Commit 50be3455 authored by Milan Broz's avatar Milan Broz Committed by Jens Axboe

[PATCH] fix creating zero sized bio mempools in low memory system

In the very low memory systems is in the init_bio call
scale parameter set to zero and it leads to creating
zero sized mempool.

This patch prevents pool_entries parameter become zero,
so the created pool have at least 1 entry.

Mempool with 0 entries lead to incorrect behaviour
of mempool_free. (Alloc requests are not waken up
and system stalls in mempool_alloc->ioschedule).
Signed-off-by: default avatarMilan Broz <>
Signed-off-by: default avatarJens Axboe <>
parent bcfd8d36
......@@ -1142,7 +1142,7 @@ static int biovec_create_pools(struct bio_set *bs, int pool_entries, int scale)
struct biovec_slab *bp = bvec_slabs + i;
mempool_t **bvp = bs->bvec_pools + i;
if (i >= scale)
if (pool_entries > 1 && i >= scale)
pool_entries >>= 1;
*bvp = mempool_create_slab_pool(pool_entries, bp->slab);
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