Commit-ID: 9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41 Gitweb: https://git.kernel.org/tip/9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41 Author: Frederic Weisbecker <frede...@kernel.org> AuthorDate: Fri, 27 Oct 2017 04:42:30 +0200 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Fri, 27 Oct 2017 09:55:26 +0200
sched/isolation: Provide a dynamic off-case to housekeeping_any_cpu() housekeeping_any_cpu() doesn't handle correctly the case where CONFIG_NO_HZ_FULL=y and no CPU is in nohz_full mode. So far no caller needs this but let's prepare to avoid any future surprise. Signed-off-by: Frederic Weisbecker <frede...@kernel.org> Acked-by: Thomas Gleixner <t...@linutronix.de> Cc: Chris Metcalf <cmetc...@mellanox.com> Cc: Christoph Lameter <c...@linux.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Luiz Capitulino <lcapitul...@redhat.com> Cc: Mike Galbraith <efa...@gmx.de> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rik van Riel <r...@redhat.com> Cc: Wanpeng Li <kernel...@gmail.com> Link: http://lkml.kernel.org/r/1509072159-31808-4-git-send-email-frede...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- include/linux/sched/isolation.h | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index b7cfbc4..040df04 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -7,25 +7,20 @@ #ifdef CONFIG_NO_HZ_FULL extern cpumask_var_t housekeeping_mask; - -static inline int housekeeping_any_cpu(void) -{ - return cpumask_any_and(housekeeping_mask, cpu_online_mask); -} - extern void __init housekeeping_init(void); - #else +static inline void housekeeping_init(void) { } +#endif /* CONFIG_NO_HZ_FULL */ static inline int housekeeping_any_cpu(void) { +#ifdef CONFIG_NO_HZ_FULL + if (tick_nohz_full_enabled()) + return cpumask_any_and(housekeeping_mask, cpu_online_mask); +#endif return smp_processor_id(); } -static inline void housekeeping_init(void) { } -#endif /* CONFIG_NO_HZ_FULL */ - - static inline const struct cpumask *housekeeping_cpumask(void) { #ifdef CONFIG_NO_HZ_FULL
