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author | Will Deacon <will.deacon@arm.com> | 2017-10-03 19:25:27 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-10-10 11:50:18 +0200 |
commit | a8a217c22116eff6c120d753c9934089fb229af0 (patch) | |
tree | d56f1283ba7153f9ead9fb92c1a1794143c6e4a3 /arch/ia64 | |
parent | 26c4eb192c6224e5297496cead36404b62fb071b (diff) | |
download | linux-a8a217c22116eff6c120d753c9934089fb229af0.tar.gz |
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 'arch/ia64')
-rw-r--r-- | arch/ia64/include/asm/spinlock.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h index df2c121164b8..c728dda59bd2 100644 --- a/arch/ia64/include/asm/spinlock.h +++ b/arch/ia64/include/asm/spinlock.h @@ -127,9 +127,6 @@ static __always_inline void arch_spin_lock_flags(arch_spinlock_t *lock, arch_spin_lock(lock); } -#define arch_read_can_lock(rw) (*(volatile int *)(rw) >= 0) -#define arch_write_can_lock(rw) (*(volatile int *)(rw) == 0) - #ifdef ASM_SUPPORTED static __always_inline void |