Evolution-X-Devices/kernel_samsung_a71
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dm persistent data: fix memory allocation failure

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commit faada2174c08662ae98b439c69efe3e79382c538 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>
(cherry picked from commit 90a6b797e95d0f4bef30fbab423759f4e9999506)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Mikulas Patocka
2024-08-13 16:35:14 +02:00
committed by Vegard Nossum
parent ceb3e3f9e1
commit 058be20653
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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@@ -274,7 +274,7 @@ static void sm_metadata_destroy(struct dm_space_map *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)
@@ -758,7 +758,7 @@ struct dm_space_map *dm_sm_metadata_init(void)
{
struct sm_metadata *smm;
smm = kmalloc(sizeof(*smm), GFP_KERNEL);
smm = kvmalloc(sizeof(*smm), GFP_KERNEL);
if (!smm)
return ERR_PTR(-ENOMEM);