/*===========================================================================
 Copyright (c) 2001, The Santa Cruz Operation 
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

 *Redistributions of source code must retain the above copyright notice,
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 *Redistributions in binary form must reproduce the above copyright notice,
 this list of conditions and the following disclaimer in the documentation
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 may be used to endorse or promote products derived from this software
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 IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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/* $Id: scanner.h,v 1.4 2005/01/31 16:50:33 broeker Exp $ */


#ifndef CSCOPE_SCANNER_H
#define CSCOPE_SCANNER_H

#include <stdio.h>

#undef	YYLMAX		
#define YYLMAX	STMTMAX + PATLEN + 1	/* scanner line buffer size */

/* cross-reference database mark characters (when new ones are added, 
 * update the cscope.out format description in cscope.1)
 */
#define CLASSDEF	'c'
#define	DEFINE		'#'
#define	DEFINEEND	')'
#define ENUMDEF		'e'
#define FCNCALL		'`'
#define FCNDEF		'$'
#define FCNEND		'}'
#define GLOBALDEF	'g'
#define	INCLUDE		'~'
#define MEMBERDEF	'm'
#define NEWFILE		'@'
#define STRUCTDEF	's'
#define TYPEDEF		't'
#define UNIONDEF	'u'

/* other scanner token types */
#define LEXEOF	0
#define	IDENT	1
#define	NEWLINE	2

/* scanner.l global data */
extern	int	first;		/* buffer index for first char of symbol */
extern	int	last;		/* buffer index for last char of symbol */
extern	int	lineno;		/* symbol line number */
extern	FILE	*yyin;		/* input file descriptor */
extern	FILE	*yyout;		/* output file */
extern	int	myylineno;	/* input line number */

#ifdef USING_LEX
/* HBB 20010430: if lex is used instead of flex, have to simulate the
 * private copies of yytext and yytext for the world outside scanner.l: */
/* FIXME: there should be a feature test for this! */
#if defined(__OSF1__) || defined(__sun) || defined(_AIX)
extern	char	yytext[];
#else
extern	unsigned char	yytext[];
#endif
extern	int	yyleng;
# define my_yytext yytext
# define my_yyleng yyleng
#else
extern	char	*my_yytext;	/* private copy of input line */
extern	size_t	my_yyleng;	/* ... and current length of it */
#endif

/* The master function exported by scanner.l */
int 	yylex(void);
void	initscanner(char *srcfile);

#endif /* CSCOPE_SCANNER_H ends */
225a899'>mfd</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='08d072599234c959b0b82b63fa252c129225a899'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Wanpeng Li &lt;wanpeng.li@hotmail.com&gt;</td><td class='right'>2016-09-02 14:38:23 +0800</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-09-02 10:25:40 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings/mfd?id=08d072599234c959b0b82b63fa252c129225a899'>08d072599234c959b0b82b63fa252c129225a899</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/devicetree/bindings/mfd?id=08d072599234c959b0b82b63fa252c129225a899'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=08d072599234c959b0b82b63fa252c129225a899'>7e39e250570300bc66e42d922fa80327aaf1e573</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/devicetree/bindings/mfd?id=08d072599234c959b0b82b63fa252c129225a899'>Documentation/devicetree/bindings/mfd</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/devicetree/bindings/mfd?id=98744b408c757901df57fa50cbd5826245dc3a1f'>98744b408c757901df57fa50cbd5826245dc3a1f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/devicetree/bindings/mfd?id=08d072599234c959b0b82b63fa252c129225a899&amp;id2=98744b408c757901df57fa50cbd5826245dc3a1f'>diff</a>)</td></tr></table>
<div class='commit-subject'>tick/nohz: Fix softlockup on scheduler stalls in kvm guest</div><div class='commit-msg'>tick_nohz_start_idle() is prevented to be called if the idle tick can't 
be stopped since commit 1f3b0f8243cb934 ("tick/nohz: Optimize nohz idle 
enter"). As a result, after suspend/resume the host machine, full dynticks 
kvm guest will softlockup:

 NMI watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [swapper/0:0]
 Call Trace:
  default_idle+0x31/0x1a0
  arch_cpu_idle+0xf/0x20
  default_idle_call+0x2a/0x50
  cpu_startup_entry+0x39b/0x4d0
  rest_init+0x138/0x140
  ? rest_init+0x5/0x140
  start_kernel+0x4c1/0x4ce
  ? set_init_arg+0x55/0x55
  ? early_idt_handler_array+0x120/0x120
  x86_64_start_reservations+0x24/0x26
  x86_64_start_kernel+0x142/0x14f

In addition, cat /proc/stat | grep cpu in guest or host:

cpu  398 16 5049 15754 5490 0 1 46 0 0
cpu0 206 5 450 0 0 0 1 14 0 0
cpu1 81 0 3937 3149 1514 0 0 9 0 0
cpu2 45 6 332 6052 2243 0 0 11 0 0
cpu3 65 2 328 6552 1732 0 0 11 0 0

The idle and iowait states are weird 0 for cpu0(housekeeping). 

The bug is present in both guest and host kernels, and they both have 
cpu0's idle and iowait states issue, however, host kernel's suspend/resume 
path etc will touch watchdog to avoid the softlockup.

- The watchdog will not be touched in tick_nohz_stop_idle path (need be 
  touched since the scheduler stall is expected) if idle_active flags are 
  not detected.
- The idle and iowait states will not be accounted when exit idle loop 
  (resched or interrupt) if idle start time and idle_active flags are 
  not set. 

This patch fixes it by reverting commit 1f3b0f8243cb934 since can't stop 
idle tick doesn't mean can't be idle.

Fixes: 1f3b0f8243cb934 ("tick/nohz: Optimize nohz idle enter")
Signed-off-by: Wanpeng Li &lt;wanpeng.li@hotmail.com&gt;
Cc: Sanjeev Yadav&lt;sanjeev.yadav@spreadtrum.com&gt;
Cc: Gaurav Jindal&lt;gaurav.jindal@spreadtrum.com&gt;
Cc: stable@vger.kernel.org
Cc: kvm@vger.kernel.org
Cc: Radim Krčmář &lt;rkrcmar@redhat.com&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Paolo Bonzini &lt;pbonzini@redhat.com&gt;
Link: http://lkml.kernel.org/r/1472798303-4154-1-git-send-email-wanpeng.li@hotmail.com
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=08d072599234c959b0b82b63fa252c129225a899'>Diffstat</a> (limited to 'Documentation/devicetree/bindings/mfd')</div><table summary='diffstat' class='diffstat'>