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Date: Mon, 18 Sep 2017 15:54:00 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: Ingo Molnar <mingo@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Frederic Weisbecker <fweisbec@...il.com>, Peter Zijlstra <peterz@...radead.org>, Chris Metcalf <cmetcalf@...lanox.com>, Thomas Gleixner <tglx@...utronix.de>, Luiz Capitulino <lcapitulino@...hat.com>, Christoph Lameter <cl@...ux.com>, "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>, Wanpeng Li <kernellwp@...il.com> Subject: [PATCH 03/12] housekeeping: 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 <fweisbec@...il.com> Cc: Chris Metcalf <cmetcalf@...lanox.com> Cc: Rik van Riel <riel@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Mike Galbraith <efault@....de> Cc: Ingo Molnar <mingo@...nel.org> Cc: Christoph Lameter <cl@...ux.com> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Cc: Wanpeng Li <kernellwp@...il.com> Cc: Luiz Capitulino <lcapitulino@...hat.com> --- include/linux/housekeeping.h | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/include/linux/housekeeping.h b/include/linux/housekeeping.h index 3d6a8e6..64d0ee5 100644 --- a/include/linux/housekeeping.h +++ b/include/linux/housekeeping.h @@ -7,24 +7,19 @@ #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 int housekeeping_any_cpu(void) -{ - return smp_processor_id(); -} - 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 const struct cpumask *housekeeping_cpumask(void) { -- 2.7.4
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