diff options
| author | Will Deacon <will.deacon@arm.com> | 2017-10-03 19:25:27 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-10-10 11:50:18 +0200 |
| commit | a8a217c22116eff6c120d753c9934089fb229af0 (patch) | |
| tree | d56f1283ba7153f9ead9fb92c1a1794143c6e4a3 /include/linux/spinlock_up.h | |
| parent | 26c4eb192c6224e5297496cead36404b62fb071b (diff) | |
| download | lwn-a8a217c22116eff6c120d753c9934089fb229af0.tar.gz lwn-a8a217c22116eff6c120d753c9934089fb229af0.zip | |
locking/core: Remove {read,spin,write}_can_lock()
Outside of the locking code itself, {read,spin,write}_can_lock() have no
users in tree. Apparmor (the last remaining user of write_can_lock()) got
moved over to lockdep by the previous patch.
This patch removes the use of {read,spin,write}_can_lock() from the
BUILD_LOCK_OPS macro, deferring to the trylock operation for testing the
lock status, and subsequently removes the unused macros altogether. They
aren't guaranteed to work in a concurrent environment and can give
incorrect results in the case of qrwlock.
Signed-off-by: Will Deacon <will.deacon@arm.com>
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>
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1507055129-12300-2-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/spinlock_up.h')
| -rw-r--r-- | include/linux/spinlock_up.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/spinlock_up.h b/include/linux/spinlock_up.h index 612fb530af41..901cf8f44388 100644 --- a/include/linux/spinlock_up.h +++ b/include/linux/spinlock_up.h @@ -77,7 +77,4 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock) #define arch_spin_is_contended(lock) (((void)(lock), 0)) -#define arch_read_can_lock(lock) (((void)(lock), 1)) -#define arch_write_can_lock(lock) (((void)(lock), 1)) - #endif /* __LINUX_SPINLOCK_UP_H */ |