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| author | Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> | 2009-05-22 02:09:10 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-05-28 03:57:30 +0200 |
| commit | ee1ca48fae7e575d5e399d4fdcfe0afc1212a64c (patch) | |
| tree | d2d8c9bd4a806e603ba272a7f71644af1fdb16a3 /drivers/acpi/processor_idle.c | |
| parent | Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kern... (diff) | |
| download | linux-ee1ca48fae7e575d5e399d4fdcfe0afc1212a64c.tar.xz linux-ee1ca48fae7e575d5e399d4fdcfe0afc1212a64c.zip | |
ACPI: Disable ARB_DISABLE on platforms where it is not needed
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>
Diffstat (limited to 'drivers/acpi/processor_idle.c')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 72069ba5f1ed..4840c79fd8e0 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -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) { |