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authorDaniel M. Weeks <dan@danweeks.net>2014-04-07 15:39:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 16:36:11 -0700
commit6aa7a29aa8378fa868fabef6a84b0a40d5d9d677 (patch)
tree42db878266aeaa77a8af91d3ddbbdc8ece3f83a1
parent16caed319604609a5579df132fce362a456170d7 (diff)
downloadkernel-6aa7a29aa8378fa868fabef6a84b0a40d5d9d677.tar.gz
initramfs: debug detected compression method
This can greatly aid in narrowing down the real source of initramfs problems such as failures related to the compression of the in-kernel initramfs when an external initramfs is in use as well. Existing errors are ambiguous as to which initramfs is a problem and why. [akpm@linux-foundation.org: use pr_debug()] Signed-off-by: Daniel M. Weeks <dan@danweeks.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--init/initramfs.c1
-rw-r--r--lib/decompress.c3
2 files changed, 4 insertions, 0 deletions
diff --git a/init/initramfs.c b/init/initramfs.c
index 93b61396756b..a8497fab1c3d 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -455,6 +455,7 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len)
}
this_header = 0;
decompress = decompress_method(buf, len, &compress_name);
+ pr_debug("Detected %s compressed data\n", compress_name);
if (decompress) {
res = decompress(buf, len, NULL, flush_buffer, NULL,
&my_inptr, error);
diff --git a/lib/decompress.c b/lib/decompress.c
index 4d1cd0397aab..86069d74c062 100644
--- a/lib/decompress.c
+++ b/lib/decompress.c
@@ -16,6 +16,7 @@
#include <linux/types.h>
#include <linux/string.h>
#include <linux/init.h>
+#include <linux/printk.h>
#ifndef CONFIG_DECOMPRESS_GZIP
# define gunzip NULL
@@ -61,6 +62,8 @@ decompress_fn __init decompress_method(const unsigned char *inbuf, int len,
if (len < 2)
return NULL; /* Need at least this much... */
+ pr_debug("Compressed data magic: %#.2x %#.2x\n", inbuf[0], inbuf[1]);
+
for (cf = compressed_formats; cf->name; cf++) {
if (!memcmp(inbuf, cf->magic, 2))
break;