Re: [RFC PATCH 4/5] sched/core: Push current task when cpu is parked

[Shrikanth Hegde <sshegde@linux.ibm.com>]

On 5/24/25 13:09, kernel test robot wrote:
> Hi Shrikanth,
> 
> [This is a private test report for your RFC patch.]
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on tip/sched/core]
> [also build test ERROR on powerpc/next powerpc/fixes peterz-queue/sched/core linus/master tip/smp/core v6.15-rc7 next-20250523]
> [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/Shrikanth-Hegde/cpumask-Introduce-cpu-parked-mask/20250524-021851
> base:   tip/sched/core
> patch link:    https://lore.kernel.org/r/20250523181448.3777233-5-sshegde%40linux.ibm.com
> patch subject: [RFC PATCH 4/5] sched/core: Push current task when cpu is parked
> config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20250524/202505241517.5L95fW8h-lkp@intel.com/config)
> compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250524/202505241517.5L95fW8h-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202505241517.5L95fW8h-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 

Thanks for the report. This is due to NR_CPUS=1. will get this fixed in v2.

>>> kernel/sched/core.c:5660:6: error: call to undeclared function 'cpu_parked'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>      5660 |         if (cpu_parked(cpu))
>           |             ^
>     kernel/sched/core.c:7667:12: warning: array index -1 is before the beginning of the array [-Warray-bounds]
>      7667 |                                        preempt_modes[preempt_dynamic_mode] : "undef",
>           |                                        ^             ~~~~~~~~~~~~~~~~~~~~
>     kernel/sched/core.c:7642:1: note: array 'preempt_modes' declared here
>      7642 | const char *preempt_modes[] = {
>           | ^
>     1 warning and 1 error generated.
> 
>