From: Arjan van de Ven <arjan@linux.intel.com>
Date: Thu, 7 Dec 2006 04:37:19 +0000 (-0800)
Subject: [PATCH] Make initramfs printk a warning on incorrect cpio type
X-Git-Tag: v3.12-rc1~32283^2~14^2~176
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2e591bbc0d563e12f5a260fbbca0df7d5810910e;p=kernel%2Fkernel-generic.git

[PATCH] Make initramfs printk a warning on incorrect cpio type

It turns out that the "-c" option of cpio is highly unportable even between
distros let alone unix variants, and may actually make the wrong type of
cpio archive.  I just wasted quite some time on this, and the kernel can
detect this and warn about it (it's __init memory so it gets thrown away
and thus there is no runtime overhead)

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/init/initramfs.c b/init/initramfs.c
index d28c109..85f0403 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -182,6 +182,10 @@ static int __init do_collect(void)
 
 static int __init do_header(void)
 {
+	if (memcmp(collected, "070707", 6)==0) {
+		error("incorrect cpio method used: use -H newc option");
+		return 1;
+	}
 	if (memcmp(collected, "070701", 6)) {
 		error("no cpio magic");
 		return 1;