aboutsummaryrefslogtreecommitdiff
path: root/include/asm-arm
diff options
context:
space:
mode:
authorCatalin Marinas <catalin.marinas@arm.com>2006-05-19 21:55:35 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-05-19 21:55:35 +0100
commitc2a4c40651e08e465d3a6130bd9f6dcc1ce21d83 (patch)
treee8cc87fa6e0afad219b82655df183a3412a2f1d3 /include/asm-arm
parentec64152fee25e2a63f06d40d32c7b4cb62eab9a3 (diff)
downloadlinux-2.6.34-ux500-c2a4c40651e08e465d3a6130bd9f6dcc1ce21d83.tar.gz
[ARM] 3533/1: Implement the __raw_(read|write)_can_lock functions on ARM
Patch from Catalin Marinas Recent patches introduced the write_can_lock() call in the kernel/ptrace.c file. Implement the __raw_* variants on ARM (SMP) as well. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm')
-rw-r--r--include/asm-arm/spinlock.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-arm/spinlock.h b/include/asm-arm/spinlock.h
index 43ad4e55878..406ca97a8ab 100644
--- a/include/asm-arm/spinlock.h
+++ b/include/asm-arm/spinlock.h
@@ -142,6 +142,9 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
: "cc");
}
+/* write_can_lock - would write_trylock() succeed? */
+#define __raw_write_can_lock(x) ((x)->lock == 0x80000000)
+
/*
* Read locks are a bit more hairy:
* - Exclusively load the lock value.
@@ -198,4 +201,7 @@ static inline void __raw_read_unlock(raw_rwlock_t *rw)
#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
+/* read_can_lock - would read_trylock() succeed? */
+#define __raw_read_can_lock(x) ((x)->lock < 0x80000000)
+
#endif /* __ASM_SPINLOCK_H */