netdev - Re: [PATCH bpf-next 08/14] bpf: introduce the bpf_get_local

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Message-ID: <201806290330.EIToJJaV%fengguang.wu@intel.com>
Date:   Fri, 29 Jun 2018 04:02:08 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Roman Gushchin <guro@...com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com, tj@...nel.org,
        Roman Gushchin <guro@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next 08/14] bpf: introduce the
 bpf_get_local_storage() helper function

Hi Roman,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Roman-Gushchin/bpf-cgroup-local-storage/20180629-031527
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-x017-201825 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   kernel/bpf/helpers.c: In function '____bpf_get_local_storage':
>> kernel/bpf/helpers.c:206:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     return (u64)this_cpu_read(bpf_cgroup_storage);
            ^

vim +206 kernel/bpf/helpers.c

   198	
   199	BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
   200	{
   201		/* map and flags arguments are not used now,
   202		 * but provide an ability to extend the API
   203		 * for other types of local storages.
   204		 * verifier checks that their values are correct.
   205		 */
 > 206		return (u64)this_cpu_read(bpf_cgroup_storage);
   207	}
   208	

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

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