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Revision 783e391b7b5b273cd20856d8f6f4878da8ec31b3 authored by Venki Pallipadi on 10 April 2008, 16:49:58 UTC, committed by Linus Torvalds on 10 April 2008, 22:38:29 UTC 
x86: Simplify cpu_idle_wait
 
This patch also resolves hangs on boot:
	http://lkml.org/lkml/2008/2/23/263
	http://bugzilla.kernel.org/show_bug.cgi?id=10093

The bug was causing once-in-few-reboots 10-15 sec wait during boot on
certain laptops.

Earlier commit 40d6a146629b98d8e322b6f9332b182c7cbff3df added
smp_call_function in cpu_idle_wait() to kick cpus that are in tickless
idle.  Looking at cpu_idle_wait code at that time, code seemed to be
over-engineered for a case which is rarely used (while changing idle
handler).

Below is a simplified version of cpu_idle_wait, which just makes a dummy
smp_call_function to all cpus, to make them come out of old idle handler
and start using the new idle handler.  It eliminates code in the idle
loop to handle cpu_idle_wait.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent a1e58bb
Raw File
saa7127.h 
/*
    saa7127.h - definition for saa7126/7/8/9 inputs/outputs

    Copyright (C) 2006 Hans Verkuil (hverkuil@xs4all.nl)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef _SAA7127_H_
#define _SAA7127_H_

/* Enumeration for the supported input types */
enum saa7127_input_type {
	SAA7127_INPUT_TYPE_NORMAL,
	SAA7127_INPUT_TYPE_TEST_IMAGE
};

/* Enumeration for the supported output signal types */
enum saa7127_output_type {
	SAA7127_OUTPUT_TYPE_BOTH,
	SAA7127_OUTPUT_TYPE_COMPOSITE,
	SAA7127_OUTPUT_TYPE_SVIDEO,
	SAA7127_OUTPUT_TYPE_RGB,
	SAA7127_OUTPUT_TYPE_YUV_C,
	SAA7127_OUTPUT_TYPE_YUV_V
};

#endif
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