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Merge tag 'timers-nohz-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull NOHZ update from Thomas Gleixner:
 "Remove TIF_NOHZ from three architectures

  These architectures use a static key to decide whether context
  tracking needs to be invoked and the TIF_NOHZ flag just causes a
  pointless slowpath execution for nothing"

* tag 'timers-nohz-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  arm64: Remove TIF_NOHZ
  arm: Remove TIF_NOHZ
  x86: Remove TIF_NOHZ
  context-tracking: Introduce CONFIG_HAVE_TIF_NOHZ
  x86/entry: Remove _TIF_NOHZ from _TIF_WORK_SYSCALL_ENTRY
This commit is contained in:
Linus Torvalds
2020-03-30 18:29:05 -07:00
parent 992a1a3b45 e4970c9c54
commit 336622e9fc
8 changed files with 19 additions and 17 deletions
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2
kernel/context_tracking.c
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@@ -198,11 +198,13 @@ void __init context_tracking_cpu_set(int cpu)
if (initialized)
return;
#ifdef CONFIG_HAVE_TIF_NOHZ
/*
* Set TIF_NOHZ to init/0 and let it propagate to all tasks through fork
* This assumes that init is the only task at this early boot stage.
*/
set_tsk_thread_flag(&init_task, TIF_NOHZ);
#endif
WARN_ON_ONCE(!tasklist_empty());
initialized = true;