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linux 5.4 compat: page_size()

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Before 5.4 we have to do a little math.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Closes #15533
Closes #15588
(cherry picked from commit df04efe321)
This commit is contained in:
Rob Norris 2023-11-13 17:55:29 +11:00 committed by Brian Behlendorf
parent 58211157bf
commit 220bb7341e
4 changed files with 56 additions and 0 deletions
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17
config/kernel-mm-page-size.m4 Normal file
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@ -0,0 +1,17 @@
AC_DEFUN([ZFS_AC_KERNEL_SRC_MM_PAGE_SIZE], [
ZFS_LINUX_TEST_SRC([page_size], [
#include <linux/mm.h>
],[
unsigned long s;
s = page_size(NULL);
])
])
AC_DEFUN([ZFS_AC_KERNEL_MM_PAGE_SIZE], [
AC_MSG_CHECKING([whether page_size() is available])
ZFS_LINUX_TEST_RESULT([page_size], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_MM_PAGE_SIZE, 1, [page_size() is available])
],[
AC_MSG_RESULT(no)
])
])

2
config/kernel.m4
View File

@ -167,6 +167,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_SRC_COPY_SPLICE_READ
ZFS_AC_KERNEL_SRC_SYNC_BDEV
ZFS_AC_KERNEL_SRC_MM_PAGE_SIZE
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@ -316,6 +317,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
ZFS_AC_KERNEL_COPY_SPLICE_READ
ZFS_AC_KERNEL_SYNC_BDEV
ZFS_AC_KERNEL_MM_PAGE_SIZE
case "$host_cpu" in
powerpc*)
ZFS_AC_KERNEL_CPU_HAS_FEATURE

1
include/os/linux/Makefile.am
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@ -5,6 +5,7 @@ kernel_linux_HEADERS = \
%D%/kernel/linux/compiler_compat.h \
%D%/kernel/linux/dcache_compat.h \
%D%/kernel/linux/kmap_compat.h \
%D%/kernel/linux/mm_compat.h \
%D%/kernel/linux/mod_compat.h \
%D%/kernel/linux/page_compat.h \
%D%/kernel/linux/percpu_compat.h \

36
include/os/linux/kernel/linux/mm_compat.h Normal file
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@ -0,0 +1,36 @@
/*
* 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 https://opensource.org/licenses/CDDL-1.0.
* 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) 2023, 2024, Klara Inc.
*/
#ifndef _ZFS_MM_COMPAT_H
#define _ZFS_MM_COMPAT_H
#include <linux/mm.h>
/* 5.4 introduced page_size(). Older kernels can use a trivial macro instead */
#ifndef HAVE_MM_PAGE_SIZE
#define page_size(p) ((unsigned long)(PAGE_SIZE << compound_order(p)))
#endif
#endif /* _ZFS_MM_COMPAT_H */