linux-kernel - [PATCH 6/4] [-mm patch] use the existing offsetof().

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Date:	Thu, 20 Sep 2007 14:32:11 +0900
From:	"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Adrian Bunk <bunk@...nel.org>,
	kexec-ml <kexec@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joe Perches <joe@...ches.com>
Subject: [PATCH 6/4] [-mm patch] use the existing offsetof().


[PATCH 6/4] [-mm patch] use the existing offsetof().
 It is better that offsetof() is used for VMCOREINFO_OFFSET().
 This idea is Joe Perches's.



Thanks
Ken'ichi Ohmichi 

---
Signed-off-by: Joe Perches <joe@...ches.com>
Signed-off-by: Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>
---
diff -rpuN a/include/linux/kexec.h b/include/linux/kexec.h
--- a/include/linux/kexec.h	2007-09-18 15:23:22.000000000 +0900
+++ b/include/linux/kexec.h	2007-09-18 15:27:29.000000000 +0900
@@ -137,7 +137,7 @@ unsigned long paddr_vmcoreinfo_note(void
 			      (unsigned long)sizeof(struct name))
 #define VMCOREINFO_OFFSET(name, field) \
 	vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
-			      (unsigned long)&(((struct name *)0)->field))
+			      (unsigned long)offsetof(struct name, field))
 #define VMCOREINFO_LENGTH(name, value) \
 	vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
 #define VMCOREINFO_NUMBER(name) \
_

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