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io_uring: minor io_cqring_wait() optimization 

Move up the block manipulating the sig variable to execute code
that may encounter an error and exit first before continuing
executing the rest of the function and avoid useless computations

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/84513f7cc1b1fb31d8f4cb910aee033391d036b4.1646777484.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Olivier Langlois 2022-03-08 17:17:21 -05:00 committed by Jens Axboe
parent 4f57f06ce2
commit 950e79dd73
1 changed files with 8 additions and 8 deletions
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16
fs/io_uring.c
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@ -7919,14 +7919,6 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
break;
} while (1);
if (uts) {
struct timespec64 ts;
if (get_timespec64(&ts, uts))
return -EFAULT;
timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
}
if (sig) {
#ifdef CONFIG_COMPAT
if (in_compat_syscall())
@ -7940,6 +7932,14 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
return ret;
}
if (uts) {
struct timespec64 ts;
if (get_timespec64(&ts, uts))
return -EFAULT;
timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
}
init_waitqueue_func_entry(&iowq.wq, io_wake_function);
iowq.wq.private = current;
INIT_LIST_HEAD(&iowq.wq.entry);