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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>
This commit is contained in:
Roman Gushchin 2019-05-07 10:01:48 -07:00 committed by Dennis Zhou
parent 09ed79d6d7
commit 214828962d
1 changed files with 2 additions and 1 deletions
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3
fs/io_uring.c
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@ -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;
}