arm64: KASAN depends on !(ARM64_16K_PAGES && ARM64_VA_BITS_48)

On KASAN + 16K_PAGES + 48BIT_VA
 arch/arm64/mm/kasan_init.c: In function ‘kasan_early_init’:
 include/linux/compiler.h:484:38: error: call to ‘__compiletime_assert_95’ declared with attribute error: BUILD_BUG_ON failed: !IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE)
    _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)

Currently KASAN will not work on 16K_PAGES and 48BIT_VA, so
forbid such configuration to avoid above build failure.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: Suzuki K. Poulose <Suzuki.Poulose@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 9ac16a4..bf7de69 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -49,7 +49,7 @@ config ARM64
        select HAVE_ARCH_AUDITSYSCALL
        select HAVE_ARCH_BITREVERSE
        select HAVE_ARCH_JUMP_LABEL
-       select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP
+       select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP && !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
        select HAVE_ARCH_KGDB
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_TRACEHOOK