aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorWill Deacon <will.deacon@arm.com>2013-08-12 18:03:26 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-03-23 21:38:13 -0700
commit9400319cc170bec3ff02f0adcb978552682725af (patch)
tree0793ee1cf60f6f62b408f04aa66fb3145708e1b7 /arch
parent5184c0b7c349f6783986d1848a5f1cdf333075b1 (diff)
downloadlinaro-lsk-9400319cc170bec3ff02f0adcb978552682725af.tar.gz
ARM: 7811/1: locks: use early clobber in arch_spin_trylock
commit afa31d8eb86fc2f25083e675d57ac8173a98f999 upstream. 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> Cc: Wang Weidong <wangweidong1@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 dd64cc6f9cb..b07c09e5a0a 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);