Re: [PATCH] sched: Fix tg->load when offlining a CPU

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

Hi Vincent,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on peterz-queue/sched/core linus/master v6.7-rc6 next-20231222]
[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/Vincent-Guittot/sched-Fix-tg-load-when-offlining-a-CPU/20231222-172438
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20231221164014.447122-1-vincent.guittot%40linaro.org
patch subject: [PATCH] sched: Fix tg->load when offlining a CPU
config: hexagon-defconfig (https://download.01.org/0day-ci/archive/20231223/202312230731.vxFaJB7G-lkp@intel.com/config)
compiler: clang version 18.0.0git (https://github.com/llvm/llvm-project d3ef86708241a3bee902615c190dead1638c4e09)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231223/202312230731.vxFaJB7G-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/202312230731.vxFaJB7G-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/sched/fair.c:28:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     547 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     560 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from kernel/sched/fair.c:28:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     573 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from kernel/sched/fair.c:28:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:337:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     584 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     594 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     604 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> kernel/sched/fair.c:12498:2: error: call to undeclared function 'clear_tg_offline_cfs_rqs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    12498 |         clear_tg_offline_cfs_rqs(rq);
          |         ^
   kernel/sched/fair.c:12498:2: note: did you mean 'unthrottle_offline_cfs_rqs'?
   kernel/sched/fair.c:6620:20: note: 'unthrottle_offline_cfs_rqs' declared here
    6620 | static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {}
         |                    ^
   kernel/sched/fair.c:13124:6: warning: no previous prototype for function 'free_fair_sched_group' [-Wmissing-prototypes]
    13124 | void free_fair_sched_group(struct task_group *tg) { }
          |      ^
   kernel/sched/fair.c:13124:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    13124 | void free_fair_sched_group(struct task_group *tg) { }
          | ^
          | static 
   kernel/sched/fair.c:13126:5: warning: no previous prototype for function 'alloc_fair_sched_group' [-Wmissing-prototypes]
    13126 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
          |     ^
   kernel/sched/fair.c:13126:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    13126 | int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
          | ^
          | static 
   kernel/sched/fair.c:13131:6: warning: no previous prototype for function 'online_fair_sched_group' [-Wmissing-prototypes]
    13131 | void online_fair_sched_group(struct task_group *tg) { }
          |      ^
   kernel/sched/fair.c:13131:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    13131 | void online_fair_sched_group(struct task_group *tg) { }
          | ^
          | static 
   kernel/sched/fair.c:13133:6: warning: no previous prototype for function 'unregister_fair_sched_group' [-Wmissing-prototypes]
    13133 | void unregister_fair_sched_group(struct task_group *tg) { }
          |      ^
   kernel/sched/fair.c:13133:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    13133 | void unregister_fair_sched_group(struct task_group *tg) { }
          | ^
          | static 
   10 warnings and 1 error generated.


vim +/clear_tg_offline_cfs_rqs +12498 kernel/sched/fair.c

 12489	
 12490	static void rq_offline_fair(struct rq *rq)
 12491	{
 12492		update_sysctl();
 12493	
 12494		/* Ensure any throttled groups are reachable by pick_next_task */
 12495		unthrottle_offline_cfs_rqs(rq);
 12496	
 12497		/* Ensure that we remove rq contribution to group share */
 12498		clear_tg_offline_cfs_rqs(rq);
 12499	}
 12500	

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