From 76f5bee5c3b45c617f91243e85547fc8f67bc678 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Thu, 5 Dec 2013 17:34:19 -0500 Subject: [PATCH] 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 Signed-off-by: Mike Snitzer Cc: stable@vger.kernel.org # 3.12+ --- drivers/md/dm-stats.c | 1 + 1 file changed, 1 insertion(+) 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; }