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| author | john stultz <johnstul@us.ibm.com> | 2006-06-26 00:25:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:21 -0700 |
| commit | 539eb11e6e904f2cd4f62908cc5e44d724879721 (patch) | |
| tree | df18c747c5226b138862fb19fad5b1527055b9c9 /drivers/acpi/processor_idle.c | |
| parent | 8d016ef1380a2a9a5ca5742ede04334199868f82 (diff) | |
| download | lwn-539eb11e6e904f2cd4f62908cc5e44d724879721.tar.gz lwn-539eb11e6e904f2cd4f62908cc5e44d724879721.zip | |
[PATCH] Time: i386 Conversion - part 2: Rework TSC Support
As part of the i386 conversion to the generic timekeeping infrastructure, this
introduces a new tsc.c file. The code in this file replaces the TSC
initialization, management and access code currently in timer_tsc.c (which
will be removed) that we want to preserve.
The code also introduces the following functionality:
o tsc_khz: like cpu_khz but stores the TSC frequency on systems that do not
change TSC frequency w/ CPU frequency
o check/mark_tsc_unstable: accessor/modifier flag for TSC timekeeping
usability
o minor cleanups to calibration math.
This patch also includes a one line __cpuinitdata fix from Zwane Mwaikambo.
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/acpi/processor_idle.c')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 3b97a5eae9e8..a5f4f2aa007a 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -369,6 +369,11 @@ static void acpi_processor_idle(void) t2 = inl(acpi_fadt.xpm_tmr_blk.address); /* Get end time (ticks) */ t2 = inl(acpi_fadt.xpm_tmr_blk.address); + +#ifdef CONFIG_GENERIC_TIME + /* TSC halts in C2, so notify users */ + mark_tsc_unstable(); +#endif /* Re-enable interrupts */ local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); @@ -409,6 +414,10 @@ static void acpi_processor_idle(void) ACPI_MTX_DO_NOT_LOCK); } +#ifdef CONFIG_GENERIC_TIME + /* TSC halts in C3, so notify users */ + mark_tsc_unstable(); +#endif /* Re-enable interrupts */ local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); |