This is a note to let you know that I've just added the patch titled
dm bufio: initialize read-only module parameters
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-bufio-initialize-read-only-module-parameters.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Thu, 5 Dec 2013 17:33:29 -0500
Subject: dm bufio: initialize read-only module parameters
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
commit 4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f upstream.
Some module parameters in dm-bufio are read-only. These parameters
inform the user about memory consumption. They are not supposed to be
changed by the user.
However, despite being read-only, these parameters can be set on
modprobe or insmod command line, for example:
modprobe dm-bufio current_allocated_bytes=12345
The kernel doesn't expect that these variables can be non-zero at module
initialization and if the user sets them, it results in BUG.
This patch initializes the variables in the module init routine, so that
user-supplied values are ignored.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-bufio.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1642,6 +1642,11 @@ static int __init dm_bufio_init(void)
{
__u64 mem;
+ dm_bufio_allocated_kmem_cache = 0;
+ dm_bufio_allocated_get_free_pages = 0;
+ dm_bufio_allocated_vmalloc = 0;
+ dm_bufio_current_allocated = 0;
+
memset(&dm_bufio_caches, 0, sizeof dm_bufio_caches);
memset(&dm_bufio_cache_names, 0, sizeof dm_bufio_cache_names);
Patches currently in stable-queue which might be from mpatocka@xxxxxxxxxx are
queue-3.4/dm-table-fail-dm_table_create-on-dm_round_up-overflow.patch
queue-3.4/dm-bufio-initialize-read-only-module-parameters.patch
queue-3.4/dm-delay-fix-a-possible-deadlock-due-to-shared-workqueue.patch
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