This patch adds a kernel configuration for VA_BITS.
It helps to prevent unnecessary #ifdef statements insertions
for VA_BITS when implementing different page sizes and level of
translation tables.
Signed-off-by: Jungseok Lee <jays.lee@xxxxxxxxxxx>
Reviewed-by: Sungjinn Chung <sungjinn.chung@xxxxxxxxxxx>
---
arch/arm64/Kconfig | 8 ++++++++
arch/arm64/include/asm/memory.h | 6 +-----
2 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1a2faf9..431acbc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -186,6 +186,14 @@ config ARM64_3_LEVELS
endchoice
+config ARM64_VA_BITS
+ int "Virtual address space size"
+ range 39 39 if ARM64_4K_PAGES && ARM64_3_LEVELS
+ range 42 42 if ARM64_64K_PAGES && ARM64_2_LEVELS
+ help
+ This feature is determined by a combination of page size and
+ level of translation tables.
+
config CPU_BIG_ENDIAN
bool "Build big-endian kernel"
help
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index e94f945..f6e7480 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -41,11 +41,7 @@
* The module space lives between the addresses given by TASK_SIZE
* and PAGE_OFFSET - it must be within 128MB of the kernel text.
*/
-#ifdef CONFIG_ARM64_64K_PAGES
-#define VA_BITS (42)
-#else
-#define VA_BITS (39)
-#endif
+#define VA_BITS (CONFIG_ARM64_VA_BITS)
#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1))
#define MODULES_END (PAGE_OFFSET)
#define MODULES_VADDR (MODULES_END - SZ_64M)
--
1.7.10.4
--
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