeping locks.  See Documentation/locking/locktypes.rst
 */
#if defined(CONFIG_LOCKDEP) || defined(CONFIG_PREEMPT_RT)
#define __SEQ_LOCK(expr)	expr
#else
#define __SEQ_LOCK(expr)
#endif

/*
 * typedef seqcount_LOCKNAME_t - sequence counter with LOCKNAME associated
 * @seqcount:	The real sequence counter
 * @lock:	Pointer to the associated lock
 *
 * A plain sequence counter with external writer synchronization by
 * LOCKNAME @lock. The lock is associated to the sequence counter in the
 * static initializer or init function. This enables lockdep to validate
 * that the write side critical section is properly serialized.
 *
 * LOCKNAME:	raw_spinlock, spinlock, rwlock, mutex, or ww_mutex.
 */

/*
 * seqcount_LOCKNAME_init() - runtime initializer for seqcount_LOCKNAME_t
 * @s:		Pointer to the seqcount_LOCKNAME_t instance
 * @lock:	Pointer to the associated lock
 */

#define seqcount_LOCKNAME_init(s, _lock, lockname)			\
	do {								\
		seqcount_##lockname##_t *____s = (s);			\
		seqcount_init(&____s->seqcount);			\
		__SEQ_LOCK(____s->lock = (_lock));			\
	} while (0)

#define seqcount_raw_spinlock_init(s, lock)	seqcount_LOCKNAME_init(s, lock, raw_spinlock)
#define seqcount_spinlock_init(s, lock)		seqcount_LOCKNAME_init(s, lock, spinlock)
#define seqcount_rwlock_init(s, lock)		seqcount_LOCKNAME_init(s, lock, rwlock)
#define seqcount_mutex_init(s, lock)		seqcount_LOCKNAME_init(s, lock, mutex)
#define seqcount_ww_mutex_init(s, lock)		seqcount_LOCKNAME_init(s, lock, ww_mutex)

/*
 * SEQCOUNT_LOCKNAME()	- Instantiate seqcount_LOCKNAME_t and helpers
 * seqprop_LOCKNAME_*()	- Property accessors for seqcount_LOCKNAME_t
 *
 * @lockname:		"LOCKNAME" part of seqcount_LOCKNAME_t
 * @locktype:		LOCKNAME canonical C data type
 * @preemptible:	preemptibility of above locktype
 * @lockmember:		argument for lockdep_assert_held()
 * @lockbase:		associated lock release function (prefix only)
 * @lock_acquire:	associated lock acquisition function (full call)
 */
#define SEQCOUNT_LOCKNAME(lockname, locktype, preemptible, lockmember, lockbase, lock_acquire) \
typedef struct seqcount_##lockname {					\
	seqcount_t		seqcount;				\
	__SEQ_LOCK(locktype	*lock);					\
} seqcount_##lockname##_t;						\
									\
static __always_inline seqcount_t *					\
__seqprop_##lockname##_ptr(seqcount_##lockname##_t *s)			\
{									\
	return &s->seqcount;						\
}									\
									\
static __always_inline unsigned						\
__seqprop_##lockname##_sequence(const seqcount_##lockname##_t *s)	\
{									\
	unsigned seq = READ_ONCE(s->seqcount.sequence);			\
									\
	if (!IS_ENABLED(CONFIG_PREEMPT_RT))				\
		return seq;						\
									\
	if (preemptible && unlikely(seq & 1)) {				\
		__SEQ_LOCK(lock_acquire);				\
		__SEQ_LOCK(lockbase##_unlock(s->lock));			\
									\
		/*							\
		 * Re-read the sequence counter since the (possibly	\
		 * preempted) writer made progress.			\
		 */							\
		seq = READ_ONCE(s->seqcount.sequence);			\
	}								\
									\
	return seq;							\
}									\
									\
static __always_inline bool						\
__seqprop_##lockname##_preemptible(const seqcount_##lockname##_t *s)	\
{									\
	if (!IS_ENABLED(CONFIG_PREEMPT_RT))				\
		return preemptible;					\
									\
	/* PREEMPT_RT relies on the above LOCK+UNLOCK */		\
	return false;							\
}									\
									\
static __always_inline void						\
__seqprop_##lockname##_assert(const seqcount_##lockname##_t *s)		\
{									\
	__SEQ_LOCK(lockdep_assert_held(lockmember));			\
}

/*
 * __seqprop() for seqcount_t
 */

static inline seqcount_t *__seqprop_ptr(seqcount_t *s)
{
	return s;
}

static inline unsigned __seqprop_sequence(const seqcount_t *s)
{
	return READ_ONCE(s->sequence);
}

static inline bool __seqprop_preemptible(const seqcount_t *s)
{
	return false;
}

static inline void __seqprop_assert(const seqcount_t *s)
{
	lockdep_assert_preemption_disabled();
}

#define __SEQ_RT	IS_ENABLED(CONFIG_PREEMPT_RT)

SEQCOUNT_LOCKNAME(raw_spinlock, raw_spinlock_t,  false,    s->lock,        raw_spin, raw_spin_lock(s->lock))
SEQCOUNT_LOCKNAME(spinlock,     spinlock_t,      __SEQ_RT, s->lock,        spin,     spin_lock(s->lock))
SEQCOUNT_LOCKNAME(rwlock,       rwlock_t,        __SEQ_RT, s->lock,        read,     read_lock(s->lock))
SEQCOUNT_LOCKNAME(mutex,        struct mutex,    true,     s->lock,        mutex,    mutex_lock(s->lock))
SEQCOUNT_LOCKNAME(ww_mutex,     struct ww_mutex, true,     &s->lock->base, ww_mutex, ww_mutex_lock(s->lock, NULL))

/*
 * SEQCNT_LOCKNAME_ZERO - static initializer for seqcount_LOCKNAME_t
 * @name:	Name of the seqcount_LOCKNAME_t instance
 * @lock:	Pointer to the associated LOCKNAME
 */

#define SEQCOUNT_LOCKNAME_ZERO(seq_name, assoc_lock) {			\
	.seqcount		= SEQCNT_ZERO(seq_name.seqcount),	\
	__SEQ_LOCK(.lock	= (assoc_lock))				\
}

#define SEQCNT_RAW_SPINLOCK_ZERO(name, lock)	SEQCOUNT_LOCKNAME_ZERO(name, lock)
#define SEQCNT_SPINLOCK_ZERO(name, lock)	SEQCOUNT_LOCKNAME_ZERO(name, lock)
#define SEQCNT_RWLOCK_ZERO(name, lock)		SEQCOUNT_LOCKNAME_ZERO(name, lock)
#define SEQCNT_MUTEX_ZERO(name, lock)		SEQCOUNT_LOCKNAME_ZERO(name, lock)
#define SEQCNT_WW_MUTEX_ZERO(name, lock) 	SEQCOUNT_LOCKNAME_ZERO(name, lock)

#define __seqprop_case(s, lockname, prop)				\
	seqcount_##lockname##_t: __seqprop_##lockname##_##prop((void *)(s))

#define __seqprop(s, prop) _Generic(*(s),				\
	seqcount_t:		__seqprop_##prop((void *)(s)),		\
	__seqprop_case((s),	raw_spinlock,	prop),			\
	__seqprop_case((s),	spinlock,	prop),			\
	__seqprop_case((s),	rwlock,		prop),			\
	__seqprop_case((s),	mutex,		prop),			\
	__seqprop_case((s),	ww_mutex,	prop))

#define seqprop_ptr(s)			__seqprop(s, ptr)
#define seqprop_sequence(s)		__seqprop(s, sequence)
#define seqprop_preemptible(s)		__seqprop(s, preemptible)
#define seqprop_assert(s)		__seqprop(s, assert)

/**
 * __read_seqcount_begin() - begin a seqcount_t read section w/o barrier
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * __read_seqcount_begin is like read_seqcount_begin, but has no smp_rmb()
 * barrier. Callers should ensure that smp_rmb() or equivalent ordering is
 * provided before actually loading any of the variables that are to be
 * protected in this critical section.
 *
 * Use carefully, only in critical code, and comment how the barrier is
 * provided.
 *
 * Return: count to be passed to read_seqcount_retry()
 */
#define __read_seqcount_begin(s)					\
({									\
	unsigned __seq;							\
									\
	while ((__seq = seqprop_sequence(s)) & 1)			\
		cpu_relax();						\
									\
	kcsan_atomic_next(KCSAN_SEQLOCK_REGION_MAX);			\
	__seq;								\
})

/**
 * raw_read_seqcount_begin() - begin a seqcount_t read section w/o lockdep
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * Return: count to be passed to read_seqcount_retry()
 */
#define raw_read_seqcount_begin(s)					\
({									\
	unsigned _seq = __read_seqcount_begin(s);			\
									\
	smp_rmb();							\
	_seq;								\
})

/**
 * read_seqcount_begin() - begin a seqcount_t read critical section
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * Return: count to be passed to read_seqcount_retry()
 */
#define read_seqcount_begin(s)						\
({									\
	seqcount_lockdep_reader_access(seqprop_ptr(s));			\
	raw_read_seqcount_begin(s);					\
})

/**
 * raw_read_seqcount() - read the raw seqcount_t counter value
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * raw_read_seqcount opens a read critical section of the given
 * seqcount_t, without any lockdep checking, and without checking or
 * masking the sequence counter LSB. Calling code is responsible for
 * handling that.
 *
 * Return: count to be passed to read_seqcount_retry()
 */
#define raw_read_seqcount(s)						\
({									\
	unsigned __seq = seqprop_sequence(s);				\
									\
	smp_rmb();							\
	kcsan_atomic_next(KCSAN_SEQLOCK_REGION_MAX);			\
	__seq;								\
})

/**
 * raw_seqcount_begin() - begin a seqcount_t read critical section w/o
 *                        lockdep and w/o counter stabilization
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * raw_seqcount_begin opens a read critical section of the given
 * seqcount_t. Unlike read_seqcount_begin(), this function will not wait
 * for the count to stabilize. If a writer is active when it begins, it
 * will fail the read_seqcount_retry() at the end of the read critical
 * section instead of stabilizing at the beginning of it.
 *
 * Use this only in special kernel hot paths where the read section is
 * small and has a high probability of success through other external
 * means. It will save a single branching instruction.
 *
 * Return: count to be passed to read_seqcount_retry()
 */
#define raw_seqcount_begin(s)						\
({									\
	/*								\
	 * If the counter is odd, let read_seqcount_retry() fail	\
	 * by decrementing the counter.					\
	 */								\
	raw_read_seqcount(s) & ~1;					\
})

/**
 * __read_seqcount_retry() - end a seqcount_t read section w/o barrier
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 * @start: count, from read_seqcount_begin()
 *
 * __read_seqcount_retry is like read_seqcount_retry, but has no smp_rmb()
 * barrier. Callers should ensure that smp_rmb() or equivalent ordering is
 * provided before actually loading any of the variables that are to be
 * protected in this critical section.
 *
 * Use carefully, only in critical code, and comment how the barrier is
 * provided.
 *
 * Return: true if a read section retry is required, else false
 */
#define __read_seqcount_retry(s, start)					\
	do___read_seqcount_retry(seqprop_ptr(s), start)

static inline int do___read_seqcount_retry(const seqcount_t *s, unsigned start)
{
	kcsan_atomic_next(0);
	return unlikely(READ_ONCE(s->sequence) != start);
}

/**
 * read_seqcount_retry() - end a seqcount_t read critical section
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 * @start: count, from read_seqcount_begin()
 *
 * read_seqcount_retry closes the read critical section of given
 * seqcount_t.  If the critical section was invalid, it must be ignored
 * (and typically retried).
 *
 * Return: true if a read section retry is required, else false
 */
#define read_seqcount_retry(s, start)					\
	do_read_seqcount_retry(seqprop_ptr(s), start)

static inline int do_read_seqcount_retry(const seqcount_t *s, unsigned start)
{
	smp_rmb();
	return do___read_seqcount_retry(s, start);
}

/**
 * raw_write_seqcount_begin() - start a seqcount_t write section w/o lockdep
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * Context: check write_seqcount_begin()
 */
#define raw_write_seqcount_begin(s)					\
do {									\
	if (seqprop_preemptible(s))					\
		preempt_disable();					\
									\
	do_raw_write_seqcount_begin(seqprop_ptr(s));			\
} while (0)

static inline void do_raw_write_seqcount_begin(seqcount_t *s)
{
	kcsan_nestable_atomic_begin();
	s->sequence++;
	smp_wmb();
}

/**
 * raw_write_seqcount_end() - end a seqcount_t write section w/o lockdep
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * Context: check write_seqcount_end()
 */
#define raw_write_seqcount_end(s)					\
do {									\
	do_raw_write_seqcount_end(seqprop_ptr(s));			\
									\
	if (seqprop_preemptible(s))					\
		preempt_enable();					\
} while (0)

static inline void do_raw_write_seqcount_end(seqcount_t *s)
{
	smp_wmb();
	s->sequence++;
	kcsan_nestable_atomic_end();
}

/**
 * write_seqcount_begin_nested() - start a seqcount_t write section with
 *                                 custom lockdep nesting level
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 * @subclass: lockdep nesting level
 *
 * See Documentation/locking/lockdep-design.rst
 * Context: check write_seqcount_begin()
 */
#define write_seqcount_begin_nested(s, subclass)			\
do {									\
	seqprop_assert(s);						\
									\
	if (seqprop_preemptible(s))					\
		preempt_disable();					\
									\
	do_write_seqcount_begin_nested(seqprop_ptr(s), subclass);	\
} while (0)

static inline void do_write_seqcount_begin_nested(seqcount_t *s, int subclass)
{
	do_raw_write_seqcount_begin(s);
	seqcount_acquire(&s->dep_map, subclass, 0, _RET_IP_);
}

/**
 * write_seqcount_begin() - start a seqcount_t write side critical section
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * Context: sequence counter write side sections must be serialized and
 * non-preemptible. Preemption will be automatically disabled if and
 * only if the seqcount write serialization lock is associated, and
 * preemptible.  If readers can be invoked from hardirq or softirq
 * context, interrupts or bottom halves must be respectively disabled.
 */
#define write_seqcount_begin(s)						\
do {									\
	seqprop_assert(s);						\
									\
	if (seqprop_preemptible(s))					\
		preempt_disable();					\
									\
	do_write_seqcount_begin(seqprop_ptr(s));			\
} while (0)

static inline void do_write_seqcount_begin(seqcount_t *s)
{
	do_write_seqcount_begin_nested(s, 0);
}

/**
 * write_seqcount_end() - end a seqcount_t write side critical section
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * Context: Preemption will be automatically re-enabled if and only if
 * the seqcount write serialization lock is associated, and preemptible.
 */
#define write_seqcount_end(s)						\
do {									\
	do_write_seqcount_end(seqprop_ptr(s));				\
									\
	if (seqprop_preemptible(s))					\
		preempt_enable();					\
} while (0)

static inline void do_write_seqcount_end(seqcount_t *s)
{
	seqcount_release(&s->dep_map, _RET_IP_);
	do_raw_write_seqcount_end(s);
}

/**
 * raw_write_seqcount_barrier() - do a seqcount_t write barrier
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * This can be used to provide an ordering guarantee instead of the usual
 * consistency guarantee. It is one wmb cheaper, because it can collapse
 * the two back-to-back wmb()s.
 *
 * Note that writes surrounding the barrier should be declared atomic (e.g.
 * via WRITE_ONCE): a) to ensure the writes become visible to other threads
 * atomically, avoiding compiler optimizations; b) to document which writes are
 * meant to propagate to the reader critical section. This is necessary because
 * neither writes before and after the barrier are enclosed in a seq-writer
 * critical section that would ensure readers are aware of ongoing writes::
 *
 *	seqcount_t seq;
 *	bool X = true, Y = false;
 *
 *	void read(void)
 *	{
 *		bool x, y;
 *
 *		do {
 *			int s = read_seqcount_begin(&seq);
 *
 *			x = X; y = Y;
 *
 *		} while (read_seqcount_retry(&seq, s));
 *
 *		BUG_ON(!x && !y);
 *      }
 *
 *      void write(void)
 *      {
 *		WRITE_ONCE(Y, true);
 *
 *		raw_write_seqcount_barrier(seq);
 *
 *		WRITE_ONCE(X, false);
 *      }
 */
#define raw_write_seqcount_barrier(s)					\
	do_raw_write_seqcount_barrier(seqprop_ptr(s))

static inline void do_raw_write_seqcount_barrier(seqcount_t *s)
{
	kcsan_nestable_atomic_begin();
	s->sequence++;
	smp_wmb();
	s->sequence++;
	kcsan_nestable_atomic_end();
}

/**
 * write_seqcount_invalidate() - invalidate in-progress seqcount_t read
 *                               side operations
 * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
 *
 * After write_seqcount_invalidate, no seqcount_t read side operations
 * will complete successfully and see data older than this.
 */
#define write_seqcount_invalidate(s)					\
	do_write_seqcount_invalidate(seqprop_ptr(s))

static inline void do_write_seqcount_invalidate(seqcount_t *s)
{
	smp_wmb();
	kcsan_nestable_atomic_begin();
	s->sequence+=2;
	kcsan_nestable_atomic_end();
}

/*
 * Latch sequence counters (seqcount_latch_t)
 *
 * A sequence counter variant where the counter even/odd value is used to
 * switch between two copies of protected data. This allows the read path,
 * typically NMIs, to safely interrupt the write side critical section.
 *
 * As the write sections are fully preemptible, no special handling for
 * PREEMPT_RT is needed.
 */
typedef struct {
	seqcount_t seqcount;
} seqcount_latch_t;

/**
 * SEQCNT_LATCH_ZERO() - static initializer for seqcount_latch_t
 * @seq_name: Name of the seqcount_latch_t instance
 */
#define SEQCNT_LATCH_ZERO(seq_name) {					\
	.seqcount		= SEQCNT_ZERO(seq_name.seqcount),	\
}

/**
 * seqcount_latch_init() - runtime initializer for seqcount_latch_t
 * @s: Pointer to the seqcount_latch_t instance
 */
#define seqcount_latch_init(s) seqcount_init(&(s)->seqcount)

/**
 * raw_read_seqcount_latch() - pick even/odd latch data copy
 * @s: Pointer to seqcount_latch_t
 *
 * See raw_write_seqcount_latch() for details and a full reader/writer
 * usage example.
 *
 * Return: sequence counter raw value. Use the lowest bit as an index for
 * picking which data copy to read. The full counter must then be checked
 * with read_seqcount_latch_retry().
 */
static inline unsigned raw_read_seqcount_latch(const seqcount_latch_t *s)
{
	/*
	 * Pairs with the first smp_wmb() in raw_write_seqcount_latch().
	 * Due to the dependent load, a full smp_rmb() is not needed.
	 */
	return READ_ONCE(s->seqcount.sequence);
}

/**
 * read_seqcount_latch_retry() - end a seqcount_latch_t read section
 * @s:		Pointer to seqcount_latch_t
 * @start:	count, from raw_read_seqcount_latch()
 *
 * Return: true if a read section retry is required, else false
 */
static inline int
read_seqcount_latch_retry(const seqcount_latch_t *s, unsigned start)
{
	return read_seqcount_retry(&s->seqcount, start);
}

/**
 * raw_write_seqcount_latch() - redirect latch readers to even/odd copy
 * @s: Pointer to seqcount_latch_t
 *
 * The latch technique is a multiversion concurrency control method that allows
 * queries during non-atomic modifications. If you can guarantee queries never
 * interrupt the modification -- e.g. the concurrency is strictly between CPUs
 * -- you most likely do not need this.
 *
 * Where the traditional RCU/lockless data structures rely on atomic
 * modifications to ensure queries observe either the old or the new state the
 * latch allows the same for non-atomic updates. The trade-off is doubling the
 * cost of storage; we have to maintain two copies of the entire data
 * structure.
 *
 * Very simply put: we first modify one copy and then the other. This ensures
 * there is always one copy in a stable state, ready to give us an answer.
 *
 * The basic form is a data structure like::
 *
 *	struct latch_struct {
 *		seqcount_latch_t	seq;
 *		struct data_struct	data[2];
 *	};
 *
 * Where a modification, which is assumed to be externally serialized, does the
 * following::
 *
 *	void latch_modify(struct latch_struct *latch, ...)
 *	{
 *		smp_wmb();	// Ensure that the last data[1] update is visible
 *		latch->seq.sequence++;
 *		smp_wmb();	// Ensure that the seqcount update is visible
 *
 *		modify(latch->data[0], ...);
 *
 *		smp_wmb();	// Ensure that the data[0] update is visible
 *		latch->seq.sequence++;
 *		smp_wmb();	// Ensure that the seqcount update is visible
 *
 *		modify(latch->data[1], ...);
 *	}
 *
 * The query will have a form like::
 *
 *	struct entry *latch_query(struct latch_struct *latch, ...)
 *	{
 *		struct entry *entry;
 *		unsigned seq, idx;
 *
 *		do {
 *			seq = raw_read_seqcount_latch(&latch->seq);
 *
 *			idx = seq & 0x01;
 *			entry = data_query(latch->data[idx], ...);
 *
 *		// This includes needed smp_rmb()
 *		} while (read_seqcount_latch_retry(&latch->seq, seq));
 *
 *		return entry;
 *	}
 *
 * So during the modification, queries are first redirected to data[1]. Then we
 * modify data[0]. When that is complete, we redirect queries back to data[0]
 * and we can modify data[1].
 *
 * NOTE:
 *
 *	The non-requirement for atomic modifications does _NOT_ include
 *	the publishing of new entries in the case where data is a dynamic
 *	data structure.
 *
 *	An iteration might start in data[0] and get suspended long enough
 *	to miss an entire modification sequence, once it resumes it might
 *	observe the new entry.
 *
 * NOTE2:
 *
 *	When data is a dynamic data structure; one should use regular RCU
 *	patterns to manage the lifetimes of the objects within.
 */
static inline void raw_write_seqcount_latch(seqcount_latch_t *s)
{
	smp_wmb();	/* prior stores before incrementing "sequence" */
	s->seqcount.sequence++;
	smp_wmb();      /* increment "sequence" before following stores */
}

/*
 * Sequential locks (seqlock_t)
 *
 * Sequence counters with an embedded spinlock for writer serialization
 * and non-preemptibility.
 *
 * For more info, see:
 *    - Comments on top of seqcount_t
 *    - Documentation/locking/seqlock.rst
 */
typedef struct {
	/*
	 * Make sure that readers don't starve writers on PREEMPT_RT: use
	 * seqcount_spinlock_t instead of seqcount_t. Check __SEQ_LOCK().
	 */
#if defined(CONFIG_LOCKDEP) || defined(CONFIG_PREEMPT_RT)
	seqcount_spinlock_t seqcount;
#else
	RH_KABI_REPLACE(struct seqcount seqcount, seqcount_spinlock_t seqcount)
#endif
	spinlock_t lock;
} seqlock_t;

#define __SEQLOCK_UNLOCKED(lockname)					\
	{								\
		.seqcount = SEQCNT_SPINLOCK_ZERO(lockname, &(lockname).lock), \
		.lock =	__SPIN_LOCK_UNLOCKED(lockname)			\
	}

/**
 * seqlock_init() - dynamic initializer for seqlock_t
 * @sl: Pointer to the seqlock_t instance
 */
#define seqlock_init(sl)						\
	do {								\
		spin_lock_init(&(sl)->lock);				\
		seqcount_spinlock_init(&(sl)->seqcount, &(sl)->lock);	\
	} while (0)

/**
 * DEFINE_SEQLOCK(sl) - Define a statically allocated seqlock_t
 * @sl: Name of the seqlock_t instance
 */
#define DEFINE_SEQLOCK(sl) \
		seqlock_t sl = __SEQLOCK_UNLOCKED(sl)

/**
 * read_seqbegin() - start a seqlock_t read side critical section
 * @sl: Pointer to seqlock_t
 *
 * Return: count, to be passed to read_seqretry()
 */
static inline unsigned read_seqbegin(const seqlock_t *sl)
{
	unsigned ret = read_seqcount_begin(&sl->seqcount);

kcsan_atomic_next(0);  /* non-raw usage, assume closing read_seqretry() */
	kcsan_flat_atomic_begin();
	return ret;
}

/**
 * read_seqretry() - end a seqlock_t read side section
 * @sl: Pointer to seqlock_t
 * @start: count, from read_seqbegin()
 *
 * read_seqretry closes the read side critical section of given seqlock_t.
 * If the critical section was invalid, it must be ignored (and typically
 * retried).
 *
 * Return: true if a read section retry is required, else false
 */
static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
{
	/*
	 * Assume not nested: read_seqretry() may be called multiple times when
	 * completing read critical section.
	 */
	kcsan_flat_atomic_end();

return read_seqcount_retry(&sl->seqcount, start);
}

/*
 * For all seqlock_t write side functions, use the the internal
 * do_write_seqcount_begin() instead of generic write_seqcount_begin().
 * This way, no redundant lockdep_assert_held() checks are added.
 */

/**
 * write_seqlock() - start a seqlock_t write side critical section
 * @sl: Pointer to seqlock_t
 *
 * write_seqlock opens a write side critical section for the given
 * seqlock_t.  It also implicitly acquires the spinlock_t embedded inside
 * that sequential lock. All seqlock_t write side sections are thus
 * automatically serialized and non-preemptible.
 *
 * Context: if the seqlock_t read section, or other write side critical
 * sections, can be invoked from hardirq or softirq contexts, use the
 * _irqsave or _bh variants of this function instead.
 */
static inline void write_seqlock(seqlock_t *sl)
{
	spin_lock(&sl->lock);
	do_write_seqcount_begin(&sl->seqcount.seqcount);
}

/**
 * write_sequnlock() - end a seqlock_t write side critical section
 * @sl: Pointer to seqlock_t
 *
 * write_sequnlock closes the (serialized and non-preemptible) write side
 * critical section of given seqlock_t.
 */
static inline void write_sequnlock(seqlock_t *sl)
{
	do_write_seqcount_end(&sl->seqcount.seqcount);
	spin_unlock(&sl->lock);
}

/**
 * write_seqlock_bh() - start a softirqs-disabled seqlock_t write section
 * @sl: Pointer to seqlock_t
 *
 * _bh variant of write_seqlock(). Use only if the read side section, or
 * other write side sections, can be invoked from softirq contexts.
 */
static inline void write_seqlock_bh(seqlock_t *sl)
{
	spin_lock_bh(&sl->lock);
	do_write_seqcount_begin(&sl->seqcount.seqcount);
}

/**
 * write_sequnlock_bh() - end a softirqs-disabled seqlock_t write section
 * @sl: Pointer to seqlock_t
 *
 * write_sequnlock_bh closes the serialized, non-preemptible, and
 * softirqs-disabled, seqlock_t write side critical section opened with
 * write_seqlock_bh().
 */
static inline void write_sequnlock_bh(seqlock_t *sl)
{
	do_write_seqcount_end(&sl->seqcount.seqcount);
	spin_unlock_bh(&sl->lock);
}

/**
 * write_seqlock_irq() - start a non-interruptible seqlock_t write section
 * @sl: Pointer to seqlock_t
 *
 * _irq variant of write_seqlock(). Use only if the read side section, or
 * other write sections, can be invoked from hardirq contexts.
 */
static inline void write_seqlock_irq(seqlock_t *sl)
{
	spin_lock_irq(&sl->lock);
	do_write_seqcount_begin(&sl->seqcount.seqcount);
}

/**
 * write_sequnlock_irq() - end a non-interruptible seqlock_t write section
 * @sl: Pointer to seqlock_t
 *
 * write_sequnlock_irq closes the serialized and non-interruptible
 * seqlock_t write side section opened with write_seqlock_irq().
 */
static inline void write_sequnlock_irq(seqlock_t *sl)
{
	do_write_seqcount_end(&sl->seqcount.seqcount);
	spin_unlock_irq(&sl->lock);
}

static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
{
	unsigned long flags;

spin_lock_irqsave(&sl->lock, flags);
	do_write_seqcount_begin(&sl->seqcount.seqcount);
	return flags;
}

/**
 * write_seqlock_irqsave() - start a non-interruptible seqlock_t write
 *                           section
 * @lock:  Pointer to seqlock_t
 * @flags: Stack-allocated storage for saving caller's local interrupt
 *         state, to be passed to write_sequnlock_irqrestore().
 *
 * _irqsave variant of write_seqlock(). Use it only if the read side
 * section, or other write sections, can be invoked from hardirq context.
 */
#define write_seqlock_irqsave(lock, flags)				\
	do { flags = __write_seqlock_irqsave(lock); } while (0)

/**
 * write_sequnlock_irqrestore() - end non-interruptible seqlock_t write
 *                                section
 * @sl:    Pointer to seqlock_t
 * @flags: Caller's saved interrupt state, from write_seqlock_irqsave()
 *
 * write_sequnlock_irqrestore closes the serialized and non-interruptible
 * seqlock_t write section previously opened with write_seqlock_irqsave().
 */
static inline void
write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
{
	do_write_seqcount_end(&sl->seqcount.seqcount);
	spin_unlock_irqrestore(&sl->lock, flags);
}

/**
 * read_seqlock_excl() - begin a seqlock_t locking reader section
 * @sl:	Pointer to seqlock_t
 *
 * read_seqlock_excl opens a seqlock_t locking reader critical section.  A
 * locking reader exclusively locks out *both* other writers *and* other
 * locking readers, but it does not update the embedded sequence number.
 *
 * Locking readers act like a normal spin_lock()/spin_unlock().
 *
 * Context: if the seqlock_t write section, *or other read sections*, can
 * be invoked from hardirq or softirq contexts, use the _irqsave or _bh
 * variant of this function instead.
 *
 * The opened read section must be closed with read_sequnlock_excl().
 */
static inline void read_seqlock_excl(seqlock_t *sl)
{
	spin_lock(&sl->lock);
}

/**
 * read_sequnlock_excl() - end a seqlock_t locking reader critical section
 * @sl: Pointer to seqlock_t
 */
static inline void read_sequnlock_excl(seqlock_t *sl)
{
	spin_unlock(&sl->lock);
}

/**
 * read_seqlock_excl_bh() - start a seqlock_t locking reader section with
 *			    softirqs disabled
 * @sl: Pointer to seqlock_t
 *
 * _bh variant of read_seqlock_excl(). Use this variant only if the
 * seqlock_t write side section, *or other read sections*, can be invoked
 * from softirq contexts.
 */
static inline void read_seqlock_excl_bh(seqlock_t *sl)
{
	spin_lock_bh(&sl->lock);
}

/**
 * read_sequnlock_excl_bh() - stop a seqlock_t softirq-disabled locking
 *			      reader section
 * @sl: Pointer to seqlock_t
 */
static inline void read_sequnlock_excl_bh(seqlock_t *sl)
{
	spin_unlock_bh(&sl->lock);
}

/**
 * read_seqlock_excl_irq() - start a non-interruptible seqlock_t locking
 *			     reader section
 * @sl: Pointer to seqlock_t
 *
 * _irq variant of read_seqlock_excl(). Use this only if the seqlock_t
 * write side section, *or other read sections*, can be invoked from a
 * hardirq context.
 */
static inline void read_seqlock_excl_irq(seqlock_t *sl)
{
	spin_lock_irq(&sl->lock);
}

/**
 * read_sequnlock_excl_irq() - end an interrupts-disabled seqlock_t
 *                             locking reader section
 * @sl: Pointer to seqlock_t
 */
static inline void read_sequnlock_excl_irq(seqlock_t *sl)
{
	spin_unlock_irq(&sl->lock);
}

static inline unsigned long __read_seqlock_excl_irqsave(seqlock_t *sl)
{
	unsigned long flags;

spin_lock_irqsave(&sl->lock, flags);
	return flags;
}

/**
 * read_seqlock_excl_irqsave() - start a non-interruptible seqlock_t
 *				 locking reader section
 * @lock:  Pointer to seqlock_t
 * @flags: Stack-allocated storage for saving caller's local interrupt
 *         state, to be passed to read_sequnlock_excl_irqrestore().
 *
 * _irqsave variant of read_seqlock_excl(). Use this only if the seqlock_t
 * write side section, *or other read sections*, can be invoked from a
 * hardirq context.
 */
#define read_seqlock_excl_irqsave(lock, flags)				\
	do { flags = __read_seqlock_excl_irqsave(lock); } while (0)

/**
 * read_sequnlock_excl_irqrestore() - end non-interruptible seqlock_t
 *				      locking reader section
 * @sl:    Pointer to seqlock_t
 * @flags: Caller saved interrupt state, from read_seqlock_excl_irqsave()
 */
static inline void
read_sequnlock_excl_irqrestore(seqlock_t *sl, unsigned long flags)
{
	spin_unlock_irqrestore(&sl->lock, flags);
}

/**
 * read_seqbegin_or_lock() - begin a seqlock_t lockless or locking reader
 * @lock: Pointer to seqlock_t
 * @seq : Marker and return parameter. If the passed value is even, the
 * reader will become a *lockless* seqlock_t reader as in read_seqbegin().
 * If the passed value is odd, the reader will become a *locking* reader
 * as in read_seqlock_excl().  In the first call to this function, the
 * caller *must* initialize and pass an even value to @seq; this way, a
 * lockless read can be optimistically tried first.
 *
 * read_seqbegin_or_lock is an API designed to optimistically try a normal
 * lockless seqlock_t read section first.  If an odd counter is found, the
 * lockless read trial has failed, and the next read iteration transforms
 * itself into a full seqlock_t locking reader.
 *
 * This is typically used to avoid seqlock_t lockless readers starvation
 * (too much retry loops) in the case of a sharp spike in write side
 * activity.
 *
 * Context: if the seqlock_t write section, *or other read sections*, can
 * be invoked from hardirq or softirq contexts, use the _irqsave or _bh
 * variant of this function instead.
 *
 * Check Documentation/locking/seqlock.rst for template example code.
 *
 * Return: the encountered sequence counter value, through the @seq
 * parameter, which is overloaded as a return parameter. This returned
 * value must be checked with need_seqretry(). If the read section need to
 * be retried, this returned value must also be passed as the @seq
 * parameter of the next read_seqbegin_or_lock() iteration.
 */
static inline void read_seqbegin_or_lock(seqlock_t *lock, int *seq)
{
	if (!(*seq & 1))	/* Even */
		*seq = read_seqbegin(lock);
	else			/* Odd */
		read_seqlock_excl(lock);
}

/**
 * need_seqretry() - validate seqlock_t "locking or lockless" read section
 * @lock: Pointer to seqlock_t
 * @seq: sequence count, from read_seqbegin_or_lock()
 *
 * Return: true if a read section retry is required, false otherwise
 */
static inline int need_seqretry(seqlock_t *lock, int seq)
{
	return !(seq & 1) && read_seqretry(lock, seq);
}

/**
 * done_seqretry() - end seqlock_t "locking or lockless" reader section
 * @lock: Pointer to seqlock_t
 * @seq: count, from read_seqbegin_or_lock()
 *
 * done_seqretry finishes the seqlock_t read side critical section started
 * with read_seqbegin_or_lock() and validated by need_seqretry().
 */
static inline void done_seqretry(seqlock_t *lock, int seq)
{
	if (seq & 1)
		read_sequnlock_excl(lock);
}

/**
 * read_seqbegin_or_lock_irqsave() - begin a seqlock_t lockless reader, or
 *                                   a non-interruptible locking reader
 * @lock: Pointer to seqlock_t
 * @seq:  Marker and return parameter. Check read_seqbegin_or_lock().
 *
 * This is the _irqsave variant of read_seqbegin_or_lock(). Use it only if
 * the seqlock_t write section, *or other read sections*, can be invoked
 * from hardirq context.
 *
 * Note: Interrupts will be disabled only for "locking reader" mode.
 *
 * Return:
 *
 *   1. The saved local interrupts state in case of a locking reader, to
 *      be passed to done_seqretry_irqrestore().
 *
 *   2. The encountered sequence counter value, returned through @seq
 *      overloaded as a return parameter. Check read_seqbegin_or_lock().
 */
static inline unsigned long
read_seqbegin_or_lock_irqsave(seqlock_t *lock, int *seq)
{
	unsigned long flags = 0;

if (!(*seq & 1))	/* Even */
		*seq = read_seqbegin(lock);
	else			/* Odd */
		read_seqlock_excl_irqsave(lock, flags);

return flags;
}

/**
 * done_seqretry_irqrestore() - end a seqlock_t lockless reader, or a
 *				non-interruptible locking reader section
 * @lock:  Pointer to seqlock_t
 * @seq:   Count, from read_seqbegin_or_lock_irqsave()
 * @flags: Caller's saved local interrupt state in case of a locking
 *	   reader, also from read_seqbegin_or_lock_irqsave()
 *
 * This is the _irqrestore variant of done_seqretry(). The read section
 * must've been opened with read_seqbegin_or_lock_irqsave(), and validated
 * by need_seqretry().
 */
static inline void
done_seqretry_irqrestore(seqlock_t *lock, int seq, unsigned long flags)
{
	if (seq & 1)
		read_sequnlock_excl_irqrestore(lock, flags);
}
#endif /* __LINUX_SEQLOCK_H */

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