From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
Subject: Teach acpi how to get power-of-two
Date: Sat, 28 Feb 2004 16:44:44 +0100
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To: ACPI mailing list <acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>, Rusty trivial patch monkey Russell <trivial-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
List-Id: linux-acpi@vger.kernel.org

Hi!

I do not know why ACPI people did this... computing 1<<x using lookup
table. Its not even funny. Please apply,


								Pavel

--- tmp/linux/drivers/acpi/processor.c	2004-02-20 12:29:21.000000000 +0100
+++ linux/drivers/acpi/processor.c	2004-02-28 15:30:52.000000000 +0100
@@ -66,9 +66,6 @@
 #define C2_OVERHEAD			4	/* 1us (3.579 ticks per us) */
 #define C3_OVERHEAD			4	/* 1us (3.579 ticks per us) */
 
-
-const u32 POWER_OF_2[] = {1,2,4,8,16,32,64};
-
 #define ACPI_PROCESSOR_LIMIT_USER	0
 #define ACPI_PROCESSOR_LIMIT_THERMAL	1
 
@@ -1489,7 +1486,7 @@
 		return_VALUE(0);
 	}
 
-	pr->throttling.state_count = POWER_OF_2[acpi_fadt.duty_width];
+	pr->throttling.state_count = 1<<acpi_fadt.duty_width;
 
 	/*
 	 * Compute state values. Note that throttling displays a linear power/

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]


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