Commit 21482896 authored May 07, 2019 by Roman Gushchin Committed by Dennis Zhou May 09, 2019

io_uring: initialize percpu refcounters using PERCU_REF_ALLOW_REINIT



Percpu reference counters should now be initialized with the
PERCPU_REF_ALLOW_REINIT in order to allow switching them to the
percpu mode from the atomic mode. This is exactly what
percpu_ref_reinit() called from __io_uring_register() is supposed to
do. So let's initialize percpu refcounters with the
PERCU_REF_ALLOW_REINIT flag.

Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Dennis Zhou <dennis@kernel.org>

parent 09ed79d6

fs/io_uring.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -389,7 +389,8 @@ static struct io_ring_ctx io_ring_ctx_alloc(struct io_uring_params p)
		if (!ctx)
		return NULL;

		if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, 0, GFP_KERNEL)) {
		if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free,
		PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
		kfree(ctx);
		return NULL;
		}