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Commit 37682177 authored by Peter Fritzsche's avatar Peter Fritzsche Committed by Linus Torvalds
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asm-generic: don't warn that atomic_t is only 24 bit 



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: default avatarPeter Fritzsche <peter.fritzsche@gmx.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fc62f2f1

include/asm-generic/atomic.h

+2 −6
Original line number Diff line number Diff line
@@ -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)

{