Revision 95ef1e52922cf75b1ea2eae54ef886f2cc47eecb authored by Avi Kivity on 15 November 2011, 12:59:07 UTC, committed by Avi Kivity on 20 November 2011, 08:53:48 UTC
Prevent tracing of preempt_disable() in get_cpu_var() in kvm_clock_read(). When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are traced and this causes the function_graph tracer to go into an infinite recursion. By open coding the preempt_disable() around the get_cpu_var(), we can use the notrace version which prevents preempt_disable/enable() from being traced and prevents the recursion. Based on a similar patch for Xen from Jeremy Fitzhardinge. Tested-by: Gleb Natapov <gleb@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Avi Kivity <avi@redhat.com>
1 parent bb75c62
crc.h
/*********************************************************************
*
* Filename: crc.h
* Version:
* Description: CRC routines
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Mon Aug 4 20:40:53 1997
* Modified at: Sun May 2 20:25:23 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
********************************************************************/
#ifndef IRDA_CRC_H
#define IRDA_CRC_H
#include <linux/types.h>
#include <linux/crc-ccitt.h>
#define INIT_FCS 0xffff /* Initial FCS value */
#define GOOD_FCS 0xf0b8 /* Good final FCS value */
/* Recompute the FCS with one more character appended. */
#define irda_fcs(fcs, c) crc_ccitt_byte(fcs, c)
/* Recompute the FCS with len bytes appended. */
#define irda_calc_crc16(fcs, buf, len) crc_ccitt(fcs, buf, len)
#endif
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