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io_uring: clean up io_ring_ctx_alloc

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Add a variable for the number of hash buckets in io_ring_ctx_alloc(),
makes it more readable.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/993926ed0d614ba9a76b2a85bebae2babcb13983.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-06-16 10:22:06 +01:00 committed by Jens Axboe
parent 4a07723fb4
commit 8b1dfd343a
1 changed files with 6 additions and 4 deletions
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10
io_uring/io_uring.c
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@ -244,6 +244,8 @@ static __cold void io_fallback_req_func(struct work_struct *work)
static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
{
struct io_ring_ctx *ctx;
unsigned hash_buckets;
size_t hash_size;
int hash_bits;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@ -259,15 +261,15 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
*/
hash_bits = ilog2(p->cq_entries) - 5;
hash_bits = clamp(hash_bits, 1, 8);
hash_buckets = 1U << hash_bits;
hash_size = hash_buckets * sizeof(struct io_hash_bucket);
ctx->cancel_hash_bits = hash_bits;
ctx->cancel_hash =
kmalloc((1U << hash_bits) * sizeof(struct io_hash_bucket),
GFP_KERNEL);
ctx->cancel_hash = kmalloc(hash_size, GFP_KERNEL);
if (!ctx->cancel_hash)
goto err;
init_hash_table(ctx->cancel_hash, 1U << hash_bits);
init_hash_table(ctx->cancel_hash, hash_buckets);
ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL);
if (!ctx->dummy_ubuf)