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ACPI: Disable ARB_DISABLE on platforms where it is not needed

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ARB_DISABLE is a NOP on all of the recent Intel platforms.

For such platforms, reduce contention on c3_lock
by skipping the fake ARB_DISABLE.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Pallipadi, Venkatesh 2009-05-21 17:09:10 -07:00 • committed by Len Brown
parent cd86a536c8
commit ee1ca48fae
2 changed files with 18 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

7
drivers/acpi/processor_idle.c
View file

@ -512,7 +512,8 @@ static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
struct acpi_processor_cx *cx)
{
static int bm_check_flag;
static int bm_check_flag = -1;
static int bm_control_flag = -1;
if (!cx->address)
@ -542,12 +543,14 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
}
/* All the logic here assumes flags.bm_check is same across all CPUs */
if (!bm_check_flag) {
if (bm_check_flag == -1) {
/* Determine whether bm_check is needed based on CPU */
acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
bm_check_flag = pr->flags.bm_check;
bm_control_flag = pr->flags.bm_control;
} else {
pr->flags.bm_check = bm_check_flag;
pr->flags.bm_control = bm_control_flag;
}
if (pr->flags.bm_check) {