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| author | Pavel Tatashin <pasha.tatashin@oracle.com> | 2018-07-30 15:52:52 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-30 19:33:35 +0200 |
| commit | bd9f943e5d2a42d864f9692477a25034c9d47dcc (patch) | |
| tree | 428f0064f6722f0bef7c24e5fd5243549ea6be3d | |
| parent | timekeeping: Prevent false warning when persistent clock is not available (diff) | |
| download | linux-bd9f943e5d2a42d864f9692477a25034c9d47dcc.tar.xz linux-bd9f943e5d2a42d864f9692477a25034c9d47dcc.zip | |
sched/clock: Disable interrupts when calling generic_sched_clock_init()
sched_clock_init() used be called early during boot when interrupts were
still disabled. After the recent changes to utilize sched clock early the
sched_clock_init() call happens when interrupts are already enabled, which
triggers the following warning:
WARNING: CPU: 0 PID: 0 at kernel/time/sched_clock.c:180 sched_clock_register+0x44/0x278
[<c001a13c>] (warn_slowpath_null) from [<c052367c>] (sched_clock_register+0x44/0x278)
[<c052367c>] (sched_clock_register) from [<c05238d8>] (generic_sched_clock_init+0x28/0x88)
[<c05238d8>] (generic_sched_clock_init) from [<c0521a00>] (sched_clock_init+0x54/0x74)
[<c0521a00>] (sched_clock_init) from [<c0519c18>] (start_kernel+0x310/0x3e4)
[<c0519c18>] (start_kernel) from [<00000000>] ( (null))
Disable IRQs for the duration of generic_sched_clock_init().
Fixes: 857baa87b642 ("sched/clock: Enable sched clock early")
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: steven.sistare@oracle.com
Cc: daniel.m.jordan@oracle.com
Link: https://lkml.kernel.org/r/20180730135252.24599-1-pasha.tatashin@oracle.com
| -rw-r--r-- | kernel/sched/clock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c index 811a39aca1ce..e3e3b979f9bd 100644 --- a/kernel/sched/clock.c +++ b/kernel/sched/clock.c @@ -452,7 +452,9 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event); void __init sched_clock_init(void) { static_branch_inc(&sched_clock_running); + local_irq_disable(); generic_sched_clock_init(); + local_irq_enable(); } u64 sched_clock_cpu(int cpu) |