From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
linux-mm@kvack.org
Cc: Kostya Serebryany <kcc@google.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH] kasan, arm64: clean up KASAN_SHADOW_SCALE_SHIFT usage
Date: Thu, 1 Mar 2018 18:07:12 +0100 [thread overview]
Message-ID: <44281e784702443f06edb837ec672984783a9621.1519923749.git.andreyknvl@google.com> (raw)
This is a follow up patch to the series I sent recently that cleans up
KASAN_SHADOW_SCALE_SHIFT usage (which value was hardcoded and scattered
all over the code). This fixes the one place that I forgot to fix.
The change is purely aesthetical, instead of hardcoding the value for
KASAN_SHADOW_SCALE_SHIFT in arch/arm64/Makefile, an appropriate variable
is declared and used.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
arch/arm64/Makefile | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index b481b4a7c011..4bb18aee4846 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -97,12 +97,14 @@ else
TEXT_OFFSET := 0x00080000
endif
-# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
+# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
+# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
# in 32-bit arithmetic
+KASAN_SHADOW_SCALE_SHIFT := 3
KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
- (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
- + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
- - (1 << (64 - 32 - 3)) )) )
+ (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
+ + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
+ - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
export TEXT_OFFSET GZFLAGS
--
2.16.2.395.g2e18187dfd-goog
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next reply other threads:[~2018-03-01 17:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-01 17:07 Andrey Konovalov [this message]
2018-03-05 12:16 ` Will Deacon
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