[ 3.5.y.z extended stable ] Patch "tile: expect new initramfs name from hypervisor file system" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    tile: expect new initramfs name from hypervisor file system

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From fd7a0c6e8938e4cfd2d7d0dd5fdcfb9713bf3114 Mon Sep 17 00:00:00 2001
From: Chris Metcalf <cmetcalf at tilera.com>
Date: Fri, 29 Mar 2013 13:50:21 -0400
Subject: [PATCH] tile: expect new initramfs name from hypervisor file system

commit ff7f3efb9abf986f4ecd8793a9593f7ca4d6431a upstream.

The current Tilera boot infrastructure now provides the initramfs
to Linux as a Tilera-hypervisor file named "initramfs", rather than
"initramfs.cpio.gz", as before.  (This makes it reasonable to use
other compression techniques than gzip on the file without having to
worry about the name causing confusion.)  Adapt to use the new name,
but also fall back to checking for the old name.

Cc'ing to stable so that older kernels will remain compatible with
newer Tilera boot infrastructure.

Signed-off-by: Chris Metcalf <cmetcalf at tilera.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 arch/tile/kernel/setup.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index dd87f34..3d2190b 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -990,15 +990,8 @@ void __cpuinit setup_cpu(int boot)

 #ifdef CONFIG_BLK_DEV_INITRD

-/*
- * Note that the kernel can potentially support other compression
- * techniques than gz, though we don't do so by default.  If we ever
- * decide to do so we can either look for other filename extensions,
- * or just allow a file with this name to be compressed with an
- * arbitrary compressor (somewhat counterintuitively).
- */
 static int __initdata set_initramfs_file;
-static char __initdata initramfs_file[128] = "initramfs.cpio.gz";
+static char __initdata initramfs_file[128] = "initramfs";

 static int __init setup_initramfs_file(char *str)
 {
@@ -1012,9 +1005,9 @@ static int __init setup_initramfs_file(char *str)
 early_param("initramfs_file", setup_initramfs_file);

 /*
- * We look for an "initramfs.cpio.gz" file in the hvfs.
- * If there is one, we allocate some memory for it and it will be
- * unpacked to the initramfs.
+ * We look for a file called "initramfs" in the hvfs.  If there is one, we
+ * allocate some memory for it and it will be unpacked to the initramfs.
+ * If it's compressed, the initd code will uncompress it first.
  */
 static void __init load_hv_initrd(void)
 {
@@ -1024,10 +1017,16 @@ static void __init load_hv_initrd(void)

 	fd = hv_fs_findfile((HV_VirtAddr) initramfs_file);
 	if (fd == HV_ENOENT) {
-		if (set_initramfs_file)
+		if (set_initramfs_file) {
 			pr_warning("No such hvfs initramfs file '%s'\n",
 				   initramfs_file);
-		return;
+			return;
+		} else {
+			/* Try old backwards-compatible name. */
+			fd = hv_fs_findfile((HV_VirtAddr)"initramfs.cpio.gz");
+			if (fd == HV_ENOENT)
+				return;
+		}
 	}
 	BUG_ON(fd < 0);
 	stat = hv_fs_fstat(fd);
--
1.8.1.2