[PATCH v2 3/9] arm64: mm: avoid virt_to_page() translation for the zero page
From: Ard Biesheuvel <hidden>
Date: 2016-02-29 14:45:32
Also in:
linux-mm
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
The zero page is statically allocated, so grab its struct page pointer without using virt_to_page(), which will be restricted to the linear mapping later. Signed-off-by: Ard Biesheuvel <redacted> --- arch/arm64/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7d0a9eab1133..af80e437d075 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h@@ -57,7 +57,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val); * for zero-mapped memory areas etc.. */ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; -#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) +#define ZERO_PAGE(vaddr) pfn_to_page(__pa(empty_zero_page) >> PAGE_SHIFT) #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
--
2.5.0