[kas:kvm-unmapped-memfd-secret 259/305] lib/stackdepot.c:154:2: warning: ignoring return value of 'kstrtobool', declared with attribute warn_unused_result

[kas:kvm-unmapped-memfd-secret 259/305] lib/stackdepot.c:154:2: warning: ignoring return value of 'kstrtobool', declared with attribute warn_unused_result

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git kvm-unmapped-memfd-secret
head:   94275e094f4072635764a33ae668a1c42e588034
commit: c35686e535d7b1e77d1597ea230e6d0c42db19b8 [259/305] lib: stackdepot: add support to disable stack depot
config: ia64-randconfig-r003-20210301 (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git/commit/?id=c35686e535d7b1e77d1597ea230e6d0c42db19b8
        git remote add kas https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git
        git fetch --no-tags kas kvm-unmapped-memfd-secret
        git checkout c35686e535d7b1e77d1597ea230e6d0c42db19b8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

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

All warnings (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:154,
                    from include/linux/pgtable.h:6,
                    from arch/ia64/include/asm/uaccess.h:40,
                    from include/linux/uaccess.h:11,
                    from arch/ia64/include/asm/sections.h:11,
                    from include/linux/interrupt.h:20,
                    from lib/stackdepot.c:23:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
   arch/ia64/include/asm/mmu_context.h:127:41: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
     127 |  unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                         ^~~~~~~
   lib/stackdepot.c: In function 'is_stack_depot_disabled':
>> lib/stackdepot.c:154:2: warning: ignoring return value of 'kstrtobool', declared with attribute warn_unused_result [-Wunused-result]
     154 |  kstrtobool(str, &stack_depot_disable);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/kstrtobool +154 lib/stackdepot.c

   151	
   152	static int __init is_stack_depot_disabled(char *str)
   153	{
 > 154		kstrtobool(str, &stack_depot_disable);
   155		if (stack_depot_disable) {
   156			pr_info("Stack Depot is disabled\n");
   157			stack_table = NULL;
   158		}
   159		return 0;
   160	}
   161	early_param("stack_depot_disable", is_stack_depot_disabled);
   162	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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