Commit 7179ba52 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt

powerpc: Implement arch_spin_is_locked() using arch_spin_value_unlocked()

At a glance these are just the inverse of each other. The one subtlety
is that arch_spin_value_unlocked() takes the lock by value, rather than
as a pointer, which is important for the lockref code.

On the other hand arch_spin_is_locked() doesn't really care, so
implement it in terms of arch_spin_value_unlocked().
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 3405d230
...@@ -28,8 +28,6 @@ ...@@ -28,8 +28,6 @@
#include <asm/synch.h> #include <asm/synch.h>
#include <asm/ppc-opcode.h> #include <asm/ppc-opcode.h>
#define arch_spin_is_locked(x) ((x)->slock != 0)
#ifdef CONFIG_PPC64 #ifdef CONFIG_PPC64
/* use 0x800000yy when locked, where yy == CPU number */ /* use 0x800000yy when locked, where yy == CPU number */
#ifdef __BIG_ENDIAN__ #ifdef __BIG_ENDIAN__
...@@ -59,6 +57,11 @@ static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock) ...@@ -59,6 +57,11 @@ static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock)
return lock.slock == 0; return lock.slock == 0;
} }
static inline int arch_spin_is_locked(arch_spinlock_t *lock)
{
return !arch_spin_value_unlocked(*lock);
}
/* /*
* This returns the old value in the lock, so we succeeded * This returns the old value in the lock, so we succeeded
* in getting the lock if the return value is 0. * in getting the lock if the return value is 0.
......
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