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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+
hifive-unleashed-5.1
Mikulas Patocka 2013-12-05 17:34:19 -05:00 committed by Mike Snitzer
parent 4cb57ab4a2
commit 76f5bee5c3
1 changed files with 1 additions and 0 deletions
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drivers/md/dm-stats.c
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@ -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;
}