From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 29 Jul 2015 22:30:51 +0000 (+0200)
Subject: x86/apic: Drop local_irq_save/restore in timer callbacks
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c948c26048ecb1023d2e68222c736f7da41da498;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

x86/apic: Drop local_irq_save/restore in timer callbacks

These callbacks are called with interrupts disabled from the core
code. Fixup the local caller to disable interrupts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
---

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index ecd6705c9f4b..1dceb2732425 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -464,40 +464,27 @@ static int lapic_next_deadline(unsigned long delta,
 
 static int lapic_timer_shutdown(struct clock_event_device *evt)
 {
-	unsigned long flags;
 	unsigned int v;
 
 	/* Lapic used as dummy for broadcast ? */
 	if (evt->features & CLOCK_EVT_FEAT_DUMMY)
 		return 0;
 
-	local_irq_save(flags);
-
 	v = apic_read(APIC_LVTT);
 	v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
 	apic_write(APIC_LVTT, v);
 	apic_write(APIC_TMICT, 0);
-
-	local_irq_restore(flags);
-
 	return 0;
 }
 
 static inline int
 lapic_timer_set_periodic_oneshot(struct clock_event_device *evt, bool oneshot)
 {
-	unsigned long flags;
-
 	/* Lapic used as dummy for broadcast ? */
 	if (evt->features & CLOCK_EVT_FEAT_DUMMY)
 		return 0;
 
-	local_irq_save(flags);
-
 	__setup_APIC_LVTT(lapic_timer_frequency, oneshot, 1);
-
-	local_irq_restore(flags);
-
 	return 0;
 }
 
@@ -804,6 +791,7 @@ static int __init calibrate_APIC_clock(void)
 			cpu_relax();
 
 		/* Stop the lapic timer */
+		local_irq_disable();
 		lapic_timer_shutdown(levt);
 
 		/* Jiffies delta */
@@ -815,8 +803,8 @@ static int __init calibrate_APIC_clock(void)
 			apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
 		else
 			levt->features |= CLOCK_EVT_FEAT_DUMMY;
-	} else
-		local_irq_enable();
+	}
+	local_irq_enable();
 
 	if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
 		pr_warning("APIC timer disabled due to verification failure\n");