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io_uring: use constants for cq_overflow bitfield
Prepare to use this bitfield for more flags by using constants instead of magic value 0 Signed-off-by: Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220421091345.2115755-5-dylany@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -431,7 +431,7 @@ struct io_ring_ctx {
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struct wait_queue_head sqo_sq_wait;
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struct list_head sqd_list;
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unsigned long check_cq_overflow;
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unsigned long check_cq;
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struct {
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/*
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@ -903,6 +903,10 @@ struct io_cqe {
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};
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};
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enum {
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IO_CHECK_CQ_OVERFLOW_BIT,
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};
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/*
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* NOTE! Each of the iocb union members has the file pointer
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* as the first entry in their struct definition. So you can
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@ -2024,7 +2028,7 @@ static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
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all_flushed = list_empty(&ctx->cq_overflow_list);
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if (all_flushed) {
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clear_bit(0, &ctx->check_cq_overflow);
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clear_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq);
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WRITE_ONCE(ctx->rings->sq_flags,
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ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW);
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}
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@ -2040,7 +2044,7 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx)
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{
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bool ret = true;
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if (test_bit(0, &ctx->check_cq_overflow)) {
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if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) {
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/* iopoll syncs against uring_lock, not completion_lock */
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if (ctx->flags & IORING_SETUP_IOPOLL)
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mutex_lock(&ctx->uring_lock);
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@ -2118,7 +2122,7 @@ static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
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return false;
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}
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if (list_empty(&ctx->cq_overflow_list)) {
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set_bit(0, &ctx->check_cq_overflow);
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set_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq);
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WRITE_ONCE(ctx->rings->sq_flags,
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ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW);
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@ -2960,7 +2964,7 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
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* If we do, we can potentially be spinning for commands that
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* already triggered a CQE (eg in error).
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*/
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if (test_bit(0, &ctx->check_cq_overflow))
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if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
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__io_cqring_overflow_flush(ctx, false);
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if (io_cqring_events(ctx))
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return 0;
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@ -8300,7 +8304,8 @@ static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode,
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* Cannot safely flush overflowed CQEs from here, ensure we wake up
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* the task, and the next invocation will do it.
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*/
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if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow))
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if (io_should_wake(iowq) ||
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test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &iowq->ctx->check_cq))
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return autoremove_wake_function(curr, mode, wake_flags, key);
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return -1;
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}
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@ -8328,7 +8333,7 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
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if (ret || io_should_wake(iowq))
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return ret;
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/* let the caller flush overflows, retry */
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if (test_bit(0, &ctx->check_cq_overflow))
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if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
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return 1;
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if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS))
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@ -10123,7 +10128,8 @@ static __poll_t io_uring_poll(struct file *file, poll_table *wait)
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* Users may get EPOLLIN meanwhile seeing nothing in cqring, this
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* pushs them to do the flush.
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*/
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if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow))
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if (io_cqring_events(ctx) ||
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test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))
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mask |= EPOLLIN | EPOLLRDNORM;
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return mask;
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