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LoongArch: Fix kernel_page_present() for KPRANGE/XKPRANGE

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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: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2025-02-13 12:02:35 +08:00
parent edb1942542
commit 619b52777a
1 changed files with 2 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
arch/loongarch/mm/pageattr.c
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@ -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)))