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

Pull timer fixes from Thomas Gleixner:
 "A few updates for timers & co:

   - prevent a livelock in the timekeeping code when debugging is
     enabled

   - prevent out of bounds access in the timekeeping debug code

   - various fixes in clocksource drivers

   - a new maintainers entry"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/drivers/sun4i: Clear interrupts after stopping timer in probe function
  drivers/clocksource/pistachio: Fix memory corruption in init
  clocksource/drivers/timer-atmel-pit: Enable mck clock
  clocksource/drivers/pxa: Fix include files for compilation
  MAINTAINERS: Add ARM ARCHITECTED TIMER entry
  timekeeping: Cap array access in timekeeping_debug
  timekeeping: Avoid taking lock in NMI path with CONFIG_DEBUG_TIMEKEEPING

diff --git a/MAINTAINERS b/MAINTAINERS
index fc2613d..71aa5da 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -881,6 +881,15 @@ S: Supported
 F:     drivers/gpu/drm/arc/
 F:     Documentation/devicetree/bindings/display/snps,arcpgu.txt
 
+ARM ARCHITECTED TIMER DRIVER
+M:     Mark Rutland <mark.rutland@arm.com>
+M:     Marc Zyngier <marc.zyngier@arm.com>
+L:     linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:     Maintained
+F:     arch/arm/include/asm/arch_timer.h
+F:     arch/arm64/include/asm/arch_timer.h
+F:     drivers/clocksource/arm_arch_timer.c
+
 ARM HDLCD DRM DRIVER
 M:     Liviu Dudau <liviu.dudau@arm.com>
 S:     Supported

diff --git a/drivers/clocksource/pxa_timer.c b/drivers/clocksource/pxa_timer.c
index 937e10b..3e1cb51 100644 (file)
--- a/drivers/clocksource/pxa_timer.c
+++ b/drivers/clocksource/pxa_timer.c
@@ -21,6 +21,8 @@
 #include <linux/of_irq.h>
 #include <linux/sched_clock.h>
 
+#include <clocksource/pxa.h>
+
 #include <asm/div64.h>
 
 #define OSMR0          0x00    /* OS Timer 0 Match Register */

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index 97669ee..c83452c 100644 (file)
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -123,12 +123,16 @@ static struct clock_event_device sun4i_clockevent = {
        .set_next_event = sun4i_clkevt_next_event,
 };
 
+static void sun4i_timer_clear_interrupt(void)
+{
+       writel(TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_ST_REG);
+}
 
 static irqreturn_t sun4i_timer_interrupt(int irq, void *dev_id)
 {
        struct clock_event_device *evt = (struct clock_event_device *)dev_id;
 
-       writel(0x1, timer_base + TIMER_IRQ_ST_REG);
+       sun4i_timer_clear_interrupt();
        evt->event_handler(evt);
 
        return IRQ_HANDLED;
@@ -208,6 +212,9 @@ static int __init sun4i_timer_init(struct device_node *node)
        /* Make sure timer is stopped before playing with interrupts */
        sun4i_clkevt_time_stop(0);
 
+       /* clear timer0 interrupt */
+       sun4i_timer_clear_interrupt();
+
        sun4i_clockevent.cpumask = cpu_possible_mask;
        sun4i_clockevent.irq = irq;
 

diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
index a7d9a08..a8e6c7d 100644 (file)
--- a/drivers/clocksource/time-pistachio.c
+++ b/drivers/clocksource/time-pistachio.c
@@ -202,10 +202,10 @@ static int __init pistachio_clksrc_of_init(struct device_node *node)
        rate = clk_get_rate(fast_clk);
 
        /* Disable irq's for clocksource usage */
-       gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 0);
-       gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 1);
-       gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 2);
-       gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 3);
+       gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 0);
+       gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 1);
+       gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 2);
+       gpt_writel(pcs_gpt.base, 0, TIMER_IRQ_MASK, 3);
 
        /* Enable timer block */
        writel(TIMER_ME_GLOBAL, pcs_gpt.base);

diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index 1ffac0c..3494bc5 100644 (file)
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -261,6 +261,12 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
                return PTR_ERR(data->mck);
        }
 
+       ret = clk_prepare_enable(data->mck);
+       if (ret) {
+               pr_err("Unable to enable mck\n");
+               return ret;
+       }
+
        /* Get the interrupts property */
        data->irq = irq_of_parse_and_map(node, 0);
        if (!data->irq) {

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 3b65746..e07fb09 100644 (file)
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -401,7 +401,10 @@ static __always_inline u64 __ktime_get_fast_ns(struct tk_fast *tkf)
        do {
                seq = raw_read_seqcount_latch(&tkf->seq);
                tkr = tkf->base + (seq & 0x01);
-               now = ktime_to_ns(tkr->base) + timekeeping_get_ns(tkr);
+               now = ktime_to_ns(tkr->base);
+
+               now += clocksource_delta(tkr->read(tkr->clock),
+                                        tkr->cycle_last, tkr->mask);
        } while (read_seqcount_retry(&tkf->seq, seq));
 
        return now;

diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index f6bd652..107310a 100644 (file)
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -23,7 +23,9 @@
 
 #include "timekeeping_internal.h"
 
-static unsigned int sleep_time_bin[32] = {0};
+#define NUM_BINS 32
+
+static unsigned int sleep_time_bin[NUM_BINS] = {0};
 
 static int tk_debug_show_sleep_time(struct seq_file *s, void *data)
 {
@@ -69,6 +71,9 @@ late_initcall(tk_debug_sleep_time_init);
 
 void tk_debug_account_sleep_time(struct timespec64 *t)
 {
-       sleep_time_bin[fls(t->tv_sec)]++;
+       /* Cap bin index so we don't overflow the array */
+       int bin = min(fls(t->tv_sec), NUM_BINS-1);
+
+       sleep_time_bin[bin]++;
 }