On 04/10/2019 16:05, Jens Axboe wrote: > On 10/4/19 4:07 AM, Pavel Begunkov (Silence) wrote: >> From: Pavel Begunkov <[email protected]> >> >> io_queue_link_head() accepts @force_nonblock flag, but io_ring_submit() >> passes something opposite. >> >> v2: fix build error by test robot: Rebase from custom tree >> Reported-by: kbuild test robot <[email protected]> >> >> Signed-off-by: Pavel Begunkov <[email protected]> >> --- >> fs/io_uring.c | 5 +++-- >> 1 file changed, 3 insertions(+), 2 deletions(-) >> >> diff --git a/fs/io_uring.c b/fs/io_uring.c >> index c934f91c51e9..c909ea2b84e9 100644 >> --- a/fs/io_uring.c >> +++ b/fs/io_uring.c >> @@ -2703,6 +2703,7 @@ static int io_ring_submit(struct io_ring_ctx *ctx, >> unsigned int to_submit, >> struct io_kiocb *shadow_req = NULL; >> bool prev_was_link = false; >> int i, submit = 0; >> + bool force_nonblock = true; >> >> if (to_submit > IO_PLUG_THRESHOLD) { >> io_submit_state_start(&state, ctx, to_submit); >> @@ -2710,9 +2711,9 @@ static int io_ring_submit(struct io_ring_ctx *ctx, >> unsigned int to_submit, >> } >> >> for (i = 0; i < to_submit; i++) { >> - bool force_nonblock = true; >> struct sqe_submit s; >> >> + force_nonblock = true; >> if (!io_get_sqring(ctx, &s)) >> break; >> >> @@ -2761,7 +2762,7 @@ static int io_ring_submit(struct io_ring_ctx *ctx, >> unsigned int to_submit, >> >> if (link) >> io_queue_link_head(ctx, link, &link->submit, shadow_req, >> - block_for_last); >> + force_nonblock); >> if (statep) >> io_submit_state_end(statep); > > Shouldn't this just be: > > io_queue_link_head(ctx, link, &link->submit, shadow_req, > !block_for_last); > > We're outside the loop, so by definition at the end of what we need to > do. We don't need to factor in the fiddling of force_nonblock here, > it'll be false at this point anyway. Only exception is error handling, > if the caller asked for more than what was in the ring. Not a big > deal...
Thanks for explaining this, I'll resend. Played safe because of breaks in the loop. -- Yours sincerely, Pavel Begunkov
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