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| author | Will Deacon <will.deacon@arm.com> | 2013-08-12 19:03:26 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-08-13 21:22:43 +0200 |
| commit | afa31d8eb86fc2f25083e675d57ac8173a98f999 (patch) | |
| tree | b266adc9aebcda0a7eccd7adbd07a4a5aab3ceee | |
| parent | Merge branch 'security-fixes' into fixes (diff) | |
| download | linux-afa31d8eb86fc2f25083e675d57ac8173a98f999.tar.xz linux-afa31d8eb86fc2f25083e675d57ac8173a98f999.zip | |
ARM: 7811/1: locks: use early clobber in arch_spin_trylock
The res variable is written before we've finished with the input
operands (namely the lock address), so ensure that we mark it as `early
clobber' to avoid unintended register sharing.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/include/asm/spinlock.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/include/asm/spinlock.h b/arch/arm/include/asm/spinlock.h index f8b8965666e9..7ed43f68e044 100644 --- a/arch/arm/include/asm/spinlock.h +++ b/arch/arm/include/asm/spinlock.h @@ -107,7 +107,7 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock) " subs %1, %0, %0, ror #16\n" " addeq %0, %0, %4\n" " strexeq %2, %0, [%3]" - : "=&r" (slock), "=&r" (contended), "=r" (res) + : "=&r" (slock), "=&r" (contended), "=&r" (res) : "r" (&lock->slock), "I" (1 << TICKET_SHIFT) : "cc"); } while (res); |