Re: [PATCH v2 2/2] cpuhp: Expedite RCU grace periods during SMT operations
From: kernel test robot
Date: Mon Feb 16 2026 - 11:05:32 EST
Hi Vishal,
kernel test robot noticed the following build errors:
[auto build test ERROR on next-20260213]
[also build test ERROR on linus/master]
[cannot apply to tip/smp/core rcu/rcu/dev v6.19 v6.19-rc8 v6.19-rc7 v6.19]
[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/Vishal-Chourasia/cpuhp-Optimize-SMT-switch-operation-by-batching-lock-acquisition/20260216-202247
base: next-20260213
patch link: https://lore.kernel.org/r/20260216121927.489062-6-vishalc%40linux.ibm.com
patch subject: [PATCH v2 2/2] cpuhp: Expedite RCU grace periods during SMT operations
config: alpha-allnoconfig (https://download.01.org/0day-ci/archive/20260217/202602170042.5jdtaQeu-lkp@xxxxxxxxx/config)
compiler: alpha-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260217/202602170042.5jdtaQeu-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602170042.5jdtaQeu-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
In file included from kernel/rcu/update.c:50:
>> kernel/rcu/rcu.h:515:20: error: static declaration of 'rcu_expedite_gp' follows non-static declaration
515 | static inline void rcu_expedite_gp(void) { }
| ^~~~~~~~~~~~~~~
In file included from include/linux/rbtree.h:24,
from include/linux/mm_types.h:11,
from include/linux/mmzone.h:22,
from include/linux/topology.h:34,
from include/linux/irq.h:19,
from include/asm-generic/hardirq.h:17,
from arch/alpha/include/asm/hardirq.h:8,
from include/linux/hardirq.h:11,
from include/linux/interrupt.h:11,
from kernel/rcu/update.c:25:
include/linux/rcupdate.h:1193:13: note: previous declaration of 'rcu_expedite_gp' with type 'void(void)'
1193 | extern void rcu_expedite_gp(void);
| ^~~~~~~~~~~~~~~
>> kernel/rcu/rcu.h:516:20: error: static declaration of 'rcu_unexpedite_gp' follows non-static declaration
516 | static inline void rcu_unexpedite_gp(void) { }
| ^~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:1194:13: note: previous declaration of 'rcu_unexpedite_gp' with type 'void(void)'
1194 | extern void rcu_unexpedite_gp(void);
| ^~~~~~~~~~~~~~~~~
vim +/rcu_expedite_gp +515 kernel/rcu/rcu.h
2b34c43cc1671c Paul E. McKenney 2017-03-14 509
25c36329a30c8c Paul E. McKenney 2017-05-03 510 #ifdef CONFIG_TINY_RCU
25c36329a30c8c Paul E. McKenney 2017-05-03 511 /* Tiny RCU doesn't expedite, as its purpose in life is instead to be tiny. */
7414fac050d5e0 Paul E. McKenney 2017-06-12 512 static inline bool rcu_gp_is_normal(void) { return true; }
7414fac050d5e0 Paul E. McKenney 2017-06-12 513 static inline bool rcu_gp_is_expedited(void) { return false; }
6efdda8bec2900 Joel Fernandes (Google 2023-01-12 514) static inline bool rcu_async_should_hurry(void) { return false; }
7414fac050d5e0 Paul E. McKenney 2017-06-12 @515 static inline void rcu_expedite_gp(void) { }
7414fac050d5e0 Paul E. McKenney 2017-06-12 @516 static inline void rcu_unexpedite_gp(void) { }
6efdda8bec2900 Joel Fernandes (Google 2023-01-12 517) static inline void rcu_async_hurry(void) { }
6efdda8bec2900 Joel Fernandes (Google 2023-01-12 518) static inline void rcu_async_relax(void) { }
2be4686d866ad5 Frederic Weisbecker 2023-10-27 519 static inline bool rcu_cpu_online(int cpu) { return true; }
25c36329a30c8c Paul E. McKenney 2017-05-03 520 #else /* #ifdef CONFIG_TINY_RCU */
25c36329a30c8c Paul E. McKenney 2017-05-03 521 bool rcu_gp_is_normal(void); /* Internal RCU use. */
25c36329a30c8c Paul E. McKenney 2017-05-03 522 bool rcu_gp_is_expedited(void); /* Internal RCU use. */
6efdda8bec2900 Joel Fernandes (Google 2023-01-12 523) bool rcu_async_should_hurry(void); /* Internal RCU use. */
25c36329a30c8c Paul E. McKenney 2017-05-03 524 void rcu_expedite_gp(void);
25c36329a30c8c Paul E. McKenney 2017-05-03 525 void rcu_unexpedite_gp(void);
6efdda8bec2900 Joel Fernandes (Google 2023-01-12 526) void rcu_async_hurry(void);
6efdda8bec2900 Joel Fernandes (Google 2023-01-12 527) void rcu_async_relax(void);
25c36329a30c8c Paul E. McKenney 2017-05-03 528 void rcupdate_announce_bootup_oddness(void);
2be4686d866ad5 Frederic Weisbecker 2023-10-27 529 bool rcu_cpu_online(int cpu);
474d0997361c07 Paul E. McKenney 2021-04-20 530 #ifdef CONFIG_TASKS_RCU_GENERIC
e21408ceec2de5 Paul E. McKenney 2020-03-16 531 void show_rcu_tasks_gp_kthreads(void);
e0a34641eb551e Arnd Bergmann 2023-06-09 532 #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
e0a34641eb551e Arnd Bergmann 2023-06-09 533 static inline void show_rcu_tasks_gp_kthreads(void) {}
e0a34641eb551e Arnd Bergmann 2023-06-09 534 #endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */
e0a34641eb551e Arnd Bergmann 2023-06-09 535 #endif /* #else #ifdef CONFIG_TINY_RCU */
e0a34641eb551e Arnd Bergmann 2023-06-09 536
--
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