Commit f026380e authored by dann frazier's avatar dann frazier Committed by Luis Henriques

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

commit 67dfa175 upstream.

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.

Fixes: df057cc7 ("arm64: errata: add module build workaround for erratum #843419")
BugLink: http://bugs.launchpad.net/bugs/1533009Acked-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Suggested-by: default avatarChristophe Lyon <christophe.lyon@linaro.org>
Signed-off-by: default avatarDann Frazier <dann.frazier@canonical.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent a34d35c7
......@@ -20,6 +20,7 @@ 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
......
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