Commit 619b5277 authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Fix kernel_page_present() for KPRANGE/XKPRANGE 



Now kernel_page_present() always return true for KPRANGE/XKPRANGE
addresses, this isn't correct because hibernation (ACPI S4) use it
to distinguish whether a page is saveable. If all KPRANGE/XKPRANGE
addresses are considered as saveable, then reserved memory such as
EFI_RUNTIME_SERVICES_CODE / EFI_RUNTIME_SERVICES_DATA will also be
saved and restored.

Fix this by returning true only if the KPRANGE/XKPRANGE address is in
memblock.memory.

Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent edb19425

arch/loongarch/mm/pageattr.c

+2 −1
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 * Copyright (C) 2024 Loongson Technology Corporation Limited

 */



#include <linux/memblock.h>

#include <linux/pagewalk.h>

#include <linux/pgtable.h>

#include <asm/set_memory.h>
@@ -167,7 +168,7 @@ bool kernel_page_present(struct page *page) 
	unsigned long addr = (unsigned long)page_address(page);



	if (addr < vm_map_base)

		return true;

		return memblock_is_memory(__pa(addr));



	pgd = pgd_offset_k(addr);

	if (pgd_none(pgdp_get(pgd)))