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    Subject[PATCH 4.14 069/105] powerpc: avoid -mno-sched-epilog on GCC 4.9 and newer
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

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

    From: Nicholas Piggin <npiggin@gmail.com>

    commit 6977f95e63b9b3fb4a5973481a800dd9f48a1338 upstream.

    Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
    Reviewed-by: Joel Stanley <joel@jms.id.au>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    [nc: Adjust context due to lack of f2910f0e6835 and 2a056f58fd33]
    Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/powerpc/Makefile | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    --- a/arch/powerpc/Makefile
    +++ b/arch/powerpc/Makefile
    @@ -236,7 +236,12 @@ endif

    # Work around a gcc code-gen bug with -fno-omit-frame-pointer.
    ifeq ($(CONFIG_FUNCTION_TRACER),y)
    -KBUILD_CFLAGS += -mno-sched-epilog
    +# Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
    +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
    +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
    +ifneq ($(cc-name),clang)
    +KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
    +endif
    endif

    cpu-as-$(CONFIG_4xx) += -Wa,-m405

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