Re: [PATCH v2 16/17] arm64: disable SCS for hypervisor code

Steven Rostedt
2019-10-25T01:43:06Z

On Fri, 25 Oct 2019 10:29:47 +0900
Masahiro Yamada <yamada.masahiro@socionext.com> wrote:

> On Fri, Oct 25, 2019 at 7:52 AM <samitolvanen@google.com> wrote:
> >
> > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
> > ---
> > arch/arm64/kvm/hyp/Makefile | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
> > index ea710f674cb6..8289ea086e5e 100644
> > --- a/arch/arm64/kvm/hyp/Makefile
> > +++ b/arch/arm64/kvm/hyp/Makefile
> > @@ -28,3 +28,6 @@ GCOV_PROFILE := n
> > KASAN_SANITIZE := n
> > UBSAN_SANITIZE := n
> > KCOV_INSTRUMENT := n
> > +
> > +ORIG_CFLAGS := $(KBUILD_CFLAGS)
> > +KBUILD_CFLAGS = $(subst $(CC_FLAGS_SCS),,$(ORIG_CFLAGS))
>
>
> $(subst ... ) is not the correct use here.
>
> It works like sed, s/$(CC_CFLAGS_SCS)//
> instead of matching by word.
>
>
>
>
> KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
>
> is more correct, and simpler.

I guess that would work too. Not sure why I never used it. I see mips
used it for their -pg flags.

-- Steve