linux-kernel - Re: [PATCH] net, bpf: use kvzalloc helper

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Message-ID: <201701262252.gmuy046E%fengguang.wu@intel.com>
Date:   Thu, 26 Jan 2017 22:58:28 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     kbuild-all@...org, Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        marcelo.leitner@...il.com
Subject: Re: [PATCH] net, bpf: use kvzalloc helper

Hi Michal,

[auto build test ERROR on next-20170125]
[cannot apply to linus/master linux/master nf-next/master v4.9-rc8 v4.9-rc7 v4.9-rc6 v4.10-rc5]
[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/Michal-Hocko/net-bpf-use-kvzalloc-helper/20170126-221904
config: x86_64-randconfig-x014-201704 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   kernel/bpf/syscall.c: In function 'bpf_map_area_alloc':
>> kernel/bpf/syscall.c:61:9: error: implicit declaration of function 'kvzalloc' [-Werror=implicit-function-declaration]
     return kvzalloc(size, GFP_USER);
            ^~~~~~~~
>> kernel/bpf/syscall.c:61:9: warning: return makes pointer from integer without a cast [-Wint-conversion]
     return kvzalloc(size, GFP_USER);
            ^~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/kvzalloc +61 kernel/bpf/syscall.c

    55	{
    56		/*
    57		 * FIXME: we would really like to not trigger the OOM killer and rather
    58		 * fail instead. This is not supported right now. Please nag MM people
    59		 * if these OOM start bothering people.
    60		 */
  > 61		return kvzalloc(size, GFP_USER);
    62	}
    63	
    64	void bpf_map_area_free(void *area)

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

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