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    Subject[PATCH v8 12/12] efi/libstub: disable SCS
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    Disable SCS for the EFI stub and allow x18 to be used.

    Suggested-by: James Morse <james.morse@arm.com>
    Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
    ---
    drivers/firmware/efi/libstub/Makefile | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
    index 98a81576213d..dff9fa5a3f1c 100644
    --- a/drivers/firmware/efi/libstub/Makefile
    +++ b/drivers/firmware/efi/libstub/Makefile
    @@ -30,6 +30,9 @@ KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
    $(call cc-option,-fno-stack-protector) \
    -D__DISABLE_EXPORTS

    +# remove SCS flags from all objects in this directory
    +KBUILD_CFLAGS := $(filter-out -ffixed-x18 $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
    +
    GCOV_PROFILE := n
    KASAN_SANITIZE := n
    UBSAN_SANITIZE := n
    --
    2.25.0.265.gbab2e86ba0-goog
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