^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2014, The Linux Foundation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/set_memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct page_change_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) pgprot_t set_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) pgprot_t clear_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) bool rodata_full __ro_after_init = IS_ENABLED(CONFIG_RODATA_FULL_DEFAULT_ENABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct page_change_data *cdata = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) pte_t pte = READ_ONCE(*ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) pte = clear_pte_bit(pte, cdata->clear_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) pte = set_pte_bit(pte, cdata->set_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) set_pte(ptep, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * This function assumes that the range is mapped with PAGE_SIZE pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int __change_memory_common(unsigned long start, unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) pgprot_t set_mask, pgprot_t clear_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct page_change_data data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) data.set_mask = set_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) data.clear_mask = clear_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ret = apply_to_page_range(&init_mm, start, size, change_page_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) &data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) flush_tlb_kernel_range(start, start + size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static int change_memory_common(unsigned long addr, int numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) pgprot_t set_mask, pgprot_t clear_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned long start = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) unsigned long size = PAGE_SIZE * numpages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) unsigned long end = start + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct vm_struct *area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (!PAGE_ALIGNED(addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) start &= PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) end = start + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Kernel VA mappings are always live, and splitting live section
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * mappings into page mappings may cause TLB conflicts. This means
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * we have to ensure that changing the permission bits of the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * we are operating on does not result in such splitting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * Let's restrict ourselves to mappings created by vmalloc (or vmap).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Those are guaranteed to consist entirely of page mappings, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * splitting is never needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * So check whether the [addr, addr + size) interval is entirely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * covered by precisely one VM area that has the VM_ALLOC flag set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) area = find_vm_area((void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (!area ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) end > (unsigned long)area->addr + area->size ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) !(area->flags & VM_ALLOC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (!numpages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * If we are manipulating read-only permissions, apply the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * change to the linear mapping of the pages that back this VM area.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pgprot_val(clear_mask) == PTE_RDONLY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) for (i = 0; i < area->nr_pages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) __change_memory_common((u64)page_address(area->pages[i]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) PAGE_SIZE, set_mask, clear_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * Get rid of potentially aliasing lazily unmapped vm areas that may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * have permissions set that deviate from the ones we are setting here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) vm_unmap_aliases();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return __change_memory_common(start, size, set_mask, clear_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int set_memory_ro(unsigned long addr, int numpages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return change_memory_common(addr, numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) __pgprot(PTE_RDONLY),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) __pgprot(PTE_WRITE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int set_memory_rw(unsigned long addr, int numpages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return change_memory_common(addr, numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) __pgprot(PTE_WRITE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) __pgprot(PTE_RDONLY));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int set_memory_nx(unsigned long addr, int numpages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return change_memory_common(addr, numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) __pgprot(PTE_PXN),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) __pgprot(PTE_MAYBE_GP));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) int set_memory_x(unsigned long addr, int numpages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return change_memory_common(addr, numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) __pgprot(PTE_MAYBE_GP),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) __pgprot(PTE_PXN));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) int set_memory_valid(unsigned long addr, int numpages, int enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return __change_memory_common(addr, PAGE_SIZE * numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) __pgprot(PTE_VALID),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) __pgprot(0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return __change_memory_common(addr, PAGE_SIZE * numpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) __pgprot(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) __pgprot(PTE_VALID));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) int set_direct_map_invalid_noflush(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct page_change_data data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .set_mask = __pgprot(0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .clear_mask = __pgprot(PTE_VALID),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (!rodata_full)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return apply_to_page_range(&init_mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) (unsigned long)page_address(page),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) PAGE_SIZE, change_page_range, &data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) int set_direct_map_default_noflush(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct page_change_data data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) .set_mask = __pgprot(PTE_VALID | PTE_WRITE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .clear_mask = __pgprot(PTE_RDONLY),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (!rodata_full)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return apply_to_page_range(&init_mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) (unsigned long)page_address(page),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) PAGE_SIZE, change_page_range, &data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) void __kernel_map_pages(struct page *page, int numpages, int enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (!debug_pagealloc_enabled() && !rodata_full)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) set_memory_valid((unsigned long)page_address(page), numpages, enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * This function is used to determine if a linear map page has been marked as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * not-valid. Walk the page table and check the PTE_VALID bit. This is based
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * on kern_addr_valid(), which almost does what we need.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * Because this is only called on the kernel linear map, p?d_sect() implies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * p?d_present(). When debug_pagealloc is enabled, sections mappings are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * disabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) bool kernel_page_present(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) pgd_t *pgdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) p4d_t *p4dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) pud_t *pudp, pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) pmd_t *pmdp, pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) pte_t *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) unsigned long addr = (unsigned long)page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (!debug_pagealloc_enabled() && !rodata_full)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) pgdp = pgd_offset_k(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (pgd_none(READ_ONCE(*pgdp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) p4dp = p4d_offset(pgdp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (p4d_none(READ_ONCE(*p4dp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) pudp = pud_offset(p4dp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) pud = READ_ONCE(*pudp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (pud_none(pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (pud_sect(pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) pmdp = pmd_offset(pudp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) pmd = READ_ONCE(*pmdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (pmd_none(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (pmd_sect(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ptep = pte_offset_kernel(pmdp, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return pte_valid(READ_ONCE(*ptep));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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