linux-kernel - [PATCH 2/5] Use the existing offsetof() for VMCOREINFO

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Message-Id: <473D0163.5070602@mxs.nes.nec.co.jp>
Date:	Fri, 16 Nov 2007 11:33:07 +0900
From:	"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp>
To:	lkml <linux-kernel@...r.kernel.org>,
	kexec-ml <kexec@...ts.infradead.org>
Subject: [PATCH 2/5] Use the existing offsetof() for VMCOREINFO_OFFSET()


It is better that the existing offsetof() is used for VMCOREINFO_OFFSET().

This discussion is the following:
http://www.ussg.iu.edu/hypermail/linux/kernel/0709.3/0584.html

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	2007-11-12 11:03:31.000000000 +0900
+++ b/include/linux/kexec.h	2007-11-12 11:03:43.000000000 +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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