From: Milan Broz Date: Mon, 4 Sep 2006 13:37:57 +0000 (+0200) Subject: [PATCH] fix creating zero sized bio mempools in low memory system X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=50be345560f1ffdcb15cc0e146416b80529a2ef2;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [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: Milan Broz Signed-off-by: Jens Axboe --- diff --git a/fs/bio.c b/fs/bio.c index 6a0b9ad8f8c9..52de79c29942 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -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);