Hi Zi, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fff5a5e7f528b2ed2c335991399a766c2cf01103 commit: 0192445cb2f7ed1cd7a95a0fc8c7645480baba25 arch: mm: rename FORCE_MAX_ZONEORDER to ARCH_FORCE_MAX_ORDER date: 6 months ago config: sparc-randconfig-r005-20230322 (https://download.01.org/0day-ci/archive/20230323/202303231958.9lByNCPW-lkp@xxxxxxxxx/config) compiler: sparc-linux-gcc (GCC) 12.1.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0192445cb2f7ed1cd7a95a0fc8c7645480baba25 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 0192445cb2f7ed1cd7a95a0fc8c7645480baba25 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash drivers/base/regmap/ drivers/virtio/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202303231958.9lByNCPW-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from include/linux/gfp.h:7, from include/linux/mm.h:7, from include/linux/scatterlist.h:8, from include/linux/virtio.h:7, from drivers/virtio/virtio_balloon.c:9: include/linux/mmzone.h:636:33: error: size of array 'free_area' is negative 636 | struct free_area free_area[MAX_ORDER]; | ^~~~~~~~~ In file included from include/linux/math64.h:6, from include/linux/time64.h:5, from include/linux/restart_block.h:10, from include/linux/thread_info.h:14, from include/asm-generic/preempt.h:5, from ./arch/sparc/include/generated/asm/preempt.h:1, from include/linux/preempt.h:78, from include/linux/spinlock.h:55, from include/linux/mmzone.h:8: drivers/virtio/virtio_balloon.c: In function 'shrink_free_pages': >> drivers/virtio/virtio_balloon.c:40:44: warning: left shift count is negative [-Wshift-count-negative] 40 | #define VIRTIO_BALLOON_HINT_BLOCK_PAGES (1 << VIRTIO_BALLOON_HINT_BLOCK_ORDER) | ^~ include/linux/math.h:15:46: note: in definition of macro '__round_mask' 15 | #define __round_mask(x, y) ((__typeof__(x))((y)-1)) | ^ drivers/virtio/virtio_balloon.c:808:25: note: in expansion of macro 'round_up' 808 | pages_to_free = round_up(pages_to_free, | ^~~~~~~~ drivers/virtio/virtio_balloon.c:809:34: note: in expansion of macro 'VIRTIO_BALLOON_HINT_BLOCK_PAGES' 809 | VIRTIO_BALLOON_HINT_BLOCK_PAGES); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/virtio/virtio_balloon.c:40:44: warning: left shift count is negative [-Wshift-count-negative] 40 | #define VIRTIO_BALLOON_HINT_BLOCK_PAGES (1 << VIRTIO_BALLOON_HINT_BLOCK_ORDER) | ^~ drivers/virtio/virtio_balloon.c:810:42: note: in expansion of macro 'VIRTIO_BALLOON_HINT_BLOCK_PAGES' 810 | blocks_to_free = pages_to_free / VIRTIO_BALLOON_HINT_BLOCK_PAGES; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> drivers/virtio/virtio_balloon.c:40:44: warning: left shift count is negative [-Wshift-count-negative] 40 | #define VIRTIO_BALLOON_HINT_BLOCK_PAGES (1 << VIRTIO_BALLOON_HINT_BLOCK_ORDER) | ^~ drivers/virtio/virtio_balloon.c:813:31: note: in expansion of macro 'VIRTIO_BALLOON_HINT_BLOCK_PAGES' 813 | return blocks_freed * VIRTIO_BALLOON_HINT_BLOCK_PAGES; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/virtio/virtio_balloon.c: In function 'virtio_balloon_shrinker_count': >> drivers/virtio/virtio_balloon.c:40:44: warning: left shift count is negative [-Wshift-count-negative] 40 | #define VIRTIO_BALLOON_HINT_BLOCK_PAGES (1 << VIRTIO_BALLOON_HINT_BLOCK_ORDER) | ^~ drivers/virtio/virtio_balloon.c:831:43: note: in expansion of macro 'VIRTIO_BALLOON_HINT_BLOCK_PAGES' 831 | return vb->num_free_page_blocks * VIRTIO_BALLOON_HINT_BLOCK_PAGES; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/gfp.h:7, from include/linux/slab.h:15, from drivers/base/regmap/regmap-debugfs.c:9: include/linux/mmzone.h:636:33: error: size of array 'free_area' is negative 636 | struct free_area free_area[MAX_ORDER]; | ^~~~~~~~~ drivers/base/regmap/regmap-debugfs.c: In function 'regmap_read_debugfs': >> drivers/base/regmap/regmap-debugfs.c:229:32: warning: left shift count is negative [-Wshift-count-negative] 229 | if (count > (PAGE_SIZE << (MAX_ORDER - 1))) | ^~ drivers/base/regmap/regmap-debugfs.c:230:35: warning: left shift count is negative [-Wshift-count-negative] 230 | count = PAGE_SIZE << (MAX_ORDER - 1); | ^~ drivers/base/regmap/regmap-debugfs.c: In function 'regmap_reg_ranges_read_file': drivers/base/regmap/regmap-debugfs.c:376:32: warning: left shift count is negative [-Wshift-count-negative] 376 | if (count > (PAGE_SIZE << (MAX_ORDER - 1))) | ^~ drivers/base/regmap/regmap-debugfs.c:377:35: warning: left shift count is negative [-Wshift-count-negative] 377 | count = PAGE_SIZE << (MAX_ORDER - 1); | ^~ vim +40 drivers/virtio/virtio_balloon.c 5a10b7dbf904bf Raushaniya Maksudova 2014-11-10 32 86a559787e6f5c Wei Wang 2018-08-27 33 #define VIRTIO_BALLOON_FREE_PAGE_ALLOC_FLAG (__GFP_NORETRY | __GFP_NOWARN | \ 86a559787e6f5c Wei Wang 2018-08-27 34 __GFP_NOMEMALLOC) 86a559787e6f5c Wei Wang 2018-08-27 35 /* The order of free page blocks to report to host */ 2a946fa1c8bc26 Michael S. Tsirkin 2019-11-19 36 #define VIRTIO_BALLOON_HINT_BLOCK_ORDER (MAX_ORDER - 1) 86a559787e6f5c Wei Wang 2018-08-27 37 /* The size of a free page block in bytes */ 2a946fa1c8bc26 Michael S. Tsirkin 2019-11-19 38 #define VIRTIO_BALLOON_HINT_BLOCK_BYTES \ 2a946fa1c8bc26 Michael S. Tsirkin 2019-11-19 39 (1 << (VIRTIO_BALLOON_HINT_BLOCK_ORDER + PAGE_SHIFT)) 63b9b80e9f5b2c Michael S. Tsirkin 2019-11-19 @40 #define VIRTIO_BALLOON_HINT_BLOCK_PAGES (1 << VIRTIO_BALLOON_HINT_BLOCK_ORDER) 86a559787e6f5c Wei Wang 2018-08-27 41 :::::: The code at line 40 was first introduced by commit :::::: 63b9b80e9f5b2c463d98d6e550e0d0e3ace66033 virtio_balloon: divide/multiply instead of shifts :::::: TO: Michael S. Tsirkin <mst@xxxxxxxxxx> :::::: CC: Michael S. Tsirkin <mst@xxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
