1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or https://opensource.org/licenses/CDDL-1.0. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2023, 2024, Klara Inc. 24 * Copyright (c) 2024, Rob Norris <robn@despairlabs.com> 25 */ 26 27 #ifndef _ZFS_MM_COMPAT_H 28 #define _ZFS_MM_COMPAT_H 29 30 #include <linux/mm.h> 31 #include <linux/pagemap.h> 32 33 /* 5.4 introduced page_size(). Older kernels can use a trivial macro instead */ 34 #ifndef HAVE_MM_PAGE_SIZE 35 #define page_size(p) ((unsigned long)(PAGE_SIZE << compound_order(p))) 36 #endif 37 38 /* 6.11 removed page_mapping(). A simple wrapper around folio_mapping() works */ 39 #ifndef HAVE_MM_PAGE_MAPPING 40 #define page_mapping(p) folio_mapping(page_folio(p)) 41 #endif 42 43 /* 44 * 6.12 removed PG_error, SetPageError and ClearPageError, with no direct 45 * replacement, because page writeback errors are recorded elsewhere. Since we 46 * only use the page cache to assist with mmap(), never directly backing it 47 * with IO, it shouldn't be possible for this condition to occur on our pages 48 * anyway, even if this is the right way to report it. So it should be safe 49 * to remove, but for avoidance of doubt, we make it a no-op on 6.12 and leave 50 * it for everything else. 51 */ 52 #ifndef HAVE_MM_PAGE_FLAG_ERROR 53 #define SetPageError(p) do {} while (0) 54 #define ClearPageError(p) do {} while (0) 55 #endif 56 57 #endif /* _ZFS_MM_COMPAT_H */ 58