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Subject[PATCH 2/4] io_uring: initialize percpu refcounters using PERCU_REF_ALLOW_REINIT
Date
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>
---
fs/io_uring.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 452e35357865..9a9df175af31 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -397,7 +397,8 @@ 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;
}
--
2.20.1
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