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seqlock: Cure some more scoped_seqlock() optimization fails

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commit 90dfeef1cd upstream.

Arnd reported an x86 randconfig using gcc-15 tripped over
__scoped_seqlock_bug(). Turns out GCC chose not to inline the
scoped_seqlock helper functions and as such was not able to optimize
properly.

[ mingo: Clang fails the build too in some circumstances. ]

Reported-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Link: https://patch.msgid.link/20251204104332.GG2528459@noisy.programming.kicks-ass.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra
2026-08-03 11:15:10 +02:00
committed by Greg Kroah-Hartman
parent c90b043ff0
commit 4f292febac
1 changed files with 2 additions and 2 deletions
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include/linux/seqlock.h
+2 -2
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@@ -1281,7 +1281,7 @@ struct ss_tmp {
spinlock_t *lock_irqsave;
};
static inline void __scoped_seqlock_cleanup(struct ss_tmp *sst)
static __always_inline void __scoped_seqlock_cleanup(struct ss_tmp *sst)
{
if (sst->lock)
spin_unlock(sst->lock);
@@ -1306,7 +1306,7 @@ static inline void __scoped_seqlock_bug(void) { }
extern void __scoped_seqlock_bug(void);
#endif
static inline void
static __always_inline void
__scoped_seqlock_next(struct ss_tmp *sst, seqlock_t *lock, enum ss_state target)
{
switch (sst->state) {