Hi Florian, [auto build test WARNING on net/master]
url: https://github.com/0day-ci/linux/commits/Florian-Westphal/rhashtable-avoid-large-lock-array-allocations/20160812-101458 config: x86_64-randconfig-x015-201632 (attached as .config) compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): In file included from lib/rhashtable.c:18:0: lib/rhashtable.c: In function 'rhashtable_init': >> lib/rhashtable.c:34:30: warning: division by zero [-Wdiv-by-zero] 2 * L1_CACHE_BYTES / sizeof(spinlock_t), 1) ^ include/linux/kernel.h:787:17: note: in definition of macro 'max_t' type __max1 = (x); \ ^ >> lib/rhashtable.c:779:21: note: in expansion of macro 'BUCKET_LOCKS_PER_CPU' ht->p.locks_mul = BUCKET_LOCKS_PER_CPU; ^~~~~~~~~~~~~~~~~~~~ vim +34 lib/rhashtable.c 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17 #include <linux/atomic.h> > 18 #include <linux/kernel.h> 19 #include <linux/init.h> 20 #include <linux/log2.h> 21 #include <linux/sched.h> 22 #include <linux/slab.h> 23 #include <linux/vmalloc.h> 24 #include <linux/mm.h> 25 #include <linux/jhash.h> 26 #include <linux/random.h> 27 #include <linux/rhashtable.h> 28 #include <linux/err.h> 29 #include <linux/export.h> 30 31 #define HASH_DEFAULT_SIZE 64UL 32 #define HASH_MIN_SIZE 4U 33 #define BUCKET_LOCKS_PER_CPU max_t(unsigned int, \ > 34 2 * L1_CACHE_BYTES / sizeof(spinlock_t), 1) 35 36 static u32 head_hashfn(struct rhashtable *ht, 37 const struct bucket_table *tbl, --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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