diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2017-06-07 17:51:27 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-08-10 12:29:03 +0200 |
| commit | a9668cd6ee288c4838bc668880ac085be551cac2 (patch) | |
| tree | 5a4b71cef5d9f8acf8f2c67c4c518146b1c49a51 /arch | |
| parent | d89e588ca4081615216cc25f2489b0281ac0bfe9 (diff) | |
| download | lwn-a9668cd6ee288c4838bc668880ac085be551cac2.tar.gz lwn-a9668cd6ee288c4838bc668880ac085be551cac2.zip | |
locking: Remove smp_mb__before_spinlock()
Now that there are no users of smp_mb__before_spinlock() left, remove
it entirely.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/spinlock.h | 9 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/barrier.h | 7 |
2 files changed, 0 insertions, 16 deletions
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h index b103888b694a..ae4241ab19a8 100644 --- a/arch/arm64/include/asm/spinlock.h +++ b/arch/arm64/include/asm/spinlock.h @@ -358,15 +358,6 @@ static inline int arch_read_trylock(arch_rwlock_t *rw) #define arch_read_relax(lock) cpu_relax() #define arch_write_relax(lock) cpu_relax() -/* - * Accesses appearing in program order before a spin_lock() operation - * can be reordered with accesses inside the critical section, by virtue - * of arch_spin_lock being constructed using acquire semantics. - * - * In cases where this is problematic (e.g. try_to_wake_up), an - * smp_mb__before_spinlock() can restore the required ordering. - */ -#define smp_mb__before_spinlock() smp_mb() /* See include/linux/spinlock.h */ #define smp_mb__after_spinlock() smp_mb() diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index 25d42bd3f114..9c601adfc500 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -74,13 +74,6 @@ do { \ ___p1; \ }) -/* - * This must resolve to hwsync on SMP for the context switch path. - * See _switch, and core scheduler context switch memory ordering - * comments. - */ -#define smp_mb__before_spinlock() smp_mb() - #include <asm-generic/barrier.h> #endif /* _ASM_POWERPC_BARRIER_H */ |