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

From: kernel test robot
Date: Mon Sep 19 2022 - 23:15:58 EST


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: i386-randconfig-a001-20220919 (https://download.01.org/0day-ci/archive/20220920/202209201123.hihIfjo1-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> kernel/kallsyms.c:196:15: warning: no previous prototype for function 'kallsyms_sym_address' [-Wmissing-prototypes]
unsigned long kallsyms_sym_address(int idx)
^
kernel/kallsyms.c:196:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
unsigned long kallsyms_sym_address(int idx)
^
static
kernel/kallsyms.c:668:12: warning: no previous prototype for function 'arch_get_kallsym' [-Wmissing-prototypes]
int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
^
kernel/kallsyms.c:668:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
^
static
2 warnings generated.


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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