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SubjectRe: [PATCH v5] net: sched: convert qdisc linked list to hashtable
Hi,

[auto build test WARNING on v4.7-rc7]
[cannot apply to net/master net-next/master ipsec-next/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Jiri-Kosina/net-sched-convert-qdisc-linked-list-to-hashtable/20160729-155412
config: x86_64-randconfig-s1-07292101 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All warnings (new ones prefixed by >>):

In file included from drivers/net/ethernet/dec/tulip/de4x5.c:480:
drivers/net/ethernet/dec/tulip/de4x5.h:864:1: warning: "HASH_BITS" redefined
In file included from include/linux/netdevice.h:55,
from drivers/net/ethernet/dec/tulip/de4x5.c:459:
>> include/linux/hashtable.h:27:1: warning: this is the location of the previous definition
drivers/net/ethernet/dec/tulip/de4x5.o: warning: objtool: dma_free_coherent()+0x4b: function has unreachable instruction

vim +27 include/linux/hashtable.h

d9b482c8 Sasha Levin 2012-10-30 11 #include <linux/kernel.h>
d9b482c8 Sasha Levin 2012-10-30 12 #include <linux/hash.h>
d9b482c8 Sasha Levin 2012-10-30 13 #include <linux/rculist.h>
d9b482c8 Sasha Levin 2012-10-30 14
d9b482c8 Sasha Levin 2012-10-30 15 #define DEFINE_HASHTABLE(name, bits) \
d9b482c8 Sasha Levin 2012-10-30 16 struct hlist_head name[1 << (bits)] = \
d9b482c8 Sasha Levin 2012-10-30 17 { [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
d9b482c8 Sasha Levin 2012-10-30 18
6180d9de Eric Dumazet 2015-11-18 19 #define DEFINE_READ_MOSTLY_HASHTABLE(name, bits) \
6180d9de Eric Dumazet 2015-11-18 20 struct hlist_head name[1 << (bits)] __read_mostly = \
6180d9de Eric Dumazet 2015-11-18 21 { [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
6180d9de Eric Dumazet 2015-11-18 22
d9b482c8 Sasha Levin 2012-10-30 23 #define DECLARE_HASHTABLE(name, bits) \
d9b482c8 Sasha Levin 2012-10-30 24 struct hlist_head name[1 << (bits)]
d9b482c8 Sasha Levin 2012-10-30 25
d9b482c8 Sasha Levin 2012-10-30 26 #define HASH_SIZE(name) (ARRAY_SIZE(name))
d9b482c8 Sasha Levin 2012-10-30 @27 #define HASH_BITS(name) ilog2(HASH_SIZE(name))
d9b482c8 Sasha Levin 2012-10-30 28
d9b482c8 Sasha Levin 2012-10-30 29 /* Use hash_32 when possible to allow for fast 32bit hashing in 64bit kernels. */
d9b482c8 Sasha Levin 2012-10-30 30 #define hash_min(val, bits) \
d9b482c8 Sasha Levin 2012-10-30 31 (sizeof(val) <= 4 ? hash_32(val, bits) : hash_long(val, bits))
d9b482c8 Sasha Levin 2012-10-30 32
d9b482c8 Sasha Levin 2012-10-30 33 static inline void __hash_init(struct hlist_head *ht, unsigned int sz)
d9b482c8 Sasha Levin 2012-10-30 34 {
d9b482c8 Sasha Levin 2012-10-30 35 unsigned int i;

:::::: The code at line 27 was first introduced by commit
:::::: d9b482c8ba1973a189f2d4c8175d405b87fbf2d7 hashtable: introduce a small and naive hashtable

:::::: TO: Sasha Levin <levinsasha928@gmail.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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