[tip:x86/timers] x86/hpet: Do not use smp_processor_id() in preemptible code

From: tip-bot for Borislav Petkov
Date: Tue Jun 20 2017 - 06:26:36 EST

Commit-ID: 803ff8a7a6c9f89945edc07c5e969c2e11e2209b
Gitweb: http://git.kernel.org/tip/803ff8a7a6c9f89945edc07c5e969c2e11e2209b
Author: Borislav Petkov <bp@xxxxxxx>
AuthorDate: Tue, 20 Jun 2017 11:31:54 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Tue, 20 Jun 2017 12:23:26 +0200

x86/hpet: Do not use smp_processor_id() in preemptible code

When hpet=force is supplied on the kernel command line and the HPET
supports the Legacy Replacement Interrupt Route option (HPET_ID_LEGSUP),
the legacy interrupts init code uses the boot CPU's mask initially by
calling smp_processor_id() assuming that it is running on the BSP.

It does run on the BSP but the code region is preemptible and the
preemption check fires.

Simply use the BSP's id directly to avoid the warning.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: http://lkml.kernel.org/r/20170620093154.18472-1-bp@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

arch/x86/kernel/hpet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 89ff7af..16f82a3 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -285,7 +285,7 @@ static void hpet_legacy_clockevent_register(void)
* Start hpet with the boot cpu mask and make it
* global after the IO_APIC has been initialized.
- hpet_clockevent.cpumask = cpumask_of(smp_processor_id());
+ hpet_clockevent.cpumask = cpumask_of(boot_cpu_data.cpu_index);
clockevents_config_and_register(&hpet_clockevent, hpet_freq,
global_clock_event = &hpet_clockevent;