linux-kernel - [PATCH] x86: eliminate comparison between signed and unsigned integer expressions

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Message-id: <DEE794AE-9C3A-402F-AA68-50DEB8AA1565@me.com>
Date:	Sun, 10 May 2015 16:47:55 -0600
From:	Louis Langholtz <lou_langholtz@...com>
To:	linux-kernel@...r.kernel.org, x86@...nel.org
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
Subject: [PATCH] x86: eliminate comparison between signed and unsigned integer
 expressions

Eliminates multiple compiler warnings when the -Wno-sign-compare option is
removed from the x86 Makefile (an option that is documented as a "Workaround
for a gcc prelease that unfortunately was shipped in a suse release").

Signed-off-by: Louis Langholtz <lou_langholtz@...com>
---
 arch/x86/include/asm/uaccess.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index ace9dec..3289bd1 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -709,7 +709,7 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
 	 * case, and do only runtime checking for non-constant sizes.
 	 */
 
-	if (likely(sz < 0 || sz >= n))
+	if (likely(sz < 0 || ((unsigned int)sz) >= n))
 		n = _copy_from_user(to, from, n);
 	else if(__builtin_constant_p(n))
 		copy_from_user_overflow();
@@ -727,7 +727,7 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
 	might_fault();
 
 	/* See the comment in copy_from_user() above. */
-	if (likely(sz < 0 || sz >= n))
+	if (likely(sz < 0 || ((unsigned int)sz) >= n))
 		n = _copy_to_user(to, from, n);
 	else if(__builtin_constant_p(n))
 		copy_to_user_overflow();

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