diff options
| author | Jan Beulich <jbeulich@novell.com> | 2008-08-04 14:38:54 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-15 16:26:51 +0200 |
| commit | 7bc069c6bc4ede519a7116be1b9e149a1dbf787a (patch) | |
| tree | 6f3506469c33869126df962b743c2899efe1ec00 /include | |
| parent | 8bb851900f5d0a79d3fddac808cc670d9894ef67 (diff) | |
| download | linux-7bc069c6bc4ede519a7116be1b9e149a1dbf787a.tar.gz linux-7bc069c6bc4ede519a7116be1b9e149a1dbf787a.tar.bz2 linux-7bc069c6bc4ede519a7116be1b9e149a1dbf787a.zip | |
x86: fix spin_is_contended()
The masked difference is what needs to be compared against 1, rather
than the difference of masked values (which can be negative).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86/spinlock.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-x86/spinlock.h b/include/asm-x86/spinlock.h index 4f9a9861799a..e39c790dbfd2 100644 --- a/include/asm-x86/spinlock.h +++ b/include/asm-x86/spinlock.h @@ -65,7 +65,7 @@ static inline int __ticket_spin_is_contended(raw_spinlock_t *lock) { int tmp = ACCESS_ONCE(lock->slock); - return (((tmp >> 8) & 0xff) - (tmp & 0xff)) > 1; + return (((tmp >> 8) - tmp) & 0xff) > 1; } static __always_inline void __ticket_spin_lock(raw_spinlock_t *lock) @@ -127,7 +127,7 @@ static inline int __ticket_spin_is_contended(raw_spinlock_t *lock) { int tmp = ACCESS_ONCE(lock->slock); - return (((tmp >> 16) & 0xffff) - (tmp & 0xffff)) > 1; + return (((tmp >> 16) - tmp) & 0xffff) > 1; } static __always_inline void __ticket_spin_lock(raw_spinlock_t *lock) |