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[PATCH] hrtimer: round up relative start time on low-res arches

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CONFIG_TIME_LOW_RES is a temporary way for architectures to signal that
they simply return xtime in do_gettimeoffset().  In this corner-case we
want to round up by resolution when starting a relative timer, to avoid
short timeouts.  This will go away with the GTOD framework.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-02-14 13:53:15 -08:00 committed by Linus Torvalds
parent e35a6619e7
commit 06027bdd27
7 changed files with 37 additions and 1 deletions
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4
arch/frv/Kconfig
View File

@ -25,6 +25,10 @@ config GENERIC_HARDIRQS
bool bool
default n default n
config TIME_LOW_RES
bool
default y
mainmenu "Fujitsu FR-V Kernel Configuration" mainmenu "Fujitsu FR-V Kernel Configuration"
source "init/Kconfig" source "init/Kconfig"

4
arch/h8300/Kconfig
View File

@ -33,6 +33,10 @@ config GENERIC_CALIBRATE_DELAY
bool bool
default y default y
config TIME_LOW_RES
bool
default y
config ISA config ISA
bool bool
default y default y

4
arch/m68k/Kconfig
View File

@ -21,6 +21,10 @@ config GENERIC_CALIBRATE_DELAY
bool bool
default y default y
config TIME_LOW_RES
bool
default y
config ARCH_MAY_HAVE_PC_FDC config ARCH_MAY_HAVE_PC_FDC
bool bool
depends on Q40 || (BROKEN && SUN3X) depends on Q40 || (BROKEN && SUN3X)

4
arch/m68knommu/Kconfig
View File

@ -29,6 +29,10 @@ config GENERIC_CALIBRATE_DELAY
bool bool
default y default y
config TIME_LOW_RES
bool
default y
source "init/Kconfig" source "init/Kconfig"
menu "Processor type and features" menu "Processor type and features"

5
arch/parisc/Kconfig
View File

@ -29,6 +29,11 @@ config GENERIC_CALIBRATE_DELAY
bool bool
default y default y
config TIME_LOW_RES
bool
depends on SMP
default y
config GENERIC_ISA_DMA config GENERIC_ISA_DMA
bool bool

4
arch/v850/Kconfig
View File

@ -28,6 +28,10 @@ config GENERIC_IRQ_PROBE
bool bool
default y default y
config TIME_LOW_RES
bool
default y
# Turn off some random 386 crap that can affect device config # Turn off some random 386 crap that can affect device config
config ISA config ISA
bool bool

13
kernel/hrtimer.c
View File

@ -418,8 +418,19 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
/* Switch the timer base, if necessary: */ /* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base); new_base = switch_hrtimer_base(timer, base);
if (mode == HRTIMER_REL) if (mode == HRTIMER_REL) {
tim = ktime_add(tim, new_base->get_time()); tim = ktime_add(tim, new_base->get_time());
/*
* CONFIG_TIME_LOW_RES is a temporary way for architectures
* to signal that they simply return xtime in
* do_gettimeoffset(). In this case we want to round up by
* resolution when starting a relative timer, to avoid short
* timeouts. This will go away with the GTOD framework.
*/
#ifdef CONFIG_TIME_LOW_RES
tim = ktime_add(tim, base->resolution);
#endif
}
timer->expires = tim; timer->expires = tim;
enqueue_hrtimer(timer, new_base); enqueue_hrtimer(timer, new_base);