netdev - Re: [PATCH net] rhashtable: avoid large lock-array allocations

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Message-ID: <20160812023139.GC5332@breakpoint.cc>
Date:	Fri, 12 Aug 2016 04:31:39 +0200
From:	Florian Westphal <fw@...len.de>
To:	kbuild test robot <lkp@...el.com>
Cc:	Florian Westphal <fw@...len.de>, kbuild-all@...org,
	netdev@...r.kernel.org, tgraf@...g.ch
Subject: Re: [PATCH net] rhashtable: avoid large lock-array allocations

kbuild test robot <lkp@...el.com> wrote:
> 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)

I will send a v2 tomorrow, perhaps its better to just go for
32UL instead of this construct after all.