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authorFrederic Weisbecker <frederic@kernel.org>2017-10-27 05:42:30 +0300
committerIngo Molnar <mingo@kernel.org>2017-10-27 10:55:26 +0300
commit9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41 (patch)
tree47ac71593c6b4b6701373b03cacbd07a961a3d36 /include/linux/sched
parent13316b31fdaaa45f06793eb7992588359ba6ab9f (diff)
downloadlinux-9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41.tar.xz
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>
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/isolation.h17
1 files changed, 6 insertions, 11 deletions
diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index b7cfbc46286c..040df04fa78a 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