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    Subject[PATCH 3.16.y-ckt 030/129] arm64: errata: Add -mpc-relative-literal-loads to build flags
    Date
    3.16.7-ckt25 -stable review patch.  If anyone has any objections, please let me know.

    ---8<------------------------------------------------------------

    From: dann frazier <dann.frazier@canonical.com>

    commit 67dfa1751ce71e629aad7c438e1678ad41054677 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: 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>
    [ luis: backported to 3.16: adjusted context ]
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    arch/arm64/Makefile | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
    index e82e87e7ff6d..dac811dbe9fa 100644
    --- a/arch/arm64/Makefile
    +++ b/arch/arm64/Makefile
    @@ -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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