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From: Harvey Harrison <harvey.harrison@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] x86: sparse errors from string_32.h
Date: Thu, 31 Jan 2008 22:15:16 -0800	[thread overview]
Message-ID: <1201846516.23523.87.camel@brick> (raw)

include/asm/string_32.h:216:26: warning: cast truncates bits from constant value (cccccccc becomes cc)
include/asm/string_32.h:219:27: warning: cast truncates bits from constant value (cccccccc becomes cccc)
include/asm/string_32.h:222:27: warning: cast truncates bits from constant value (cccccccc becomes cccc)
include/asm/string_32.h:223:30: warning: cast truncates bits from constant value (cccccccc becomes cc)

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
Ingo, this shows up over and over again during the build, this
doesn't change anything as they are known compile-time constants
at this point, the and-ing just makes the truncation explicit.

If you disagree with this method, no worries.

 include/asm-x86/string_32.h |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/asm-x86/string_32.h b/include/asm-x86/string_32.h
index 55bfa30..c5d13a8 100644
--- a/include/asm-x86/string_32.h
+++ b/include/asm-x86/string_32.h
@@ -213,14 +213,14 @@ static __always_inline void * __constant_c_and_count_memset(void * s, unsigned l
 		case 0:
 			return s;
 		case 1:
-			*(unsigned char *)s = pattern;
+			*(unsigned char *)s = pattern & 0xff;
 			return s;
 		case 2:
-			*(unsigned short *)s = pattern;
+			*(unsigned short *)s = pattern & 0xffff;
 			return s;
 		case 3:
-			*(unsigned short *)s = pattern;
-			*(2+(unsigned char *)s) = pattern;
+			*(unsigned short *)s = pattern & 0xffff;
+			*(2+(unsigned char *)s) = pattern & 0xff;
 			return s;
 		case 4:
 			*(unsigned long *)s = pattern;
-- 
1.5.4.rc4.1142.gf5a97




             reply	other threads:[~2008-02-01  6:15 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-01  6:15 Harvey Harrison [this message]
2008-02-01 10:56 ` [PATCH] x86: sparse errors from string_32.h Ingo Molnar
2008-02-01 11:07   ` Harvey Harrison
2008-02-01 18:06   ` H. Peter Anvin
2008-02-02  0:40     ` Harvey Harrison

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