6.12-stable review patch. If anyone has any objections, please let me know.
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From: Caleb Sander Mateos csander@purestorage.com
[ Upstream commit c2f48453b7806d41f5a3270f206a5cd5640ed207 ]
struct ublk_device's __queues points to an allocation with up to UBLK_MAX_NR_QUEUES (4096) queues, each of which have: - struct ublk_queue (48 bytes) - Tail array of up to UBLK_MAX_QUEUE_DEPTH (4096) struct ublk_io's, 32 bytes each This means the full allocation can exceed 512 MB, which may well be impossible to service with contiguous physical pages. Switch to kvcalloc() and kvfree(), since there is no need for physically contiguous memory.
Signed-off-by: Caleb Sander Mateos csander@purestorage.com Fixes: 71f28f3136af ("ublk_drv: add io_uring based userspace block driver") Reviewed-by: Ming Lei ming.lei@redhat.com Link: https://lore.kernel.org/r/20250620151008.3976463-2-csander@purestorage.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/block/ublk_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 3b1a5cdd6311..defcc964ecab 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2116,7 +2116,7 @@ static void ublk_deinit_queues(struct ublk_device *ub)
for (i = 0; i < nr_queues; i++) ublk_deinit_queue(ub, i); - kfree(ub->__queues); + kvfree(ub->__queues); }
static int ublk_init_queues(struct ublk_device *ub) @@ -2127,7 +2127,7 @@ static int ublk_init_queues(struct ublk_device *ub) int i, ret = -ENOMEM;
ub->queue_size = ubq_size; - ub->__queues = kcalloc(nr_queues, ubq_size, GFP_KERNEL); + ub->__queues = kvcalloc(nr_queues, ubq_size, GFP_KERNEL); if (!ub->__queues) return ret;