Re: [PATCH v3 8/8] kallsyms: Add self-test facility

From: kernel test robot <lkp@intel.com>
To: Zhen Lei <thunder.leizhen@huawei.com>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
	Petr Mladek <pmladek@suse.com>,
	Joe Lawrence <joe.lawrence@redhat.com>,
	live-patching@vger.kernel.org, linux-kernel@vger.kernel.org,
	Masahiro Yamada <masahiroy@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	linux-modules@vger.kernel.org
Cc: kbuild-all@lists.01.org,
	Linux Memory Management List <linux-mm@kvack.org>,
	Zhen Lei <thunder.leizhen@huawei.com>
Subject: Re: [PATCH v3 8/8] kallsyms: Add self-test facility
Date: Tue, 20 Sep 2022 11:14:07 +0800	[thread overview]
Message-ID: <202209201126.fpHaqBEx-lkp@intel.com> (raw)
In-Reply-To: <20220919151533.1734-9-thunder.leizhen@huawei.com>

Hi Zhen,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mcgrof/modules-next]
[also build test WARNING on linus/master v6.0-rc6 next-20220919]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhen-Lei/kallsyms-Optimizes-the-performance-of-lookup-symbols/20220919-231916
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git modules-next
config: arm-nhk8815_defconfig (https://download.01.org/0day-ci/archive/20220920/202209201126.fpHaqBEx-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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/26fdb8f3984ffbdb57da2d1fac7e32ae418bfa96
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zhen-Lei/kallsyms-Optimizes-the-performance-of-lookup-symbols/20220919-231916
        git checkout 26fdb8f3984ffbdb57da2d1fac7e32ae418bfa96
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> kernel/kallsyms.c:196:15: warning: no previous prototype for 'kallsyms_sym_address' [-Wmissing-prototypes]
     196 | unsigned long kallsyms_sym_address(int idx)
         |               ^~~~~~~~~~~~~~~~~~~~
   kernel/kallsyms.c:668:12: warning: no previous prototype for 'arch_get_kallsym' [-Wmissing-prototypes]
     668 | int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
         |            ^~~~~~~~~~~~~~~~

vim +/kallsyms_sym_address +196 kernel/kallsyms.c

   195	
 > 196	unsigned long kallsyms_sym_address(int idx)
   197	{
   198		if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
   199			return kallsyms_addresses[idx];
   200	
   201		/* values are unsigned offsets if --absolute-percpu is not in effect */
   202		if (!IS_ENABLED(CONFIG_KALLSYMS_ABSOLUTE_PERCPU))
   203			return kallsyms_relative_base + (u32)kallsyms_offsets[idx];
   204	
   205		/* ...otherwise, positive offsets are absolute values */
   206		if (kallsyms_offsets[idx] >= 0)
   207			return kallsyms_offsets[idx];
   208	
   209		/* ...and negative offsets are relative to kallsyms_relative_base - 1 */
   210		return kallsyms_relative_base - 1 - kallsyms_offsets[idx];
   211	}
   212	

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