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authorPavel Tatashin <pasha.tatashin@oracle.com>2018-07-30 09:52:52 -0400
committerThomas Gleixner <tglx@linutronix.de>2018-07-30 19:33:35 +0200
commitbd9f943e5d2a42d864f9692477a25034c9d47dcc (patch)
tree428f0064f6722f0bef7c24e5fd5243549ea6be3d /kernel/sched
parent684ad537abff987886d63fb3c573eeca40d7f2db (diff)
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
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/clock.c2
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)