Revision 070e76cb3ffe43f6855492e77c96680c562598f0 authored by Leonid Yegoshin on 27 November 2014, 11:13:08 UTC, committed by Ralf Baechle on 27 November 2014, 16:21:56 UTC
There is a potential race when probing the TLB in TLBL/M/S exception handlers for a matching entry. Between the time we hit a TLBL/S/M exception and the time we get to execute the TLBP instruction, the HTW may have replaced the TLB entry we are interested in hence the TLB probe may fail. However, in the existing handlers, we never checked the status of the TLBP (ie check the result in the C0/Index register). We fix this by adding such a check when the core implements the HTW. If we couldn't find a matching entry, we return back and try again. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Reviewed-by: James Hogan <james.hogan@imgtec.com> Cc: <stable@vger.kernel.org> # v3.17+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8599/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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acpi.h
/******************************************************************************
*
* Name: acpi.h - Master public include file used to interface to ACPICA
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2014, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#ifndef __ACPI_H__
#define __ACPI_H__
/*
* Public include files for use by code that will interface to ACPICA.
*
* Information includes the ACPICA data types, names, exceptions, and
* external interface prototypes. Also included are the definitions for
* all ACPI tables (FADT, MADT, etc.)
*
* Note: The order of these include files is important.
*/
#include <acpi/platform/acenv.h> /* Environment-specific items */
#include <acpi/acnames.h> /* Common ACPI names and strings */
#include <acpi/actypes.h> /* ACPICA data types and structures */
#include <acpi/acexcep.h> /* ACPICA exceptions */
#include <acpi/actbl.h> /* ACPI table definitions */
#include <acpi/acoutput.h> /* Error output and Debug macros */
#include <acpi/acrestyp.h> /* Resource Descriptor structs */
#include <acpi/acpiosxf.h> /* OSL interfaces (ACPICA-to-OS) */
#include <acpi/acpixf.h> /* ACPI core subsystem external interfaces */
#include <acpi/platform/acenvex.h> /* Extra environment-specific items */
#endif /* __ACPI_H__ */
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