From 952111d7db02573e7165e338de8d4871fa447b21 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 29 Jun 2017 15:53:02 -0700 Subject: 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 Cc: Cc: Peter Zijlstra Cc: Alan Stern Cc: Andrea Parri Cc: Linus Torvalds Acked-by: Will Deacon Acked-by: Boqun Feng --- arch/powerpc/include/asm/spinlock.h | 33 --------------------------------- 1 file changed, 33 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h index 8c1b913de6d7..d256e448ea49 100644 --- a/arch/powerpc/include/asm/spinlock.h +++ b/arch/powerpc/include/asm/spinlock.h @@ -170,39 +170,6 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock) lock->slock = 0; } -static inline void arch_spin_unlock_wait(arch_spinlock_t *lock) -{ - arch_spinlock_t lock_val; - - smp_mb(); - - /* - * Atomically load and store back the lock value (unchanged). This - * ensures that our observation of the lock value is ordered with - * respect to other lock operations. - */ - __asm__ __volatile__( -"1: " PPC_LWARX(%0, 0, %2, 0) "\n" -" stwcx. %0, 0, %2\n" -" bne- 1b\n" - : "=&r" (lock_val), "+m" (*lock) - : "r" (lock) - : "cr0", "xer"); - - if (arch_spin_value_unlocked(lock_val)) - goto out; - - while (lock->slock) { - HMT_low(); - if (SHARED_PROCESSOR) - __spin_yield(lock); - } - HMT_medium(); - -out: - smp_mb(); -} - /* * Read-write spinlocks, allowing multiple readers * but only one writer. -- cgit 1.4.1