Re: [PATCH] rcu: Display registers of self-detected stall as far as possible

[kernel test robot]

Hi Zhen,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on paulmck-rcu/dev]
[also build test ERROR on linus/master v5.19-rc8 next-20220727]
[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/rcu-Display-registers-of-self-detected-stall-as-far-as-possible/20220727-141107
base:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
config: x86_64-randconfig-a005 (https://download.01.org/0day-ci/archive/20220728/202207280520.yvgjXjJx-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 8dfaecc4c24494337933aff9d9166486ca0949f1)
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/9f3fe5a0e46546db5bcfd1f33f12d87339e5de98
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zhen-Lei/rcu-Display-registers-of-self-detected-stall-as-far-as-possible/20220727-141107
        git checkout 9f3fe5a0e46546db5bcfd1f33f12d87339e5de98
        # 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=x86_64 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   In file included from kernel/rcu/tree.c:4641:
>> kernel/rcu/tree_stall.h:358:10: error: call to undeclared function 'get_irq_regs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   regs = get_irq_regs();
                          ^
>> kernel/rcu/tree_stall.h:358:8: error: incompatible integer to pointer conversion assigning to 'struct pt_regs *' from 'int' [-Wint-conversion]
                   regs = get_irq_regs();
                        ^ ~~~~~~~~~~~~~~
   2 errors generated.


vim +/get_irq_regs +358 kernel/rcu/tree_stall.h

   352	
   353	static void rcu_dump_cpu_task(int cpu)
   354	{
   355		if (cpu == smp_processor_id() && in_irq()) {
   356			struct pt_regs *regs;
   357	
 > 358			regs = get_irq_regs();
   359			if (regs) {
   360				show_regs(regs);
   361				return;
   362			}
   363		}
   364	
   365		dump_cpu_task(cpu);
   366	}
   367	

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