linux-kernel - [PATCH v4 3/7] arm64: Introduce a kernel configuration option for VA

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Message-id: <000301cf6367$ca12e150$5e38a3f0$@samsung.com>
Date:	Tue, 29 Apr 2014 13:59:23 +0900
From:	Jungseok Lee <jays.lee@...sung.com>
To:	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	Catalin.Marinas@....com, Marc Zyngier <Marc.Zyngier@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	steve.capper@...aro.org, sungjinn.chung@...sung.com,
	Arnd Bergmann <arnd@...db.de>, kgene.kim@...sung.com,
	ilho215.lee@...sung.com
Subject: [PATCH v4 3/7] arm64: Introduce a kernel configuration option for
 VA_BITS

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.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Steve Capper <steve.capper@...aro.org>
Signed-off-by: Jungseok Lee <jays.lee@...sung.com>
Reviewed-by: Sungjinn Chung <sungjinn.chung@...sung.com>
---
 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 c7f5d65..7b8d429 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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