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authorMikulas Patocka <mpatocka@redhat.com>2013-12-05 17:34:19 -0500
committerMike Snitzer <snitzer@redhat.com>2013-12-10 19:13:21 -0500
commit76f5bee5c3b45c617f91243e85547fc8f67bc678 (patch)
treeac768fd2a42dad32d090694345cb0bf4277789c2
parent4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f (diff)
downloadlinux-76f5bee5c3b45c617f91243e85547fc8f67bc678.tar.bz2
dm stats: initialize read-only module parameter
The module parameter stats_current_allocated_bytes in dm-mod is read-only. This parameter informs the user about memory consumption. It is not supposed to be changed by the user. However, despite being read-only, this parameter can be set on modprobe or insmod command line: modprobe dm-mod stats_current_allocated_bytes=12345 The kernel doesn't expect that this variable can be non-zero at module initialization and if the user sets it, it results in warning. This patch initializes the variable in the module init routine, so that user-supplied value is ignored. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org # 3.12+
-rw-r--r--drivers/md/dm-stats.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 3d404c1371ed..28a90122a5a8 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -964,6 +964,7 @@ int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv,
int __init dm_statistics_init(void)
{
+ shared_memory_amount = 0;
dm_stat_need_rcu_barrier = 0;
return 0;
}