Re: [PATCH v2 2/4] arm64, scs: save scs_sp values per-cpu when switching stacks

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

Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20220323]
[also build test ERROR on v5.17]
[cannot apply to arm64/for-next/core hnaz-mm/master linus/master v5.17 v5.17-rc8 v5.17-rc7]
[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/20220324/202203241922.UDw4JHPD-lkp@intel.com/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/da5bedb1ac7aa0b303f6d996d306e675860b6e12
        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 da5bedb1ac7aa0b303f6d996d306e675860b6e12
        # 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

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

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/percpu.h:7,
                    from arch/arm64/include/asm/percpu.h:248,
                    from include/linux/irqflags.h:17,
                    from include/linux/spinlock.h:58,
                    from include/linux/irq.h:14,
                    from arch/arm64/kernel/irq.c:13:
   arch/arm64/kernel/irq.c: In function 'init_irq_scs':
>> arch/arm64/kernel/irq.c:44:25: error: 'irq_shadow_call_stack_ptr' undeclared (first use in this function)
      44 |                 per_cpu(irq_shadow_call_stack_ptr, cpu) =
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:219:54: note: in definition of macro '__verify_pcpu_ptr'
     219 |         const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;    \
         |                                                      ^~~
   include/linux/percpu-defs.h:269:35: note: in expansion of macro 'per_cpu_ptr'
     269 | #define per_cpu(var, cpu)       (*per_cpu_ptr(&(var), cpu))
         |                                   ^~~~~~~~~~~
   arch/arm64/kernel/irq.c:44:17: note: in expansion of macro 'per_cpu'
      44 |                 per_cpu(irq_shadow_call_stack_ptr, cpu) =
         |                 ^~~~~~~
   arch/arm64/kernel/irq.c:44:25: note: each undeclared identifier is reported only once for each function it appears in
      44 |                 per_cpu(irq_shadow_call_stack_ptr, cpu) =
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:219:54: note: in definition of macro '__verify_pcpu_ptr'
     219 |         const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;    \
         |                                                      ^~~
   include/linux/percpu-defs.h:269:35: note: in expansion of macro 'per_cpu_ptr'
     269 | #define per_cpu(var, cpu)       (*per_cpu_ptr(&(var), cpu))
         |                                   ^~~~~~~~~~~
   arch/arm64/kernel/irq.c:44:17: note: in expansion of macro 'per_cpu'
      44 |                 per_cpu(irq_shadow_call_stack_ptr, cpu) =
         |                 ^~~~~~~
   arch/arm64/kernel/irq.c: At top level:
   arch/arm64/kernel/irq.c:105:13: warning: no previous prototype for 'init_IRQ' [-Wmissing-prototypes]
     105 | void __init init_IRQ(void)
         |             ^~~~~~~~


vim +/irq_shadow_call_stack_ptr +44 arch/arm64/kernel/irq.c

ac20ffbb0279aa Sami Tolvanen 2020-11-30  35  
ac20ffbb0279aa Sami Tolvanen 2020-11-30  36  static void init_irq_scs(void)
ac20ffbb0279aa Sami Tolvanen 2020-11-30  37  {
ac20ffbb0279aa Sami Tolvanen 2020-11-30  38  	int cpu;
ac20ffbb0279aa Sami Tolvanen 2020-11-30  39  
ac20ffbb0279aa Sami Tolvanen 2020-11-30  40  	if (!IS_ENABLED(CONFIG_SHADOW_CALL_STACK))
ac20ffbb0279aa Sami Tolvanen 2020-11-30  41  		return;
ac20ffbb0279aa Sami Tolvanen 2020-11-30  42  
ac20ffbb0279aa Sami Tolvanen 2020-11-30  43  	for_each_possible_cpu(cpu)
ac20ffbb0279aa Sami Tolvanen 2020-11-30 @44  		per_cpu(irq_shadow_call_stack_ptr, cpu) =
ac20ffbb0279aa Sami Tolvanen 2020-11-30  45  			scs_alloc(cpu_to_node(cpu));
ac20ffbb0279aa Sami Tolvanen 2020-11-30  46  }
ac20ffbb0279aa Sami Tolvanen 2020-11-30  47  

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