ACPI: Don't let acpi_pad needlessly mark TSC unstable

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acpi pad driver kind of aggressively marks TSC as unstable at init
time, on mwait capable and non X86_FEATURE_NONSTOP_TSC systems. This is
irrespective of whether pad driver is ever going to be used on the
system or deep C-states are supported/used. This will affect every user
who just happens to compile in (or get a kernel version which
compiles in) acpi pad driver.

Move mark_tsc_unstable() out of init to the actual idle invocation path
of the pad driver.

There is also another bug/missing_feature in the code that it does not
support 'always running apic timer' and switches to broadcast mode
unconditionally. Shaohua, can you take a look at that please.

Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Len Brown <len.brown@intel.com>

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Venkatesh Pallipadi 2010-05-18 14:39:16 -07:00 • committed by Len Brown

parent b6fecaa868

commit 0dc698b93f

1 changed files with 11 additions and 2 deletions

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drivers/acpi/acpi_pad.c

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