This is a note to let you know that I've just added the patch titled
ARM: 7811/1: locks: use early clobber in arch_spin_trylock
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-7811-1-locks-use-early-clobber-in-arch_spin_trylock.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From afa31d8eb86fc2f25083e675d57ac8173a98f999 Mon Sep 17 00:00:00 2001
From: Will Deacon <will.deacon@xxxxxxx>
Date: Mon, 12 Aug 2013 18:03:26 +0100
Subject: ARM: 7811/1: locks: use early clobber in arch_spin_trylock
From: Will Deacon <will.deacon@xxxxxxx>
commit afa31d8eb86fc2f25083e675d57ac8173a98f999 upstream.
The res variable is written before we've finished with the input
operands (namely the lock address), so ensure that we mark it as `early
clobber' to avoid unintended register sharing.
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Cc: Wang Weidong <wangweidong1@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/include/asm/spinlock.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm/include/asm/spinlock.h
+++ b/arch/arm/include/asm/spinlock.h
@@ -107,7 +107,7 @@ static inline int arch_spin_trylock(arch
" subs %1, %0, %0, ror #16\n"
" addeq %0, %0, %4\n"
" strexeq %2, %0, [%3]"
- : "=&r" (slock), "=&r" (contended), "=r" (res)
+ : "=&r" (slock), "=&r" (contended), "=&r" (res)
: "r" (&lock->slock), "I" (1 << TICKET_SHIFT)
: "cc");
} while (res);
Patches currently in stable-queue which might be from will.deacon@xxxxxxx are
queue-3.10/arm-7811-1-locks-use-early-clobber-in-arch_spin_trylock.patch
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