Hi Nicholas, I love your patch! Yet something to improve: [auto build test ERROR on linux/master] [also build test ERROR on tip/sched/core linus/master v5.12-rc3 next-20210317] [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/Nicholas-Piggin/Increase-page-and-bit-waitqueue-hash-size/20210317-155619 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a74e6a014c9d4d4161061f770c9b4f98372ac778 config: nds32-randconfig-r016-20210317 (attached as .config) compiler: nds32le-linux-gcc (GCC) 9.3.0 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://github.com/0day-ci/linux/commit/d741b0903849631440ae34fb070178e9743c6928 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Nicholas-Piggin/Increase-page-and-bit-waitqueue-hash-size/20210317-155619 git checkout d741b0903849631440ae34fb070178e9743c6928 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All error/warnings (new ones prefixed by >>): >> mm/filemap.c:997:26: error: variably modified 'page_wait_table' at file scope 997 | static wait_queue_head_t page_wait_table[PAGE_WAIT_TABLE_SIZE] __cacheline_aligned; | ^~~~~~~~~~~~~~~ mm/filemap.c: In function 'pagecache_init': >> mm/filemap.c:1018:8: warning: passing argument 6 of 'alloc_large_system_hash' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] 1018 | &page_wait_table_bits, | ^~~~~~~~~~~~~~~~~~~~~ In file included from mm/filemap.c:37: include/linux/memblock.h:574:14: note: expected 'unsigned int *' but argument is of type 'const unsigned int *' 574 | extern void *alloc_large_system_hash(const char *tablename, | ^~~~~~~~~~~~~~~~~~~~~~~ >> mm/filemap.c:1013:19: error: assignment to expression with array type 1013 | page_wait_table = alloc_large_system_hash("page waitqueue hash", | ^ -- >> kernel/sched/wait_bit.c:11:26: error: variably modified 'bit_wait_table' at file scope 11 | static wait_queue_head_t bit_wait_table[BIT_WAIT_TABLE_SIZE] __cacheline_aligned; | ^~~~~~~~~~~~~~ kernel/sched/wait_bit.c: In function 'wait_bit_init': >> kernel/sched/wait_bit.c:260:8: warning: passing argument 6 of 'alloc_large_system_hash' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] 260 | &bit_wait_table_bits, | ^~~~~~~~~~~~~~~~~~~~ In file included from kernel/sched/wait_bit.c:5: include/linux/memblock.h:574:14: note: expected 'unsigned int *' but argument is of type 'const unsigned int *' 574 | extern void *alloc_large_system_hash(const char *tablename, | ^~~~~~~~~~~~~~~~~~~~~~~ >> kernel/sched/wait_bit.c:255:18: error: assignment to expression with array type 255 | bit_wait_table = alloc_large_system_hash("bit waitqueue hash", | ^ vim +/page_wait_table +997 mm/filemap.c 44110fe385af23 Paul Jackson 2006-03-24 983 ^1da177e4c3f41 Linus Torvalds 2005-04-16 984 /* ^1da177e4c3f41 Linus Torvalds 2005-04-16 985 * In order to wait for pages to become available there must be ^1da177e4c3f41 Linus Torvalds 2005-04-16 986 * waitqueues associated with pages. By using a hash table of ^1da177e4c3f41 Linus Torvalds 2005-04-16 987 * waitqueues where the bucket discipline is to maintain all ^1da177e4c3f41 Linus Torvalds 2005-04-16 988 * waiters on the same queue and wake all when any of the pages ^1da177e4c3f41 Linus Torvalds 2005-04-16 989 * become available, and for the woken contexts to check to be ^1da177e4c3f41 Linus Torvalds 2005-04-16 990 * sure the appropriate page became available, this saves space ^1da177e4c3f41 Linus Torvalds 2005-04-16 991 * at a cost of "thundering herd" phenomena during rare hash ^1da177e4c3f41 Linus Torvalds 2005-04-16 992 * collisions. ^1da177e4c3f41 Linus Torvalds 2005-04-16 993 */ d741b090384963 Nicholas Piggin 2021-03-17 994 #define PAGE_WAIT_TABLE_SIZE (1 << page_wait_table_bits) d741b090384963 Nicholas Piggin 2021-03-17 995 #if CONFIG_BASE_SMALL d741b090384963 Nicholas Piggin 2021-03-17 996 static const unsigned int page_wait_table_bits = 4; 62906027091f1d Nicholas Piggin 2016-12-25 @997 static wait_queue_head_t page_wait_table[PAGE_WAIT_TABLE_SIZE] __cacheline_aligned; d741b090384963 Nicholas Piggin 2021-03-17 998 #else d741b090384963 Nicholas Piggin 2021-03-17 999 static unsigned int page_wait_table_bits __ro_after_init; d741b090384963 Nicholas Piggin 2021-03-17 1000 static wait_queue_head_t *page_wait_table __ro_after_init; d741b090384963 Nicholas Piggin 2021-03-17 1001 #endif 62906027091f1d Nicholas Piggin 2016-12-25 1002 62906027091f1d Nicholas Piggin 2016-12-25 1003 static wait_queue_head_t *page_waitqueue(struct page *page) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1004 { d741b090384963 Nicholas Piggin 2021-03-17 1005 return &page_wait_table[hash_ptr(page, page_wait_table_bits)]; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1006 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1007 62906027091f1d Nicholas Piggin 2016-12-25 1008 void __init pagecache_init(void) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1009 { 62906027091f1d Nicholas Piggin 2016-12-25 1010 int i; 62906027091f1d Nicholas Piggin 2016-12-25 1011 d741b090384963 Nicholas Piggin 2021-03-17 1012 if (!CONFIG_BASE_SMALL) { d741b090384963 Nicholas Piggin 2021-03-17 @1013 page_wait_table = alloc_large_system_hash("page waitqueue hash", d741b090384963 Nicholas Piggin 2021-03-17 1014 sizeof(wait_queue_head_t), d741b090384963 Nicholas Piggin 2021-03-17 1015 0, d741b090384963 Nicholas Piggin 2021-03-17 1016 21, d741b090384963 Nicholas Piggin 2021-03-17 1017 0, d741b090384963 Nicholas Piggin 2021-03-17 @1018 &page_wait_table_bits, d741b090384963 Nicholas Piggin 2021-03-17 1019 NULL, d741b090384963 Nicholas Piggin 2021-03-17 1020 0, d741b090384963 Nicholas Piggin 2021-03-17 1021 0); d741b090384963 Nicholas Piggin 2021-03-17 1022 } d741b090384963 Nicholas Piggin 2021-03-17 1023 62906027091f1d Nicholas Piggin 2016-12-25 1024 for (i = 0; i < PAGE_WAIT_TABLE_SIZE; i++) 62906027091f1d Nicholas Piggin 2016-12-25 1025 init_waitqueue_head(&page_wait_table[i]); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1026 62906027091f1d Nicholas Piggin 2016-12-25 1027 page_writeback_init(); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1028 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1029 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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