linux-kernel - [PATCH v3 14/21] arm64: redefine SWAPPER_TABLE

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Message-Id: <1452518355-4606-15-git-send-email-ard.biesheuvel@linaro.org>
Date:	Mon, 11 Jan 2016 14:19:07 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org,
	kernel-hardening@...ts.openwall.com, will.deacon@....com,
	catalin.marinas@....com, mark.rutland@....com,
	leif.lindholm@...aro.org, keescook@...omium.org,
	linux-kernel@...r.kernel.org
Cc:	stuart.yoder@...escale.com, bhupesh.sharma@...escale.com,
	arnd@...db.de, marc.zyngier@....com, christoffer.dall@...aro.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH v3 14/21] arm64: redefine SWAPPER_TABLE_SHIFT for use in asm code

The current definition of SWAPPER_TABLE_SHIFT can only be used in
asm code if the configured number of translation levels defines
PUD_SHIFT and/or PMD_SHIFT natively (4KB and 16KB/64KB granule,
respectively). Otherwise, it depends on the nopmd/nopud fixup
headers, which can only be included in C code.

So redefine SWAPPER_TABLE_SHIFT in a way that is independent of the
number of configured translation levels.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 arch/arm64/include/asm/kernel-pgtable.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h
index dfe4bae463b7..b1c96a29fad7 100644
--- a/arch/arm64/include/asm/kernel-pgtable.h
+++ b/arch/arm64/include/asm/kernel-pgtable.h
@@ -57,13 +57,13 @@
 #if ARM64_SWAPPER_USES_SECTION_MAPS
 #define SWAPPER_BLOCK_SHIFT	SECTION_SHIFT
 #define SWAPPER_BLOCK_SIZE	SECTION_SIZE
-#define SWAPPER_TABLE_SHIFT	PUD_SHIFT
 #else
 #define SWAPPER_BLOCK_SHIFT	PAGE_SHIFT
 #define SWAPPER_BLOCK_SIZE	PAGE_SIZE
-#define SWAPPER_TABLE_SHIFT	PMD_SHIFT
 #endif
 
+#define SWAPPER_TABLE_SHIFT	(SWAPPER_BLOCK_SHIFT + PAGE_SHIFT - 3)
+
 /* The size of the initial kernel direct mapping */
 #define SWAPPER_INIT_MAP_SIZE	(_AC(1, UL) << SWAPPER_TABLE_SHIFT)
 
-- 
2.5.0