[ARM] 2863/1: clarify comment in PXA2xx and SA1x00 timer code

Patch from Nicolas Pitre

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c
index 72b15e9..7dad3f1 100644 (file)
--- a/arch/arm/mach-pxa/time.c
+++ b/arch/arm/mach-pxa/time.c
@@ -91,9 +91,10 @@ pxa_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
        /* Loop until we get ahead of the free running timer.
         * This ensures an exact clock tick count and time accuracy.
-        * IRQs are disabled inside the loop to ensure coherence between
-        * lost_ticks (updated in do_timer()) and the match reg value, so we
-        * can use do_gettimeofday() from interrupt handlers.
+        * Since IRQs are disabled at this point, coherence between
+        * lost_ticks(updated in do_timer()) and the match reg value is
+        * ensured, hence we can use do_gettimeofday() from interrupt
+        * handlers.
         *
         * HACK ALERT: it seems that the PXA timer regs aren't updated right
         * away in all cases when a write occurs.  We therefore compare with

diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
index 0eeb361..a084b38 100644 (file)
--- a/arch/arm/mach-sa1100/time.c
+++ b/arch/arm/mach-sa1100/time.c
@@ -70,15 +70,6 @@ static unsigned long sa1100_gettimeoffset (void)
        return usec;
 }
 
-/*
- * We will be entered with IRQs enabled.
- *
- * Loop until we get ahead of the free running timer.
- * This ensures an exact clock tick count and time accuracy.
- * IRQs are disabled inside the loop to ensure coherence between
- * lost_ticks (updated in do_timer()) and the match reg value, so we
- * can use do_gettimeofday() from interrupt handlers.
- */
 static irqreturn_t
 sa1100_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
@@ -86,6 +77,14 @@ sa1100_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
        write_seqlock(&xtime_lock);
 
+       /*
+        * Loop until we get ahead of the free running timer.
+        * This ensures an exact clock tick count and time accuracy.
+        * Since IRQs are disabled at this point, coherence between
+        * lost_ticks(updated in do_timer()) and the match reg value is
+        * ensured, hence we can use do_gettimeofday() from interrupt
+        * handlers.
+        */
        do {
                timer_tick(regs);
                OSSR = OSSR_M0;  /* Clear match on timer 0 */