[RFC PATCH 5/9] powerpc/mm/book3s-64: Move _PAGE_PTE to 2nd most significant bit
From: Paul Mackerras <hidden>
Date: 2016-02-20 06:13:15
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
This changes _PAGE_PTE for 64-bit Book 3S processors from 0x1 to 0x4000_0000_0000_0000, because that bit is used as the L (leaf) bit by PowerISA v3.0 CPUs in radix mode. The "leaf" bit indicates that the PTE points to a page directly rather than another radix level, which is what the _PAGE_PTE bit means. Signed-off-by: Paul Mackerras <redacted> --- arch/powerpc/include/asm/book3s/64/hash.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 72ea557..8f077c1 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h@@ -13,7 +13,6 @@ * We could create separate kernel read-only if we used the 3 PP bits * combinations that newer processors provide but we currently don't. */ -#define _PAGE_PTE 0x00001 /* distinguishes PTEs from pointers */ #define _PAGE_BIT_SWAP_TYPE 2 #define _PAGE_USER 0x00004 /* page may be accessed by userspace */ #define _PAGE_EXEC 0x00008 /* execute permission */
@@ -38,6 +37,7 @@ #define _PAGE_SOFT_DIRTY 0x00000 #endif +#define _PAGE_PTE (1ul << 62) /* distinguishes PTEs from pointers */ #define _PAGE_PRESENT (1ul << 63) /* pte contains a translation */ /*
--
2.5.0