From e585bef815c0315f2730d7bb4e15b82602454efd Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 23 Mar 2007 16:08:01 +0100 Subject: [PATCH] i386: add command line option "local_apic_timer_c2_ok" It turned out that it is almost impossible to trust ACPI, BIOS & Co. regarding the C states. This was the reason to switch the local apic timer off in C2 state already. OTOH there are sane and well behaving systems, which get punished by that decision. Allow the user to confirm that the local apic timer is trustworthy in C2 state. This keeps the default behaviour on the safe side. Signed-off-by: Thomas Gleixner Acked-by: Ingo Molnar Signed-off-by: Linus Torvalds --- arch/i386/kernel/apic.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/i386') diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c index 244c3fe9b8c3..e88415282a6f 100644 --- a/arch/i386/kernel/apic.c +++ b/arch/i386/kernel/apic.c @@ -64,6 +64,9 @@ static int enable_local_apic __initdata = 0; static int local_apic_timer_verify_ok; /* Disable local APIC timer from the kernel commandline or via dmi quirk */ static int local_apic_timer_disabled; +/* Local APIC timer works in C2 */ +int local_apic_timer_c2_ok; +EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); /* * Debug level, exported for io_apic.c @@ -1232,6 +1235,13 @@ static int __init parse_disable_lapic_timer(char *arg) } early_param("nolapic_timer", parse_disable_lapic_timer); +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 int __init apic_set_verbosity(char *str) { if (strcmp("debug", str) == 0) -- cgit v1.2.2