From 1d9cb470a755409ce97c3376174b1e234bd20371 Mon Sep 17 00:00:00 2001
From: Alex Chiang <achiang@hp.com>
Date: Sun, 20 Dec 2009 12:19:14 -0700
Subject: [PATCH] ACPI: processor: introduce arch_has_acpi_pdc
arch dependent helper function that tells us if we should attempt to
evaluate _PDC on this machine or not.
The x86 implementation assumes that the CPUs in the machine must be
homogeneous, and that you cannot mix CPUs of different vendors.
Cc: Tony Luck <tony.luck@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
arch/ia64/include/asm/acpi.h | 2 ++
arch/x86/include/asm/acpi.h | 7 +++++++
arch/x86/kernel/acpi/processor.c | 4 +---
drivers/acpi/processor_pdc.c | 3 +++
4 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
index 91df9686a0da..3b7888294648 100644
--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -132,6 +132,8 @@ extern int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
#endif
+static inline bool arch_has_acpi_pdc(void) { return true; }
+
#define acpi_unlazy_tlb(x)
#ifdef CONFIG_ACPI_NUMA
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index 60d2b2db0bc5..d787e6e92bd1 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -142,6 +142,13 @@ static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
return max_cstate;
}
+static inline bool arch_has_acpi_pdc(void)
+{
+ struct cpuinfo_x86 *c = &cpu_data(0);
+ return (c->x86_vendor == X86_VENDOR_INTEL ||
+ c->x86_vendor == X86_VENDOR_CENTAUR);
+}
+
#else /* !CONFIG_ACPI */
#define acpi_lapic 0
diff --git a/arch/x86/kernel/acpi/processor.c b/arch/x86/kernel/acpi/processor.c
index d85d1b2432ba..bcb6efe08c5d 100644
--- a/arch/x86/kernel/acpi/processor.c
+++ b/arch/x86/kernel/acpi/processor.c
@@ -79,9 +79,7 @@ void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
struct cpuinfo_x86 *c = &cpu_data(pr->id);
pr->pdc = NULL;
- if (c->x86_vendor == X86_VENDOR_INTEL ||
- c->x86_vendor == X86_VENDOR_CENTAUR)
- init_intel_pdc(pr, c);
+ init_intel_pdc(pr, c);
return;
}
diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
index b416c32dda04..931e735e9e37 100644
--- a/drivers/acpi/processor_pdc.c
+++ b/drivers/acpi/processor_pdc.c
@@ -69,6 +69,9 @@ static int acpi_processor_eval_pdc(struct acpi_processor *pr)
void acpi_processor_set_pdc(struct acpi_processor *pr)
{
+ if (arch_has_acpi_pdc() == false)
+ return;
+
arch_acpi_processor_init_pdc(pr);
acpi_processor_eval_pdc(pr);
arch_acpi_processor_cleanup_pdc(pr);
--
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