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Add compatibility layer for {kmap,kunmap}_atomic

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Starting from linux-2.6.37, {kmap,kunmap}_atomic takes 1 argument instead of 2.
We use zfs_{kmap,kunmap}_atomic as wrappers and always take 2 argument, but
ignore the 2nd for newer kernel.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Chunwei Chen 2015-05-11 22:22:56 +08:00 committed by Brian Behlendorf
parent efc412b645
commit 17888ae30d
4 changed files with 63 additions and 1 deletions
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20
config/kernel-kmap-atomic-args.m4 Normal file
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@ -0,0 +1,20 @@
dnl #
dnl # 2.6.37 API change
dnl # kmap_atomic changed from assigning hard-coded named slot to using
dnl # push/pop based dynamical allocation.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS], [
AC_MSG_CHECKING([whether kmap_atomic wants 1 args])
ZFS_LINUX_TRY_COMPILE([
#include <linux/pagemap.h>
],[
struct page page;
kmap_atomic(&page);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_1ARG_KMAP_ATOMIC, 1,
[kmap_atomic wants 1 args])
],[
AC_MSG_RESULT(no)
])
])

1
config/kernel.m4
View File

@ -100,6 +100,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_LSEEK_EXECUTE
ZFS_AC_KERNEL_VFS_ITERATE
ZFS_AC_KERNEL_VFS_RW_ITERATE
ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"

3
include/linux/Makefile.am
View File

@ -5,7 +5,8 @@ KERNEL_H = \
$(top_srcdir)/include/linux/xattr_compat.h \
$(top_srcdir)/include/linux/vfs_compat.h \
$(top_srcdir)/include/linux/blkdev_compat.h \
$(top_srcdir)/include/linux/utsname_compat.h
$(top_srcdir)/include/linux/utsname_compat.h \
$(top_srcdir)/include/linux/kmap_compat.h
USER_H =

40
include/linux/kmap_compat.h Normal file
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@ -0,0 +1,40 @@
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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
*/
/*
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
*/
#ifndef _ZFS_KMAP_H
#define _ZFS_KMAP_H
#include <linux/highmem.h>
#ifdef HAVE_1ARG_KMAP_ATOMIC
/* 2.6.37 API change */
#define zfs_kmap_atomic(page, km_type) kmap_atomic(page)
#define zfs_kunmap_atomic(addr, km_type) kunmap_atomic(addr)
#else
#define zfs_kmap_atomic(page, km_type) kmap_atomic(page, km_type)
#define zfs_kunmap_atomic(addr, km_type) kunmap_atomic(addr, km_type)
#endif
#endif /* _ZFS_KMAP_H */