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

[Ken'ichi Ohmichi]

[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 at perches.com>
Signed-off-by: Ken'ichi Ohmichi <oomichi at mxs.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) \
_