From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: + asm-generic-dont-warn-that-atomic_t-is-only-24-bit.patch added to -mm tree Date: Fri, 30 Apr 2010 14:58:25 -0700 Message-ID: <201004302158.o3ULwPMW016143@imap1.linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:59368 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756320Ab0D3V7U (ORCPT ); Fri, 30 Apr 2010 17:59:20 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mm-commits@vger.kernel.org Cc: peter.fritzsche@gmx.de 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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: asm-generic: don't warn that atomic_t is only 24 bit From: Peter Fritzsche 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 Signed-off-by: Andrew Morton --- 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@gmx.de are mn10300-use-generic-atomich.patch asm-generic-dont-warn-that-atomic_t-is-only-24-bit.patch