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: bf50545696
"block: Introduce blk_revalidate_disk_zones()"
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -378,7 +378,7 @@ static struct blk_zone *blk_alloc_zones(int node, unsigned int *nr_zones)
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struct page *page;
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int order;
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for (order = get_order(size); order > 0; order--) {
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for (order = get_order(size); order >= 0; order--) {
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page = alloc_pages_node(node, GFP_NOIO | __GFP_ZERO, order);
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if (page) {
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*nr_zones = min_t(unsigned int, *nr_zones,
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