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':quoted
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); \
^quoted
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,
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