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    Subject[PATCH v7 14/17] arm64: vdso: disable LTO
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    Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no
    point in using link-time optimization for the small about of C code.

    Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
    Reviewed-by: Kees Cook <keescook@chromium.org>
    ---
    arch/arm64/kernel/vdso/Makefile | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
    index d65f52264aba..50fe49fb4d95 100644
    --- a/arch/arm64/kernel/vdso/Makefile
    +++ b/arch/arm64/kernel/vdso/Makefile
    @@ -30,7 +30,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
    ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
    ccflags-y += -DDISABLE_BRANCH_PROFILING

    -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS)
    +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \
    + $(CC_FLAGS_LTO)
    KASAN_SANITIZE := n
    UBSAN_SANITIZE := n
    OBJECT_FILES_NON_STANDARD := y
    --
    2.29.2.299.gdc1121823c-goog
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