Re: [PATCH] io_uring: Fix reversed nonblock flag

[kbuild test robot]

Hi "Pavel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.4-rc1 next-20191004]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Pavel-Begunkov-Silence/io_uring-Fix-reversed-nonblock-flag/20191004-163432
config: m68k-allyesconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   fs/io_uring.c: In function 'io_ring_submit':
>> fs/io_uring.c:2764:6: error: 'force_nonblock' undeclared (first use in this function); did you mean 'tcf_block'?
         force_nonblock);
         ^~~~~~~~~~~~~~
         tcf_block
   fs/io_uring.c:2764:6: note: each undeclared identifier is reported only once for each function it appears in

vim +2764 fs/io_uring.c

  2697	
  2698	static int io_ring_submit(struct io_ring_ctx *ctx, unsigned int to_submit,
  2699				  bool block_for_last)
  2700	{
  2701		struct io_submit_state state, *statep = NULL;
  2702		struct io_kiocb *link = NULL;
  2703		struct io_kiocb *shadow_req = NULL;
  2704		bool prev_was_link = false;
  2705		int i, submit = 0;
  2706	
  2707		if (to_submit > IO_PLUG_THRESHOLD) {
  2708			io_submit_state_start(&state, ctx, to_submit);
  2709			statep = &state;
  2710		}
  2711	
  2712		for (i = 0; i < to_submit; i++) {
  2713			bool force_nonblock = true;
  2714			struct sqe_submit s;
  2715	
  2716			if (!io_get_sqring(ctx, &s))
  2717				break;
  2718	
  2719			/*
  2720			 * If previous wasn't linked and we have a linked command,
  2721			 * that's the end of the chain. Submit the previous link.
  2722			 */
  2723			if (!prev_was_link && link) {
  2724				io_queue_link_head(ctx, link, &link->submit, shadow_req,
  2725							force_nonblock);
  2726				link = NULL;
  2727				shadow_req = NULL;
  2728			}
  2729			prev_was_link = (s.sqe->flags & IOSQE_IO_LINK) != 0;
  2730	
  2731			if (link && (s.sqe->flags & IOSQE_IO_DRAIN)) {
  2732				if (!shadow_req) {
  2733					shadow_req = io_get_req(ctx, NULL);
  2734					if (unlikely(!shadow_req))
  2735						goto out;
  2736					shadow_req->flags |= (REQ_F_IO_DRAIN | REQ_F_SHADOW_DRAIN);
  2737					refcount_dec(&shadow_req->refs);
  2738				}
  2739				shadow_req->sequence = s.sequence;
  2740			}
  2741	
  2742	out:
  2743			s.has_user = true;
  2744			s.needs_lock = false;
  2745			s.needs_fixed_file = false;
  2746			submit++;
  2747	
  2748			/*
  2749			 * The caller will block for events after submit, submit the
  2750			 * last IO non-blocking. This is either the only IO it's
  2751			 * submitting, or it already submitted the previous ones. This
  2752			 * improves performance by avoiding an async punt that we don't
  2753			 * need to do.
  2754			 */
  2755			if (block_for_last && submit == to_submit)
  2756				force_nonblock = false;
  2757	
  2758			io_submit_sqe(ctx, &s, statep, &link, force_nonblock);
  2759		}
  2760		io_commit_sqring(ctx);
  2761	
  2762		if (link)
  2763			io_queue_link_head(ctx, link, &link->submit, shadow_req,
> 2764						force_nonblock);
  2765		if (statep)
  2766			io_submit_state_end(statep);
  2767	
  2768		return submit;
  2769	}
  2770	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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