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    SubjectRe: [PATCH 17/22] arm64: vdso: disable LTO
    On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen <samitolvanen@google.com> wrote:
    >
    > Filter out CC_FLAGS_LTO for the vDSO.

    Just curious about this patch (and the following one for x86's vdso),
    do you happen to recall specifically what the issues with the vdso's
    are?

    >
    > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
    > ---
    > arch/arm64/kernel/vdso/Makefile | 4 ++--
    > 1 file changed, 2 insertions(+), 2 deletions(-)
    >
    > diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
    > index 556d424c6f52..cfad4c296ca1 100644
    > --- a/arch/arm64/kernel/vdso/Makefile
    > +++ b/arch/arm64/kernel/vdso/Makefile
    > @@ -29,8 +29,8 @@ 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)
    > -KBUILD_CFLAGS += $(DISABLE_LTO)
    > +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) \
    > + $(CC_FLAGS_LTO)
    > KASAN_SANITIZE := n
    > UBSAN_SANITIZE := n
    > OBJECT_FILES_NON_STANDARD := y
    > --
    > 2.27.0.212.ge8ba1cc988-goog
    >


    --
    Thanks,
    ~Nick Desaulniers

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