init: make initrd/initramfs decompression failure a KERN_EMERG event

Impact: More consistent behaviour, avoid policy in the kernel

Upgrade/downgrade initrd/initramfs decompression failure from
inconsistently a panic or a KERN_ALERT message to a KERN_EMERG event.
It is, however, possible do design a system which can recover from
this (using the kernel builtin code and/or the internal initramfs),
which means this is policy, not a technical necessity.

A good way to handle this would be to have a panic-level=X option, to
force a panic on a printk above a certain level.  That is a separate
patch, however.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2 files changed, 9 insertions, 5 deletions

diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 91d0cfca507..027a402708d 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -83,7 +83,8 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
                 printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
                        compress_name, start_block);
                 if (!*decompressor)
-                        printk(KERN_CRIT "RAMDISK: %s decompressor not configured!\n",
+                        printk(KERN_EMERG
+                               "RAMDISK: %s decompressor not configured!\n",
                                compress_name);
                 nblocks = 0;
                 goto done;
diff --git a/init/initramfs.c b/init/initramfs.c
index 9a7290ec818..7dcde7ea660 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -528,7 +528,7 @@ static int __init populate_rootfs(void)
         char *err = unpack_to_rootfs(__initramfs_start,
                          __initramfs_end - __initramfs_start, 0);
         if (err)
-                panic(err);
+                panic(err);     /* Failed to decompress INTERNAL initramfs */
         if (initrd_start) {
 #ifdef CONFIG_BLK_DEV_RAM
                 int fd;
@@ -554,9 +554,12 @@ static int __init populate_rootfs(void)
                 printk(KERN_INFO "Unpacking initramfs...");
                 err = unpack_to_rootfs((char *)initrd_start,
                         initrd_end - initrd_start, 0);
-                if (err)
-                        panic(err);
-                printk(" done\n");
+                if (err) {
+                        printk(" failed!\n");
+                        printk(KERN_EMERG "%s\n", err);
+                } else {
+                        printk(" done\n");
+                }
                 free_initrd();
 #endif
         }