dm-stats: initialize read-only module parameters
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 initializates the variable in the module init routine, so that
user-supplied value is ignored.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxx # 3.12+
---
drivers/md/dm-bufio.c | 5 +++++
drivers/md/dm-stats.c | 1 +
2 files changed, 6 insertions(+)
Index: linux-3.13-rc2/drivers/md/dm-stats.c
===================================================================
--- linux-3.13-rc2.orig/drivers/md/dm-stats.c 2013-12-05 23:08:37.000000000 +0100
+++ linux-3.13-rc2/drivers/md/dm-stats.c 2013-12-05 23:09:00.000000000 +0100
@@ -964,6 +964,7 @@ int dm_stats_message(struct mapped_devic
int __init dm_statistics_init(void)
{
+ shared_memory_amount = 0;
dm_stat_need_rcu_barrier = 0;
return 0;
}
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