From 2e7c28382b8426c6b7ac6f147177a664065f95f4 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Fri, 23 Mar 2007 11:32:31 -0700
Subject: [PATCH] x86-64: add "local_apic_timer_c2_ok" here too
Needed for any architecture that claims ARCH_APICTIMER_STOPS_ON_C3,
not just i386.
I'm hoping Thomas will clean this up a bit later..
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
Documentation/kernel-parameters.txt | 2 +-
arch/x86_64/kernel/apic.c | 11 +++++++++++
include/asm-x86_64/apic.h | 1 +
3 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 09640a8f7cebf..ef2ffded13928 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -780,7 +780,7 @@ and is between 256 and 4096 characters. It is defined in the file
lapic [IA-32,APIC] Enable the local APIC even if BIOS
disabled it.
- lapic_timer_c2_ok [IA-32,APIC] trust the local apic timer in
+ lapic_timer_c2_ok [IA-32,x86-64,APIC] trust the local apic timer in
C2 power state.
lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 723417d924c09..46acf4f2f1ec9 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -47,6 +47,10 @@ int apic_calibrate_pmtmr __initdata;
int disable_apic_timer __initdata;
+/* Local APIC timer works in C2? */
+int local_apic_timer_c2_ok;
+EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
+
static struct resource *ioapic_resources;
static struct resource lapic_resource = {
.name = "Local APIC",
@@ -1192,6 +1196,13 @@ static __init int setup_nolapic(char *str)
}
early_param("nolapic", setup_nolapic);
+static int __init parse_lapic_timer_c2_ok(char *arg)
+{
+ local_apic_timer_c2_ok = 1;
+ return 0;
+}
+early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
+
static __init int setup_noapictimer(char *str)
{
if (str[0] != ' ' && str[0] != 0)
diff --git a/include/asm-x86_64/apic.h b/include/asm-x86_64/apic.h
index e81d0f289f0b0..7cfb39cbd9185 100644
--- a/include/asm-x86_64/apic.h
+++ b/include/asm-x86_64/apic.h
@@ -102,5 +102,6 @@ void switch_ipi_to_APIC_timer(void *cpumask);
#define ARCH_APICTIMER_STOPS_ON_C3 1
extern unsigned boot_cpu_id;
+extern int local_apic_timer_c2_ok;
#endif /* __ASM_APIC_H */
--
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