The patch titled
asm-generic: don't warn that atomic_t is only 24 bit
has been added to the -mm tree. Its filename is
asm-generic-dont-warn-that-atomic_t-is-only-24-bit.patch
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------------------------------------------------------
Subject: asm-generic: don't warn that atomic_t is only 24 bit
From: Peter Fritzsche <peter.fritzsche@xxxxxx>
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@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/atomic.h | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff -puN include/asm-generic/atomic.h~asm-generic-dont-warn-that-atomic_t-is-only-24-bit include/asm-generic/atomic.h
--- a/include/asm-generic/atomic.h~asm-generic-dont-warn-that-atomic_t-is-only-24-bit
+++ a/include/asm-generic/atomic.h
@@ -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) ((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
* @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)
{
_
Patches currently in -mm which might be from peter.fritzsche@xxxxxx are
mn10300-use-generic-atomich.patch
asm-generic-dont-warn-that-atomic_t-is-only-24-bit.patch
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