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authorChris Metcalf <cmetcalf@tilera.com>2013-02-01 12:37:48 -0500
committerChris Metcalf <cmetcalf@tilera.com>2013-03-22 15:47:00 -0400
commitadf6d9b30f089c52e674e84ca2960581e504e5e3 (patch)
treef680f2877480201116e54da1e6a1af848884d646 /arch/tile
parentef567f25d5d9d803b89bc2aec6bb71fe8b4bebd9 (diff)
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tile: support atomic64_dec_if_positive()
Use the normal cmpxchg() idiom to implement this functionality. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile')
-rw-r--r--arch/tile/Kconfig1
-rw-r--r--arch/tile/include/asm/atomic.h21
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 0e500d90c2a0..9a9d08637ab9 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -24,6 +24,7 @@ config TILE
select MODULES_USE_ELF_RELA
select HAVE_ARCH_TRACEHOOK
select HAVE_SYSCALL_TRACEPOINTS
+ select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h
index f2461429a4a4..e71387ab20ca 100644
--- a/arch/tile/include/asm/atomic.h
+++ b/arch/tile/include/asm/atomic.h
@@ -131,4 +131,25 @@ static inline int atomic_read(const atomic_t *v)
#include <asm/atomic_64.h>
#endif
+#ifndef __ASSEMBLY__
+
+static inline long long atomic64_dec_if_positive(atomic64_t *v)
+{
+ long long c, old, dec;
+
+ c = atomic64_read(v);
+ for (;;) {
+ dec = c - 1;
+ if (unlikely(dec < 0))
+ break;
+ old = atomic64_cmpxchg((v), c, dec);
+ if (likely(old == c))
+ break;
+ c = old;
+ }
+ return dec;
+}
+
+#endif /* __ASSEMBLY__ */
+
#endif /* _ASM_TILE_ATOMIC_H */