linux-kernel - [PATCH] x86: Get rid of 'dubious one-bit signed bitfield' sprase warning

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Date:	Wed, 11 Jan 2012 05:11:46 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Andy Lutomirski <luto@...capital.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Dan Carpenter <error27@...il.com>
Subject: [PATCH] x86: Get rid of 'dubious one-bit signed bitfield' sprase
 warning

This very noisy sparse warning appears on almost every file in the
kernel:

  CHECK   init/main.c
arch/x86/include/asm/thread_info.h:43:55: error: dubious one-bit signed bitfield
arch/x86/include/asm/thread_info.h:44:46: error: dubious one-bit signed bitfield

This patch changes sig_on_uaccess_error and uaccess_err flags to unsigned
type and thus fixes the warning.

Signed-off-by: Anton Vorontsov <cbouatmailru@...il.com>
---

Not sure why this warning is still there, as it spams the build process
a lot. I googled some discussion dated month ago... but no one sent a
patch?

http://www.spinics.net/lists/linux-kernel-janitors/msg10172.html

I went safest way, i.e. changing types to unsigned instead of bool/__u8.

 arch/x86/include/asm/thread_info.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 7404715..bc817cd 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -40,8 +40,8 @@ struct thread_info {
 						*/
 	__u8			supervisor_stack[0];
 #endif
-	int			sig_on_uaccess_error:1;
-	int			uaccess_err:1;	/* uaccess failed */
+	unsigned int		sig_on_uaccess_error:1;
+	unsigned int		uaccess_err:1;	/* uaccess failed */
 };
 
 #define INIT_THREAD_INFO(tsk)			\
-- 
1.7.7.3
--
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