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authorWill Deacon <will.deacon@arm.com>2015-03-17 12:15:02 +0000
committerWill Deacon <will.deacon@arm.com>2015-09-17 11:57:03 +0100
commitdf057cc7b4fa59e9b55f07ffdb6c62bf02e99a00 (patch)
tree866dd49a0acc98317cc3866738f3b417f44eccf2 /arch/arm64/Makefile
parentbdec97a855ef1e239f130f7a11584721c9a1bf04 (diff)
downloadlinux-df057cc7b4fa59e9b55f07ffdb6c62bf02e99a00.tar.gz
arm64: errata: add module build workaround for erratum #843419
Cortex-A53 processors <= r0p4 are affected by erratum #843419 which can lead to a memory access using an incorrect address in certain sequences headed by an ADRP instruction. There is a linker fix to generate veneers for ADRP instructions, but this doesn't work for kernel modules which are built as unlinked ELF objects. This patch adds a new config option for the erratum which, when enabled, builds kernel modules with the mcmodel=large flag. This uses absolute addressing for all kernel symbols, thereby removing the use of ADRP as a PC-relative form of addressing. The ADRP relocs are removed from the module loader so that we fail to load any potentially affected modules. Cc: <stable@vger.kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Makefile')
-rw-r--r--arch/arm64/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 15ff5b4156fd..f9914d7c1bb0 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -41,6 +41,10 @@ endif
CHECKFLAGS += -D__aarch64__
+ifeq ($(CONFIG_ARM64_ERRATUM_843419), y)
+CFLAGS_MODULE += -mcmodel=large
+endif
+
# Default value
head-y := arch/arm64/kernel/head.o