commit 383c2799113b00a5f12c820ff0fd3dfca9e5be89
author Catalin Marinas <catalin.marinas@arm.com> Mon Jul 21 15:54:50 2014 +0100
committer Catalin Marinas <catalin.marinas@arm.com> Wed Jul 23 15:28:15 2014 +0100
tree f2f9788dcbfa62fe6160cae82e67b8d83eca5bc0
parent 7078db46215f9137801a122f87ac31c504220a94

arm64: Add support for 48-bit VA space with 64KB page configuration

This patch allows support for 3 levels of page tables with 64KB page
configuration allowing 48-bit VA space. The pgd is no longer a full
PAGE_SIZE (PTRS_PER_PGD is 64) and (swapper|idmap)_pg_dir are not fully
populated (pgd_alloc falls back to kzalloc).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Jungseok Lee <jungseoklee85@gmail.com>

arch/arm64/Kconfig

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8cdb7f36..f4615ba 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -210,6 +210,7 @@
 config ARM64_PGTABLE_LEVELS
 	int
 	default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
+	default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
 	default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
 	default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48