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| author | Chris Metcalf <cmetcalf@tilera.com> | 2012-03-30 15:46:29 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2012-04-02 12:13:49 -0400 |
| commit | ab306cae660e524edbeb8889e4e23d3c97717b9c (patch) | |
| tree | c588cb46c9497e9271e8bc5b5b4f5e53244c6cf9 /arch/tile | |
| parent | b14f21906774be181627412fed5b6b5fae2b53a2 (diff) | |
| download | linux-ab306cae660e524edbeb8889e4e23d3c97717b9c.tar.bz2 | |
arch/tile: use atomic exchange in arch_write_unlock()
This idiom is used elsewhere when we do an unlock by writing a zero,
but I missed it here. Using an atomic operation avoids waiting
on the write buffer for the unlocking write to be sent to the home cache.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile')
| -rw-r--r-- | arch/tile/include/asm/spinlock_64.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/tile/include/asm/spinlock_64.h b/arch/tile/include/asm/spinlock_64.h index 72be5904e020..5f8b6a095fd8 100644 --- a/arch/tile/include/asm/spinlock_64.h +++ b/arch/tile/include/asm/spinlock_64.h @@ -137,7 +137,7 @@ static inline void arch_read_unlock(arch_rwlock_t *rw) static inline void arch_write_unlock(arch_rwlock_t *rw) { __insn_mf(); - rw->lock = 0; + __insn_exch4(&rw->lock, 0); /* Avoid waiting in the write buffer. */ } static inline int arch_read_trylock(arch_rwlock_t *rw) |