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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2006-12-06 20:32:20 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:21 -0800
commita866374aecc90c7d90619727ccd851ac096b2fc7 (patch)
treeeabae0b36b5281dcef20563470c7f05549689b8c /arch/s390/lib
parent6edaf68a87d17570790fd55f0c451a29ec1d6703 (diff)
downloadlinux-linaro-android-a866374aecc90c7d90619727ccd851ac096b2fc7.tar.gz
[PATCH] mm: pagefault_{disable,enable}()
Introduce pagefault_{disable,enable}() and use these where previously we did manual preempt increments/decrements to make the pagefault handler do the atomic thing. Currently they still rely on the increased preempt count, but do not rely on the disabled preemption, this might go away in the future. (NOTE: the extra barrier() in pagefault_disable might fix some holes on machines which have too many registers for their own good) [heiko.carstens@de.ibm.com: s390 fix] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Nick Piggin <npiggin@suse.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/lib')
-rw-r--r--arch/s390/lib/uaccess_std.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/lib/uaccess_std.c b/arch/s390/lib/uaccess_std.c
index 2d549ed2e11..bbaca66fa29 100644
--- a/arch/s390/lib/uaccess_std.c
+++ b/arch/s390/lib/uaccess_std.c
@@ -11,7 +11,7 @@
#include <linux/errno.h>
#include <linux/mm.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/futex.h>
#ifndef __s390x__
@@ -258,7 +258,7 @@ int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old)
{
int oldval = 0, newval, ret;
- inc_preempt_count();
+ pagefault_disable();
switch (op) {
case FUTEX_OP_SET:
@@ -284,7 +284,7 @@ int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old)
default:
ret = -ENOSYS;
}
- dec_preempt_count();
+ pagefault_enable();
*old = oldval;
return ret;
}