Hi "Uladzislau, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on rcu/dev] [also build test WARNING on linux/master linus/master v5.12-rc2 next-20210305] [cannot apply to hnaz-linux-mm/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Uladzislau-Rezki-Sony/kvfree_rcu-Release-a-page-cache-under-memory-pressure/20210309-035155 base: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev config: riscv-randconfig-r002-20210309 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 3a11a41795bec548e91621caaa4cc00fc31b2212) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/d1c3a54d06b2b088b2a7b4e7f2a0a85bcbfbf53a git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Uladzislau-Rezki-Sony/kvfree_rcu-Release-a-page-cache-under-memory-pressure/20210309-035155 git checkout d1c3a54d06b2b088b2a7b4e7f2a0a85bcbfbf53a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> kernel/rcu/tree.c:3518:7: warning: variable '__ret' is uninitialized when used here [-Wuninitialized] if (xchg(&backoff_page_cache_fill, false)) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/cmpxchg.h:146:23: note: expanded from macro 'xchg' (__typeof__(*(ptr))) __xchg((ptr), _x_, sizeof(*(ptr))); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/asm/cmpxchg.h:140:2: note: expanded from macro '__xchg' __ret; \ ^~~~~ kernel/rcu/tree.c:3518:7: note: variable '__ret' is declared here arch/riscv/include/asm/cmpxchg.h:146:23: note: expanded from macro 'xchg' (__typeof__(*(ptr))) __xchg((ptr), _x_, sizeof(*(ptr))); \ ^ arch/riscv/include/asm/cmpxchg.h:121:2: note: expanded from macro '__xchg' __typeof__(*(ptr)) __ret; \ ^ 1 warning generated. vim +/__ret +3518 kernel/rcu/tree.c 3512 3513 static void 3514 run_page_cache_worker(struct kfree_rcu_cpu *krcp) 3515 { 3516 if (rcu_scheduler_active == RCU_SCHEDULER_RUNNING && 3517 !atomic_xchg(&krcp->work_in_progress, 1)) { > 3518 if (xchg(&backoff_page_cache_fill, false)) { 3519 queue_delayed_work(system_wq, 3520 &krcp->page_cache_work, PAGE_CACHE_FILL_DELAY); 3521 } else { 3522 hrtimer_init(&krcp->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 3523 krcp->hrtimer.function = schedule_page_work_fn; 3524 hrtimer_start(&krcp->hrtimer, 0, HRTIMER_MODE_REL); 3525 } 3526 } 3527 } 3528 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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