mirror_zfs/configure.ac
Attila Fülöp 8e94ac0e36
Linux 5.16 compat: don't use XSTATE_XSAVE to save FPU state
Linux 5.16 moved XSTATE_XSAVE and XSTATE_XRESTORE out of our reach,
so add our own XSAVE{,OPT,S} code and use it for Linux 5.16.

Please note that this differs from previous behavior in that it
won't handle exceptions created by XSAVE an XRSTOR. This is sensible
for three reasons.

 - Exceptions during XSAVE and XRSTOR can only occur if the feature
   is not supported or enabled or the memory operand isn't aligned
   on a 64 byte boundary. If this happens something else went
   terribly wrong, and it may be better to stop execution.

 - Previously we just printed a warning and didn't handle the fault,
   this is arguable for the above reason.

 - All other *SAVE instruction also don't handle exceptions, so this
   at least aligns behavior.

Finally add a test to catch such a regression in the future.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Attila Fülöp <attila@fueloep.org>
Closes #13042
Closes #13059
2022-02-09 12:50:10 -08:00

421 lines
17 KiB
Plaintext

/*
* This file is part of the ZFS Linux port.
*
* Copyright (c) 2009 Lawrence Livermore National Security, LLC.
* Produced at Lawrence Livermore National Laboratory
* Written by:
* Brian Behlendorf <behlendorf1@llnl.gov>,
* Herb Wartens <wartens2@llnl.gov>,
* Jim Garlick <garlick@llnl.gov>
* LLNL-CODE-403049
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
AC_INIT(m4_esyscmd(grep ^Name: META | cut -d ':' -f 2 | tr -d ' \n'),
m4_esyscmd(grep ^Version: META | cut -d ':' -f 2 | tr -d ' \n'))
AC_LANG(C)
ZFS_AC_META
AC_CONFIG_AUX_DIR([config])
AC_CONFIG_MACRO_DIR([config])
AC_CANONICAL_TARGET
AM_MAINTAINER_MODE
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AM_INIT_AUTOMAKE([subdir-objects])
AC_CONFIG_HEADERS([zfs_config.h], [
(mv zfs_config.h zfs_config.h.tmp &&
awk -f ${ac_srcdir}/config/config.awk zfs_config.h.tmp >zfs_config.h &&
rm zfs_config.h.tmp) || exit 1])
LT_INIT
AC_PROG_INSTALL
AC_PROG_CC
AC_PROG_LN_S
PKG_PROG_PKG_CONFIG
AM_PROG_AS
AM_PROG_CC_C_O
AX_CODE_COVERAGE
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