Re: [PATCH v2 3/4] arm64: implement stack_trace_save_shadow

[kernel test robot]

Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20220323]
[cannot apply to arm64/for-next/core hnaz-mm/master linus/master v5.17 v5.17-rc8 v5.17-rc7 v5.17]
[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]

url:    https://github.com/0day-ci/linux/commits/andrey-konovalov-linux-dev/kasan-arm64-scs-stacktrace-collect-stack-traces-from-Shadow-Call-Stack/20220323-233436
base:    b61581ae229d8eb9f21f8753be3f4011f7692384
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20220324/202203241622.fKuBI2l5-lkp@xxxxxxxxx/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
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/0day-ci/linux/commit/322e934f3c0bb04b4afb32207ba142153f1dd84e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review andrey-konovalov-linux-dev/kasan-arm64-scs-stacktrace-collect-stack-traces-from-Shadow-Call-Stack/20220323-233436
        git checkout 322e934f3c0bb04b4afb32207ba142153f1dd84e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/

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

All warnings (new ones prefixed by >>):

   arch/arm64/kernel/stacktrace.c: In function 'arch_stack_walk_shadow':
   arch/arm64/kernel/stacktrace.c:289:20: error: implicit declaration of function 'task_scs'; did you mean 'task_lock'? [-Werror=implicit-function-declaration]
     289 |         scs_base = task_scs(current);
         |                    ^~~~~~~~
         |                    task_lock
>> arch/arm64/kernel/stacktrace.c:289:18: warning: assignment to 'long unsigned int *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     289 |         scs_base = task_scs(current);
         |                  ^
   cc1: some warnings being treated as errors


vim +289 arch/arm64/kernel/stacktrace.c

   260	
   261	noinline notrace int arch_stack_walk_shadow(unsigned long *store,
   262						    unsigned int size,
   263						    unsigned int skipnr)
   264	{
   265		unsigned long *scs_top, *scs_base, *scs_next;
   266		unsigned int len = 0, part;
   267	
   268		preempt_disable();
   269	
   270		/* Get the SCS pointer. */
   271		asm volatile("mov %0, x18" : "=&r" (scs_top));
   272	
   273		/* The top SCS slot is empty. */
   274		scs_top -= 1;
   275	
   276		/* Handle SDEI and hardirq frames. */
   277		for (part = 0; part < ARRAY_SIZE(scs_parts); part++) {
   278			scs_next = *this_cpu_ptr(scs_parts[part].saved);
   279			if (scs_next) {
   280				scs_base = *this_cpu_ptr(scs_parts[part].base);
   281				if (walk_shadow_stack_part(scs_top, scs_base, store,
   282							   size, &skipnr, &len))
   283					goto out;
   284				scs_top = scs_next;
   285			}
   286		}
   287	
   288		/* Handle task and softirq frames. */
 > 289		scs_base = task_scs(current);

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