From 927b6b2d69b4cc900fa50d7e46d8f1fa91c91b3a Mon Sep 17 00:00:00 2001 From: Shin'ichiro Kawasaki Date: Tue, 11 Dec 2018 21:08:26 +0900 Subject: block: Fix null_blk_zoned creation failure with small number of zones null_blk_zoned creation fails if the number of zones specified is equal to or is smaller than 64 due to a memory allocation failure in blk_alloc_zones(). With such a small number of zones, the required memory size for all zones descriptors fits in a single page, and the page order for alloc_pages_node() is zero. Allow this value in blk_alloc_zones() for the allocation to succeed. Fixes: bf5054569653 "block: Introduce blk_revalidate_disk_zones()" Reviewed-by: Damien Le Moal Signed-off-by: Shin'ichiro Kawasaki Signed-off-by: Jens Axboe --- block/blk-zoned.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 13ba2011a306..a327bef07642 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -378,7 +378,7 @@ static struct blk_zone *blk_alloc_zones(int node, unsigned int *nr_zones) struct page *page; int order; - for (order = get_order(size); order > 0; order--) { + for (order = get_order(size); order >= 0; order--) { page = alloc_pages_node(node, GFP_NOIO | __GFP_ZERO, order); if (page) { *nr_zones = min_t(unsigned int, *nr_zones, -- cgit v1.2.3