From: Huacai Chen chenhuacai@loongson.cn
[ Upstream commit 619b52777a4972bdb6ddf86ac54c6f68a47b51c4 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/loongarch/mm/pageattr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/mm/pageattr.c b/arch/loongarch/mm/pageattr.c index bf86782484440..99165903908a4 100644 --- a/arch/loongarch/mm/pageattr.c +++ b/arch/loongarch/mm/pageattr.c @@ -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)))