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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-06-29 15:53:02 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-08-17 08:08:59 -0700 |
| commit | 952111d7db02573e7165e338de8d4871fa447b21 (patch) | |
| tree | 9b66fe680204959a22ef8cf72c97180de2a6643b /arch/ia64 | |
| parent | d3a024abbc438277851c510b51ec9b158821488b (diff) | |
| download | lwn-952111d7db02573e7165e338de8d4871fa447b21.tar.gz lwn-952111d7db02573e7165e338de8d4871fa447b21.zip | |
arch: Remove spin_unlock_wait() arch-specific definitions
There is no agreed-upon definition of spin_unlock_wait()'s semantics,
and it appears that all callers could do just as well with a lock/unlock
pair. This commit therefore removes the underlying arch-specific
arch_spin_unlock_wait() for all architectures providing them.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Andrea Parri <parri.andrea@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/include/asm/spinlock.h | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h index ca9e76149a4a..df2c121164b8 100644 --- a/arch/ia64/include/asm/spinlock.h +++ b/arch/ia64/include/asm/spinlock.h @@ -76,22 +76,6 @@ static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock) ACCESS_ONCE(*p) = (tmp + 2) & ~1; } -static __always_inline void __ticket_spin_unlock_wait(arch_spinlock_t *lock) -{ - int *p = (int *)&lock->lock, ticket; - - ia64_invala(); - - for (;;) { - asm volatile ("ld4.c.nc %0=[%1]" : "=r"(ticket) : "r"(p) : "memory"); - if (!(((ticket >> TICKET_SHIFT) ^ ticket) & TICKET_MASK)) - return; - cpu_relax(); - } - - smp_acquire__after_ctrl_dep(); -} - static inline int __ticket_spin_is_locked(arch_spinlock_t *lock) { long tmp = ACCESS_ONCE(lock->lock); @@ -143,11 +127,6 @@ static __always_inline void arch_spin_lock_flags(arch_spinlock_t *lock, arch_spin_lock(lock); } -static inline void arch_spin_unlock_wait(arch_spinlock_t *lock) -{ - __ticket_spin_unlock_wait(lock); -} - #define arch_read_can_lock(rw) (*(volatile int *)(rw) >= 0) #define arch_write_can_lock(rw) (*(volatile int *)(rw) == 0) |