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| author | Mikulas Patocka <mpatocka@redhat.com> | 2013-12-05 23:33:29 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-12-11 01:13:20 +0100 |
| commit | 4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f (patch) | |
| tree | f9060e86cc23801b02bfa98db5bf0f59206b2b93 /drivers/md/dm-bufio.c | |
| parent | dm cache: actually resize cache (diff) | |
| download | linux-4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f.tar.xz linux-4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f.zip | |
dm bufio: initialize read-only module parameters
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@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 3.2+
Diffstat (limited to 'drivers/md/dm-bufio.c')
| -rw-r--r-- | drivers/md/dm-bufio.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index 173cbb20d104..54bdd923316f 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -1717,6 +1717,11 @@ 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); |