Re: [PATCH v3] arm64: mte: move register initialization to C

[kernel test robot <lkp@intel.com>]

Hi Evgenii,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on linus/master v6.0-rc3 next-20220901]
[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/Evgenii-Stepanov/arm64-mte-move-register-initialization-to-C/20220902-052059
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm64-randconfig-c033-20220904 (https://download.01.org/0day-ci/archive/20220904/202209042051.7ivKujfl-lkp@intel.com/config)
compiler: aarch64-linux-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/23927b7e78758b39d3463ae0a79b6b1af8fdef8b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Evgenii-Stepanov/arm64-mte-move-register-initialization-to-C/20220902-052059
        git checkout 23927b7e78758b39d3463ae0a79b6b1af8fdef8b
        # 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=arm64 SHELL=/bin/bash arch/arm64/kernel/

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

All errors (new ones prefixed by >>):

   arch/arm64/kernel/suspend.c:34:13: warning: no previous prototype for 'cpu_suspend_set_dbg_restorer' [-Wmissing-prototypes]
      34 | void __init cpu_suspend_set_dbg_restorer(int (*hw_bp_restore)(unsigned int))
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/suspend.c: In function '__cpu_suspend_exit':
>> arch/arm64/kernel/suspend.c:46:9: error: implicit declaration of function 'mte_suspend_exit'; did you mean 'mte_suspend_enter'? [-Werror=implicit-function-declaration]
      46 |         mte_suspend_exit();
         |         ^~~~~~~~~~~~~~~~
         |         mte_suspend_enter
   cc1: some warnings being treated as errors


vim +46 arch/arm64/kernel/suspend.c

    41	
    42	void notrace __cpu_suspend_exit(void)
    43	{
    44		unsigned int cpu = smp_processor_id();
    45	
  > 46		mte_suspend_exit();
    47	
    48		/*
    49		 * We are resuming from reset with the idmap active in TTBR0_EL1.
    50		 * We must uninstall the idmap and restore the expected MMU
    51		 * state before we can possibly return to userspace.
    52		 */
    53		cpu_uninstall_idmap();
    54	
    55		/* Restore CnP bit in TTBR1_EL1 */
    56		if (system_supports_cnp())
    57			cpu_replace_ttbr1(lm_alias(swapper_pg_dir), idmap_pg_dir);
    58	
    59		/*
    60		 * PSTATE was not saved over suspend/resume, re-enable any detected
    61		 * features that might not have been set correctly.
    62		 */
    63		__uaccess_enable_hw_pan();
    64	
    65		/*
    66		 * Restore HW breakpoint registers to sane values
    67		 * before debug exceptions are possibly reenabled
    68		 * by cpu_suspend()s local_daif_restore() call.
    69		 */
    70		if (hw_breakpoint_restore)
    71			hw_breakpoint_restore(cpu);
    72	
    73		/*
    74		 * On resume, firmware implementing dynamic mitigation will
    75		 * have turned the mitigation on. If the user has forcefully
    76		 * disabled it, make sure their wishes are obeyed.
    77		 */
    78		spectre_v4_enable_mitigation(NULL);
    79	
    80		/* Restore additional feature-specific configuration */
    81		ptrauth_suspend_exit();
    82	}
    83	

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