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asm-generic: don't warn that atomic_t is only 24 bit

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32-bit Sparc used to only allow usage of 24-bit of it's atomic_t type.
This was corrected with linux 2.6.3 when Keith M Wesolowski changed the
implementation to use the parisc approach of having an array of spinlocks
to protect the atomic_t.

These warnings were also removed from the sparc implementation when the
new implementation was merged in BKrev:402e4949VThdc6D3iaosSFUgabMfvw, but
the warning still remained in some other places without any 24-bit-only
atomic_t implementation inside the kernel.

We should remove these warnings to allow users to rely on the full 32-bit
range of atomic_t.

Signed-off-by: Peter Fritzsche <peter.fritzsche@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Fritzsche 2010-05-24 14:33:09 -07:00 committed by Linus Torvalds
parent fc62f2f19e
commit 37682177af
1 changed files with 2 additions and 6 deletions
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8
include/asm-generic/atomic.h
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@ -30,8 +30,7 @@
* atomic_read - read atomic variable
* @v: pointer of type atomic_t
*
* Atomically reads the value of @v. Note that the guaranteed
* useful range of an atomic_t is only 24 bits.
* Atomically reads the value of @v.
*/
#define atomic_read(v) (*(volatile int *)&(v)->counter)
@ -40,8 +39,7 @@
* @v: pointer of type atomic_t
* @i: required value
*
* Atomically sets the value of @v to @i. Note that the guaranteed
* useful range of an atomic_t is only 24 bits.
* Atomically sets the value of @v to @i.
*/
#define atomic_set(v, i) (((v)->counter) = (i))
@ -53,7 +51,6 @@
* @v: pointer of type atomic_t
*
* Atomically adds @i to @v and returns the result
* Note that the guaranteed useful range of an atomic_t is only 24 bits.
*/
static inline int atomic_add_return(int i, atomic_t *v)
{
@ -75,7 +72,6 @@ static inline int atomic_add_return(int i, atomic_t *v)
* @v: pointer of type atomic_t
*
* Atomically subtracts @i from @v and returns the result
* Note that the guaranteed useful range of an atomic_t is only 24 bits.
*/
static inline int atomic_sub_return(int i, atomic_t *v)
{