Hi Jens, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 01f856ae6d0ca5ad0505b79bf2d22d7ca439b2a1 commit: ed29b0b4fd835b058ddd151c49d021e28d631ee6 io_uring: move to separate directory date: 4 months ago config: x86_64-sof-customedconfig-amd-defconfig compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ed29b0b4fd835b058ddd151c49d021e28d631ee6 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ed29b0b4fd835b058ddd151c49d021e28d631ee6 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All errors (new ones prefixed by >>): io_uring/io_uring.c: In function '__io_submit_flush_completions': >> io_uring/io_uring.c:2932:40: error: variable 'prev' set but not used [-Werror=unused-but-set-variable] 2932 | struct io_wq_work_node *node, *prev; | ^~~~ cc1: all warnings being treated as errors vim +/prev +2932 io_uring/io_uring.c 7a743e225b2a9d fs/io_uring.c Pavel Begunkov 2020-03-03 2928 c450178d9be9dc fs/io_uring.c Pavel Begunkov 2021-09-08 2929 static void __io_submit_flush_completions(struct io_ring_ctx *ctx) a141dd896f544d fs/io_uring.c Jens Axboe 2021-08-12 2930 __must_hold(&ctx->uring_lock) 905c172f32c56f fs/io_uring.c Pavel Begunkov 2021-02-10 2931 { 6f33b0bc4ea43f fs/io_uring.c Pavel Begunkov 2021-09-24 @2932 struct io_wq_work_node *node, *prev; cd0ca2e048dc0d fs/io_uring.c Pavel Begunkov 2021-08-09 2933 struct io_submit_state *state = &ctx->submit_state; 905c172f32c56f fs/io_uring.c Pavel Begunkov 2021-02-10 2934 3d4aeb9f98058c fs/io_uring.c Pavel Begunkov 2021-11-10 2935 if (state->flush_cqes) { 79ebeaee8a21a0 fs/io_uring.c Jens Axboe 2021-08-10 2936 spin_lock(&ctx->completion_lock); 6f33b0bc4ea43f fs/io_uring.c Pavel Begunkov 2021-09-24 2937 wq_list_for_each(node, prev, &state->compl_reqs) { 6f33b0bc4ea43f fs/io_uring.c Pavel Begunkov 2021-09-24 2938 struct io_kiocb *req = container_of(node, struct io_kiocb, 6f33b0bc4ea43f fs/io_uring.c Pavel Begunkov 2021-09-24 2939 comp_list); 5182ed2e332e8e fs/io_uring.c Pavel Begunkov 2021-06-26 2940 f43de1f88841d5 fs/io_uring.c Pavel Begunkov 2022-06-15 2941 if (!(req->flags & REQ_F_CQE_SKIP)) 91ef75a7db0d08 fs/io_uring.c Pavel Begunkov 2022-06-15 2942 __io_fill_cqe_req(ctx, req); 905c172f32c56f fs/io_uring.c Pavel Begunkov 2021-02-10 2943 } 3d4aeb9f98058c fs/io_uring.c Pavel Begunkov 2021-11-10 2944 905c172f32c56f fs/io_uring.c Pavel Begunkov 2021-02-10 2945 io_commit_cqring(ctx); 79ebeaee8a21a0 fs/io_uring.c Jens Axboe 2021-08-10 2946 spin_unlock(&ctx->completion_lock); 905c172f32c56f fs/io_uring.c Pavel Begunkov 2021-02-10 2947 io_cqring_ev_posted(ctx); 3d4aeb9f98058c fs/io_uring.c Pavel Begunkov 2021-11-10 2948 state->flush_cqes = false; 3d4aeb9f98058c fs/io_uring.c Pavel Begunkov 2021-11-10 2949 } 5182ed2e332e8e fs/io_uring.c Pavel Begunkov 2021-06-26 2950 1cce17aca621c3 fs/io_uring.c Pavel Begunkov 2021-09-24 2951 io_free_batch_list(ctx, state->compl_reqs.first); 6f33b0bc4ea43f fs/io_uring.c Pavel Begunkov 2021-09-24 2952 INIT_WQ_LIST(&state->compl_reqs); 7a743e225b2a9d fs/io_uring.c Pavel Begunkov 2020-03-03 2953 } 7a743e225b2a9d fs/io_uring.c Pavel Begunkov 2020-03-03 2954 :::::: The code at line 2932 was first introduced by commit :::::: 6f33b0bc4ea43f5c5ce7b7c9ab66051f80837862 io_uring: use slist for completion batching :::::: TO: Pavel Begunkov :::::: CC: Jens Axboe -- 0-DAY CI Kernel Test Service https://01.org/lkp