1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * This file and its contents are supplied under the terms of the 4 * Common Development and Distribution License ("CDDL"), version 1.0. 5 * You may only use this file in accordance with the terms of version 6 * 1.0 of the CDDL. 7 * 8 * A full copy of the text of the CDDL should have accompanied this 9 * source. A copy of the CDDL is also available via the Internet at 10 * https://opensource.org/license/CDDL-1.0. 11 */ 12 13 /* 14 * Copyright (c) 2023, 2024, Klara Inc. 15 * Copyright (c) 2024, Rob Norris <robn@despairlabs.com> 16 */ 17 18 #ifndef _ZFS_MM_COMPAT_H 19 #define _ZFS_MM_COMPAT_H 20 21 #include <linux/mm.h> 22 #include <linux/pagemap.h> 23 24 /* 5.4 introduced page_size(). Older kernels can use a trivial macro instead */ 25 #ifndef HAVE_MM_PAGE_SIZE 26 #define page_size(p) ((unsigned long)(PAGE_SIZE << compound_order(p))) 27 #endif 28 29 /* 6.11 removed page_mapping(). A simple wrapper around folio_mapping() works */ 30 #ifndef HAVE_MM_PAGE_MAPPING 31 #define page_mapping(p) folio_mapping(page_folio(p)) 32 #endif 33 34 /* 35 * 6.12 removed PG_error, SetPageError and ClearPageError, with no direct 36 * replacement, because page writeback errors are recorded elsewhere. Since we 37 * only use the page cache to assist with mmap(), never directly backing it 38 * with IO, it shouldn't be possible for this condition to occur on our pages 39 * anyway, even if this is the right way to report it. So it should be safe 40 * to remove, but for avoidance of doubt, we make it a no-op on 6.12 and leave 41 * it for everything else. 42 */ 43 #ifndef HAVE_MM_PAGE_FLAG_ERROR 44 #define SetPageError(p) do {} while (0) 45 #define ClearPageError(p) do {} while (0) 46 #endif 47 48 #endif /* _ZFS_MM_COMPAT_H */ 49