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

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Patch from Nicolas Pitre

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre
2005-09-01 12:48:47 +01:00
committed by Russell King
parent 5c53ff088c
commit 20e9126808
2 changed files with 12 additions and 12 deletions
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7
arch/arm/mach-pxa/time.c
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@ -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