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dm persistent data: fix memory allocation failure

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commit faada2174c upstream.

kmalloc is unreliable when allocating more than 8 pages of memory. It may
fail when there is plenty of free memory but the memory is fragmented.
Zdenek Kabelac observed such failure in his tests.

This commit changes kmalloc to kvmalloc - kvmalloc will fall back to
vmalloc if the large allocation fails.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reported-by: Zdenek Kabelac <zkabelac@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2024-08-13 16:35:14 +02:00 committed by Greg Kroah-Hartman
parent 00df2f4868
commit a6bba25f15
1 changed files with 2 additions and 2 deletions
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4
drivers/md/persistent-data/dm-space-map-metadata.c
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@ -277,7 +277,7 @@ static void sm_metadata_destroy(struct dm_space_map *sm)
{ {
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm); struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
kfree(smm); kvfree(smm);
} }
static int sm_metadata_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count) static int sm_metadata_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
@ -772,7 +772,7 @@ struct dm_space_map *dm_sm_metadata_init(void)
{ {
struct sm_metadata *smm; struct sm_metadata *smm;
smm = kmalloc(sizeof(*smm), GFP_KERNEL); smm = kvmalloc(sizeof(*smm), GFP_KERNEL);
if (!smm) if (!smm)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);