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ACPI: Reintroduce run time configurable max_cstate for !CPU_IDLE case 

This was writeable in 2.6.23 but the cpuidle merge made it read-only.  But
some people's scripts (ie: Mark's) were writing to it.

As an unhappy compromise, make max_cstate writeable again if the kernel was
configured without CONFIG_CPU_IDLE.

http://bugzilla.kernel.org/show_bug.cgi?id=9683

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Mark Lord <lkml@rtr.ca>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venki Pallipadi 2008-01-07 17:50:10 -05:00 committed by Len Brown
parent 3ce5445046
commit 5b3f0e6c1c
1 changed files with 4 additions and 0 deletions
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4
drivers/acpi/processor_idle.c
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@ -76,7 +76,11 @@ static void (*pm_idle_save) (void) __read_mostly;
#define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
#ifdef CONFIG_CPU_IDLE
module_param(max_cstate, uint, 0000);
#else
module_param(max_cstate, uint, 0644);
#endif
static unsigned int nocst __read_mostly;
module_param(nocst, uint, 0000);