linux-kernel - Re: [PATCH v5] net: sched: convert qdisc linked list to hashtable

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Date:	Sat, 30 Jul 2016 04:01:43 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	kbuild-all@...org, Eric Dumazet <eric.dumazet@...il.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Phil Sutter <phil@....cc>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [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@...il.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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