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authorPeter Zijlstra <peterz@infradead.org>2017-04-21 13:46:57 +0300
committerIngo Molnar <mingo@kernel.org>2017-05-15 11:15:21 +0300
commit2e44b7ddf8ab01cf98106c68388f87af15fbde73 (patch)
treee0bb9507fc4d61957b10858a2caf87e616c7332a /include/linux/sched
parentf9fccdb9efef60dbcf84d493514b475c41aa866f (diff)
downloadlinux-2e44b7ddf8ab01cf98106c68388f87af15fbde73.tar.xz
sched/clock: Use late_initcall() instead of sched_init_smp()
Core2 marks its TSC unstable in ACPI Processor Idle, which is probed after sched_init_smp(). Luckily it appears both acpi_processor and intel_idle (which has a similar check) are mandatory built-in. This means we can delay switching to stable until after these drivers have ran (if they were modules, this would be impossible). Delay the stable switch to late_initcall() to allow these drivers to mark TSC unstable and avoid difficult stable->unstable transitions. Reported-by: Lofstedt, Marta <marta.lofstedt@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/clock.h5
1 files changed, 0 insertions, 5 deletions
diff --git a/include/linux/sched/clock.h b/include/linux/sched/clock.h
index 9c36f0722966..a55600ffdf4b 100644
--- a/include/linux/sched/clock.h
+++ b/include/linux/sched/clock.h
@@ -23,10 +23,6 @@ extern u64 sched_clock_cpu(int cpu);
extern void sched_clock_init(void);
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
-static inline void sched_clock_init_late(void)
-{
-}
-
static inline void sched_clock_tick(void)
{
}
@@ -53,7 +49,6 @@ static inline u64 local_clock(void)
return sched_clock();
}
#else
-extern void sched_clock_init_late(void);
extern int sched_clock_stable(void);
extern void clear_sched_clock_stable(void);