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    Subject[PATCH 4.14 189/222] arm64: lse: remove -fcall-used-x0 flag
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Tri Vo <trong@android.com>

    commit 2a6c7c367de82951c98a290a21156770f6f82c84 upstream.

    x0 is not callee-saved in the PCS. So there is no need to specify
    -fcall-used-x0.

    Clang doesn't currently support -fcall-used flags. This patch will help
    building the kernel with clang.

    Tested-by: Nick Desaulniers <ndesaulniers@google.com>
    Acked-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Tri Vo <trong@android.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm64/lib/Makefile | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/arm64/lib/Makefile
    +++ b/arch/arm64/lib/Makefile
    @@ -12,7 +12,7 @@ lib-y := bitops.o clear_user.o delay.o
    # when supported by the CPU. Result and argument registers are handled
    # correctly, based on the function prototype.
    lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o
    -CFLAGS_atomic_ll_sc.o := -fcall-used-x0 -ffixed-x1 -ffixed-x2 \
    +CFLAGS_atomic_ll_sc.o := -ffixed-x1 -ffixed-x2 \
    -ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6 \
    -ffixed-x7 -fcall-saved-x8 -fcall-saved-x9 \
    -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \

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