linux-kernel - [PATCH RFC] x86: uaccess s/might_sleep/might

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Message-ID: <20130502022134.GA7700@redhat.com>
Date:	Thu, 2 May 2013 05:21:34 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH RFC] x86: uaccess s/might_sleep/might_fault/

The only reason uaccess routines might sleep
is if they fault. Make this explicit for
__copy_from_user_nocache, and consistent with
copy_from_user and friends.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---

I've updated all other arches as well - still
build-testing. Any objections to the x86 patch?

 arch/x86/include/asm/uaccess_64.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
index 142810c..4f7923d 100644
--- a/arch/x86/include/asm/uaccess_64.h
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -235,7 +235,7 @@ extern long __copy_user_nocache(void *dst, const void __user *src,
 static inline int
 __copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
 {
-	might_sleep();
+	might_fault();
 	return __copy_user_nocache(dst, src, size, 1);
 }
 
-- 
MST
--
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