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

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Date:   Fri, 20 May 2022 10:53:09 +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:     llvm@...ts.linux.dev, 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: x86_64-randconfig-a005 (https://download.01.org/0day-ci/archive/20220520/202205201001.kKBulowq-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e00cbbec06c08dc616a0d52a20f678b8fbd4e304)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # 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
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 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:857:8: warning: unused variable 'ptr' [-Wunused-variable]
           void *ptr;
                 ^
   kernel/bpf/core.c:1656:12: warning: no previous prototype for function 'bpf_probe_read_kernel' [-Wmissing-prototypes]
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
              ^
   kernel/bpf/core.c:1656:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr)
   ^
   static 
   kernel/bpf/core.c:2099:6: warning: no previous prototype for function 'bpf_patch_call_args' [-Wmissing-prototypes]
   void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
        ^
   kernel/bpf/core.c:2099:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth)
   ^
   static 
   3 warnings generated.


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  

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp