Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
io_uring/poll: cache req->apoll_events
Avoid a potential reload of ->apoll_events post vfs_poll() by caching it
in a local variable.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
+5
-3
+5
-3
io_uring/poll.c
+5
-3
io_uring/poll.c
···
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/* the mask was stashed in __io_poll_execute */
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if (!req->cqe.res) {
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-
struct poll_table_struct pt = { ._key = req->apoll_events };
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-
req->cqe.res = vfs_poll(req->file, &pt) & req->apoll_events;
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+
__poll_t events = req->apoll_events;
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+
struct poll_table_struct pt = { ._key = events };
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+
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req->cqe.res = vfs_poll(req->file, &pt) & events;
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/*
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* We got woken with a mask, but someone else got to
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* it first. The above vfs_poll() doesn't add us back
···
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*/
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if (unlikely(!req->cqe.res)) {
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/* Multishot armed need not reissue */
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-
if (!(req->apoll_events & EPOLLONESHOT))
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+
if (!(events & EPOLLONESHOT))
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continue;
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return IOU_POLL_REISSUE;
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}