From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun, 1 Nov 2015 19:39:03 +0000 (-0800)
Subject: Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: v4.3~3
X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=f5eab26701999b1aa26d06772e013b11c4a16f6a;hp=4bf690d7e09bbac43dfac9af01ba263e08f37e3e

Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fixes from Thomas Gleixner:
 "The last round of minimalistic fixes for clocksource drivers:

   - Prevent multiple shutdown of the sh_mtu2 clocksource

   - Annotate a bunch of clocksource/schedclock functions with notrace
     to prevent an annoying ftrace recursion issue"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/drivers/sh_mtu2: Fix multiple shutdown call issue
  clocksource/drivers/digicolor: Prevent ftrace recursion
  clocksource/drivers/fsl_ftm_timer: Prevent ftrace recursion
  clocksource/drivers/vf_pit_timer: Prevent ftrace recursion
  clocksource/drivers/prima2: Prevent ftrace recursion
  clocksource/drivers/samsung_pwm_timer: Prevent ftrace recursion
  clocksource/drivers/pistachio: Prevent ftrace recursion
  clocksource/drivers/arm_global_timer: Prevent ftrace recursion
---

diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index 29ea50ac366a..a2cb6fae9295 100644
--- a/drivers/clocksource/arm_global_timer.c
+++ b/drivers/clocksource/arm_global_timer.c
@@ -60,7 +60,7 @@ static struct clock_event_device __percpu *gt_evt;
  *  different to the 32-bit upper value read previously, go back to step 2.
  *  Otherwise the 64-bit timer counter value is correct.
  */
-static u64 gt_counter_read(void)
+static u64 notrace _gt_counter_read(void)
 {
 	u64 counter;
 	u32 lower;
@@ -79,6 +79,11 @@ static u64 gt_counter_read(void)
 	return counter;
 }
 
+static u64 gt_counter_read(void)
+{
+	return _gt_counter_read();
+}
+
 /**
  * To ensure that updates to comparator value register do not set the
  * Interrupt Status Register proceed as follows:
@@ -201,7 +206,7 @@ static struct clocksource gt_clocksource = {
 #ifdef CONFIG_CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
 static u64 notrace gt_sched_clock_read(void)
 {
-	return gt_counter_read();
+	return _gt_counter_read();
 }
 #endif
 
diff --git a/drivers/clocksource/fsl_ftm_timer.c b/drivers/clocksource/fsl_ftm_timer.c
index ef434699c80a..10202f1fdfd7 100644
--- a/drivers/clocksource/fsl_ftm_timer.c
+++ b/drivers/clocksource/fsl_ftm_timer.c
@@ -118,7 +118,7 @@ static inline void ftm_reset_counter(void __iomem *base)
 	ftm_writel(0x00, base + FTM_CNT);
 }
 
-static u64 ftm_read_sched_clock(void)
+static u64 notrace ftm_read_sched_clock(void)
 {
 	return ftm_readl(priv->clksrc_base + FTM_CNT);
 }
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index bc90e13338cc..9502bc4c3f6d 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -307,7 +307,7 @@ static void samsung_clocksource_resume(struct clocksource *cs)
 	samsung_time_start(pwm.source_id, true);
 }
 
-static cycle_t samsung_clocksource_read(struct clocksource *c)
+static cycle_t notrace samsung_clocksource_read(struct clocksource *c)
 {
 	return ~readl_relaxed(pwm.source_reg);
 }
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index f1985da8113f..53aa7e92a7d7 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -280,7 +280,9 @@ static int sh_mtu2_clock_event_shutdown(struct clock_event_device *ced)
 {
 	struct sh_mtu2_channel *ch = ced_to_sh_mtu2(ced);
 
-	sh_mtu2_disable(ch);
+	if (clockevent_state_periodic(ced))
+		sh_mtu2_disable(ch);
+
 	return 0;
 }
 
diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
index 18d4266c2986..bba679900054 100644
--- a/drivers/clocksource/time-pistachio.c
+++ b/drivers/clocksource/time-pistachio.c
@@ -67,7 +67,8 @@ static inline void gpt_writel(void __iomem *base, u32 value, u32 offset,
 	writel(value, base + 0x20 * gpt_id + offset);
 }
 
-static cycle_t pistachio_clocksource_read_cycles(struct clocksource *cs)
+static cycle_t notrace
+pistachio_clocksource_read_cycles(struct clocksource *cs)
 {
 	struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
 	u32 counter, overflw;
diff --git a/drivers/clocksource/timer-digicolor.c b/drivers/clocksource/timer-digicolor.c
index e73947f0f86d..a536eeb634d8 100644
--- a/drivers/clocksource/timer-digicolor.c
+++ b/drivers/clocksource/timer-digicolor.c
@@ -143,7 +143,7 @@ static irqreturn_t digicolor_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static u64 digicolor_timer_sched_read(void)
+static u64 notrace digicolor_timer_sched_read(void)
 {
 	return ~readl(dc_timer_dev.base + COUNT(TIMER_B));
 }
diff --git a/drivers/clocksource/timer-prima2.c b/drivers/clocksource/timer-prima2.c
index 78de982cc640..2854c663e8b5 100644
--- a/drivers/clocksource/timer-prima2.c
+++ b/drivers/clocksource/timer-prima2.c
@@ -73,7 +73,7 @@ static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id)
 }
 
 /* read 64-bit timer counter */
-static cycle_t sirfsoc_timer_read(struct clocksource *cs)
+static cycle_t notrace sirfsoc_timer_read(struct clocksource *cs)
 {
 	u64 cycles;
 
diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c
index f07ba9932171..a0e6c68536a1 100644
--- a/drivers/clocksource/vf_pit_timer.c
+++ b/drivers/clocksource/vf_pit_timer.c
@@ -52,7 +52,7 @@ static inline void pit_irq_acknowledge(void)
 	__raw_writel(PITTFLG_TIF, clkevt_base + PITTFLG);
 }
 
-static u64 pit_read_sched_clock(void)
+static u64 notrace pit_read_sched_clock(void)
 {
 	return ~__raw_readl(clksrc_base + PITCVAL);
 }