linux-kernel - Re: [PATCH v2 bpf-next 8/8] bpf: simplify select_bpf_prog_pack

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Date:   Fri, 20 May 2022 09:57:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Song Liu <song@...nel.org>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, linux-mm@...ck.org
Cc:     kbuild-all@...ts.01.org, ast@...nel.org, daniel@...earbox.net,
        mcgrof@...nel.org, torvalds@...ux-foundation.org,
        rick.p.edgecombe@...el.com, kernel-team@...com,
        Song Liu <song@...nel.org>
Subject: Re: [PATCH v2 bpf-next 8/8] bpf: simplify select_bpf_prog_pack_size

Hi Song,

I love your patch! Perhaps something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Song-Liu/bpf_prog_pack-followup/20220520-043417
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20220520/202205200913.DnvvOaAw-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/2d5d4beb45be09f3130b694f49ab1b1fd1aa4470
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Song-Liu/bpf_prog_pack-followup/20220520-043417
        git checkout 2d5d4beb45be09f3130b694f49ab1b1fd1aa4470
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/bpf/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   kernel/bpf/core.c: In function 'select_bpf_prog_pack_size':
>> kernel/bpf/core.c:857:15: warning: unused variable 'ptr' [-Wunused-variable]
     857 |         void *ptr;
         |               ^~~


vim +/ptr +857 kernel/bpf/core.c

e581094167beb6 Song Liu 2022-03-21  853  
ef078600eec20f Song Liu 2022-03-11  854  static size_t select_bpf_prog_pack_size(void)
ef078600eec20f Song Liu 2022-03-11  855  {
ef078600eec20f Song Liu 2022-03-11  856  	size_t size;
ef078600eec20f Song Liu 2022-03-11 @857  	void *ptr;
ef078600eec20f Song Liu 2022-03-11  858  
2d5d4beb45be09 Song Liu 2022-05-19  859  	if (huge_vmalloc_supported()) {
e581094167beb6 Song Liu 2022-03-21  860  		size = BPF_HPAGE_SIZE * num_online_nodes();
2d5d4beb45be09 Song Liu 2022-05-19  861  		bpf_prog_pack_mask = BPF_HPAGE_MASK;
2d5d4beb45be09 Song Liu 2022-05-19  862  	} else {
ef078600eec20f Song Liu 2022-03-11  863  		size = PAGE_SIZE;
96805674e5624b Song Liu 2022-03-21  864  		bpf_prog_pack_mask = PAGE_MASK;
96805674e5624b Song Liu 2022-03-21  865  	}
ef078600eec20f Song Liu 2022-03-11  866  
ef078600eec20f Song Liu 2022-03-11  867  	return size;
ef078600eec20f Song Liu 2022-03-11  868  }
ef078600eec20f Song Liu 2022-03-11  869  

-- 
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https://01.org/lkp