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authorWill Deacon <will.deacon@arm.com>2013-08-12 13:03:26 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-08-13 15:22:43 -0400
commitafa31d8eb86fc2f25083e675d57ac8173a98f999 (patch)
treeb266adc9aebcda0a7eccd7adbd07a4a5aab3ceee /arch
parente35ac62d2202e31307c0f9b278a61e484c4727f2 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/spinlock.h2
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)
107 " subs %1, %0, %0, ror #16\n" 107 " subs %1, %0, %0, ror #16\n"
108 " addeq %0, %0, %4\n" 108 " addeq %0, %0, %4\n"
109 " strexeq %2, %0, [%3]" 109 " strexeq %2, %0, [%3]"
110 : "=&r" (slock), "=&r" (contended), "=r" (res) 110 : "=&r" (slock), "=&r" (contended), "=&r" (res)
111 : "r" (&lock->slock), "I" (1 << TICKET_SHIFT) 111 : "r" (&lock->slock), "I" (1 << TICKET_SHIFT)
112 : "cc"); 112 : "cc");
113 } while (res); 113 } while (res);