diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-03-31 02:30:49 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-31 12:18:55 -0800 |
| commit | 2cf8d82d63807c2c68adf20bb28bf502496186dd (patch) | |
| tree | 13cafaa87dafa639f3876bcda6d302266a349c88 /include/asm-generic/local.h | |
| parent | 09ce3512dcad0ad1d07eee0dc5ebb6d037c39c16 (diff) | |
| download | op-kernel-dev-2cf8d82d63807c2c68adf20bb28bf502496186dd.zip op-kernel-dev-2cf8d82d63807c2c68adf20bb28bf502496186dd.tar.gz | |
[PATCH] make local_t signed
local_t's were defined to be unsigned. This increases confusion because
atomic_t's are signed. The patch goes through and changes all implementations
to use signed longs throughout.
Also, x86-64 was using 32-bit quantities for the value passed into local_add()
and local_sub(). Fixed.
All (actually, both) existing users have been audited.
(Also s/__inline__/inline/ in x86_64/local.h)
Cc: Andi Kleen <ak@muc.de>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Kyle McMartin <kyle@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic/local.h')
| -rw-r--r-- | include/asm-generic/local.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/include/asm-generic/local.h b/include/asm-generic/local.h index de46148..9291c24 100644 --- a/include/asm-generic/local.h +++ b/include/asm-generic/local.h @@ -7,8 +7,15 @@ #include <asm/atomic.h> #include <asm/types.h> -/* An unsigned long type for operations which are atomic for a single - * CPU. Usually used in combination with per-cpu variables. */ +/* + * A signed long type for operations which are atomic for a single CPU. + * Usually used in combination with per-cpu variables. + * + * This is the default implementation, which uses atomic_long_t. Which is + * rather pointless. The whole point behind local_t is that some processors + * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs + * running on this CPU. local_t allows exploitation of such capabilities. + */ /* Implement in terms of atomics. */ @@ -20,7 +27,7 @@ typedef struct #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } -#define local_read(l) ((unsigned long)atomic_long_read(&(l)->a)) +#define local_read(l) atomic_long_read(&(l)->a) #define local_set(l,i) atomic_long_set((&(l)->a),(i)) #define local_inc(l) atomic_long_inc(&(l)->a) #define local_dec(l) atomic_long_dec(&(l)->a) |
