Peter Zijlstra fb83772959 seqlock/latch: Provide raw_read_seqcount_latch_retry() ... [ Upstream commit d16317de9b ] The read side of seqcount_latch consists of: do { seq = raw_read_seqcount_latch(&latch->seq); ... } while (read_seqcount_latch_retry(&latch->seq, seq)); which is asymmetric in the raw_ department, and sure enough, read_seqcount_latch_retry() includes (explicit) instrumentation where raw_read_seqcount_latch() does not. This inconsistency becomes a problem when trying to use it from noinstr code. As such, fix it by renaming and re-implementing raw_read_seqcount_latch_retry() without the instrumentation. Specifically the instrumentation in question is kcsan_atomic_next(0) in do___read_seqcount_retry(). Loosing this annotation is not a problem because raw_read_seqcount_latch() does not pass through kcsan_atomic_next(KCSAN_SEQLOCK_REGION_MAX). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Tested-by: Michael Kelley <mikelley@microsoft.com> # Hyper-V Link: https://lore.kernel.org/r/20230519102715.233598176@infradead.org Stable-dep-of: 5c1806c41c ("kcsan, seqlock: Support seqcount_latch_t") Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-12-14 19:53:19 +01:00
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braille.c	printk: Replace strncmp() with str_has_prefix()	2019-08-16 09:54:08 +02:00
braille.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
console_cmdline.h	printk: Fix preferred console selection with multiple matches	2020-02-18 09:34:42 +01:00
index.c	kernel/printk/index.c: fix memory leak with using debugfs_lookup()	2023-03-11 13:55:32 +01:00
internal.h	Revert "printk: Wait for the global console lock when the system is going down"	2022-06-23 18:41:40 +02:00
Makefile	printk: move printk sysctl to printk/sysctl.c	2022-01-22 08:33:35 +02:00
printk_ringbuffer.c	printk: ringbuffer: Fix truncating buffer size min_t cast	2023-09-13 09:43:00 +02:00
printk_ringbuffer.h	printk: ringbuffer: Improve prb_next_seq() performance	2022-01-26 16:00:32 +01:00
printk_safe.c	printk: Consolidate console deferred printing	2023-09-23 11:11:07 +02:00
printk.c	seqlock/latch: Provide raw_read_seqcount_latch_retry()	2024-12-14 19:53:19 +01:00
sysctl.c	printk: Fix incorrect __user type in proc_dointvec_minmax_sysadmin()	2022-02-03 11:27:38 -08:00