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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 <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Link: http://lkml.kernel.org/r/1509072159-31808-4-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2017-10-27 04:42:30 +02:00 committed by Ingo Molnar
parent 13316b31fd
commit 9f0ca2d97e
1 changed files with 8 additions and 13 deletions
include/linux/sched
isolation.h

21
include/linux/sched/isolation.h
View File

@ -7,24 +7,19 @@
#ifdef CONFIG_NO_HZ_FULL #ifdef CONFIG_NO_HZ_FULL
extern cpumask_var_t housekeeping_mask; 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); extern void __init housekeeping_init(void);
#else #else
static inline int housekeeping_any_cpu(void)
{
return smp_processor_id();
}
static inline void housekeeping_init(void) { } static inline void housekeeping_init(void) { }
#endif /* CONFIG_NO_HZ_FULL */ #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 const struct cpumask *housekeeping_cpumask(void) static inline const struct cpumask *housekeeping_cpumask(void)
{ {