From 4fcb2fcd4d0678b8ae103d257dcb28074cbfc7fa Mon Sep 17 00:00:00 2001 From: Venkatesh Pallipadi Date: Mon, 11 Feb 2008 17:46:31 -0800 Subject: ACPI, cpuidle: Clarify C-state description in sysfs Add a new sysfs entry under cpuidle states. desc - can be used by driver to communicate to userspace any specific information about the state. This helps in identifying the exact hardware C-states behind the ACPI C-state definition. Idea is to export this through powertop, which will help to map the C-state reported by powertop to actual hardware C-state. Signed-off-by: Venkatesh Pallipadi Signed-off-by: Len Brown --- arch/x86/kernel/acpi/cstate.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index 10b67170b133..8ca3557a6d59 100644 --- a/arch/x86/kernel/acpi/cstate.c +++ b/arch/x86/kernel/acpi/cstate.c @@ -126,6 +126,8 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu, printk(KERN_DEBUG "Monitor-Mwait will be used to enter C-%d " "state\n", cx->type); } + snprintf(cx->desc, ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x", + cx->address); out: set_cpus_allowed(current, saved_mask); -- cgit v1.2.3