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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-28 09:33:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-28 09:33:25 -0800 |
| commit | 2180f214f4a5d8e2d8b7138d9a59246ee05753b9 (patch) | |
| tree | aeb600fba396606e1998c34bb527d184b2b113c1 /arch | |
| parent | Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| parent | locking/osq: Use optimized spinning loop for arm64 (diff) | |
| download | linux-dev-2180f214f4a5d8e2d8b7138d9a59246ee05753b9.tar.xz linux-dev-2180f214f4a5d8e2d8b7138d9a59246ee05753b9.zip | |
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"Just a handful of changes in this cycle: an ARM64 performance
optimization, a comment fix and a debug output fix"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/osq: Use optimized spinning loop for arm64
locking/qspinlock: Fix inaccessible URL of MCS lock paper
locking/lockdep: Fix lockdep_stats indentation problem
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/spinlock.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h index b093b287babf..102404dc1e13 100644 --- a/arch/arm64/include/asm/spinlock.h +++ b/arch/arm64/include/asm/spinlock.h @@ -11,4 +11,13 @@ /* See include/linux/spinlock.h */ #define smp_mb__after_spinlock() smp_mb() +/* + * Changing this will break osq_lock() thanks to the call inside + * smp_cond_load_relaxed(). + * + * See: + * https://lore.kernel.org/lkml/20200110100612.GC2827@hirez.programming.kicks-ass.net + */ +#define vcpu_is_preempted(cpu) false + #endif /* __ASM_SPINLOCK_H */ |