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* [qais-yousef:sched-setscheduler-hide 2/9] kernel/rcu/rcutorture.c:3174:9: error: call to undeclared function 'rcu_get_gp_kthreads_prio'; ISO C99 and later do not support implicit function declarations
@ 2023-08-26 10:07 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-08-26 10:07 UTC (permalink / raw)
  To: Qais Yousef; +Cc: llvm, oe-kbuild-all

tree:   https://github.com/qais-yousef/linux sched-setscheduler-hide
head:   e586c67baa1c537a793f135e324cc56df2b6585b
commit: 029b407f286d7bc9a7ace79c65483efa8ead8671 [2/9] rcu: Use a new sched_set_rcu_fifo() to set gp kthread prio
config: hexagon-randconfig-r025-20230826 (https://download.01.org/0day-ci/archive/20230826/202308261851.tRxdvzGA-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230826/202308261851.tRxdvzGA-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/202308261851.tRxdvzGA-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from kernel/rcu/rcutorture.c:24:
   In file included from include/linux/interrupt.h:11:
   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:334:
   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/rcu/rcutorture.c:24:
   In file included from include/linux/interrupt.h:11:
   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:334:
   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/rcu/rcutorture.c:24:
   In file included from include/linux/interrupt.h:11:
   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:334:
   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/rcu/rcutorture.c:412:16: warning: variable 'started' set but not used [-Wunused-but-set-variable]
     412 |         unsigned long started;
         |                       ^
   kernel/rcu/rcutorture.c:413:16: warning: variable 'completed' set but not used [-Wunused-but-set-variable]
     413 |         unsigned long completed;
         |                       ^
   kernel/rcu/rcutorture.c:416:21: warning: variable 'ts' set but not used [-Wunused-but-set-variable]
     416 |         unsigned long long ts;
         |                            ^
   kernel/rcu/rcutorture.c:1967:21: warning: variable 'ts' set but not used [-Wunused-but-set-variable]
    1967 |         unsigned long long ts;
         |                            ^
>> kernel/rcu/rcutorture.c:3174:9: error: call to undeclared function 'rcu_get_gp_kthreads_prio'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    3174 |         prio = rcu_get_gp_kthreads_prio();
         |                ^
   10 warnings and 1 error generated.


vim +/rcu_get_gp_kthreads_prio +3174 kernel/rcu/rcutorture.c

fae4b54f28f034 kernel/rcutorture.c     Paul E. McKenney        2012-02-20  3163  
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3164) static bool rcu_torture_can_boost(void)
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3165) {
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3166) 	static int boost_warn_once;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3167) 	int prio;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3168) 
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3169) 	if (!(test_boost == 1 && cur_ops->can_boost) && test_boost != 2)
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3170) 		return false;
ea6d962e80b619 kernel/rcu/rcutorture.c Paul E. McKenney        2021-03-30  3171  	if (!cur_ops->start_gp_poll || !cur_ops->poll_gp_state)
5e59fba573e64c kernel/rcu/rcutorture.c Paul E. McKenney        2021-01-15  3172  		return false;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3173) 
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19 @3174) 	prio = rcu_get_gp_kthreads_prio();
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3175) 	if (!prio)
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3176) 		return false;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3177) 
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3178) 	if (prio < 2) {
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3179) 		if (boost_warn_once == 1)
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3180) 			return false;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3181) 
bf5b64355a3ce4 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3182) 		pr_alert("%s: WARN: RCU kthread priority too low to test boosting.  Skipping RCU boost test. Try passing rcutree.kthread_prio > 1 on the kernel command line.\n", KBUILD_MODNAME);
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3183) 		boost_warn_once = 1;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3184) 		return false;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3185) 	}
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3186) 
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3187) 	return true;
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3188) }
4babd855fd6137 kernel/rcu/rcutorture.c Joel Fernandes (Google  2018-06-19  3189) 

:::::: The code at line 3174 was first introduced by commit
:::::: 4babd855fd6137f9792117eb73b096c221a49d3c rcutorture: Add support to detect if boost kthread prio is too low

:::::: TO: Joel Fernandes (Google) <joel@joelfernandes.org>
:::::: CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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2023-08-26 10:07 [qais-yousef:sched-setscheduler-hide 2/9] kernel/rcu/rcutorture.c:3174:9: error: call to undeclared function 'rcu_get_gp_kthreads_prio'; ISO C99 and later do not support implicit function declarations kernel test robot

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