Commit 8afa97ba authored Jan 25, 2016 by dann frazier Committed by Sasha Levin Apr 18, 2016

arm64: errata: Add -mpc-relative-literal-loads to build flags

[ Upstream commit 67dfa1751ce71e629aad7c438e1678ad41054677 ]

GCC6 (and Linaro's 2015.12 snapshot of GCC5) has a new default that uses
adrp/ldr or adrp/add to address literal pools. When CONFIG_ARM64_ERRATUM_843419
is enabled, modules built with this toolchain fail to load:

  module libahci: unsupported RELA relocation: 275

This patch fixes the problem by passing '-mpc-relative-literal-loads'
to the compiler.

Cc: stable@vger.kernel.org
Fixes: df057cc7b4fa ("arm64: errata: add module build workaround for erratum #843419")
BugLink: http://bugs.launchpad.net/bugs/1533009


Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Suggested-by: Christophe Lyon <christophe.lyon@linaro.org>
Signed-off-by: Dann Frazier <dann.frazier@canonical.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent d0706774

arch/arm64/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,8 @@ LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
		KBUILD_DEFCONFIG := defconfig

		KBUILD_CFLAGS += -mgeneral-regs-only
		KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads)

		ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
		KBUILD_CPPFLAGS += -mbig-endian
		AS += -EB