linux-kernel - Re: [PATCH] kbuild: introduce ccflags-remove-y and asflags-remove-y

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Message-ID: <CAK7LNATusciypBJ4dYZcyrugdi_rXEV_s=zxAehDxsX+Sd5z4g@mail.gmail.com>
Date:   Tue, 30 Jun 2020 11:08:07 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ingo Molnar <mingo@...hat.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Paul Mackerras <paulus@...ba.org>,
        Rich Felker <dalias@...c.org>,
        Russell King <linux@...linux.org.uk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] kbuild: introduce ccflags-remove-y and asflags-remove-y

On Mon, Jun 29, 2020 at 2:55 PM Michael Ellerman <mpe@...erman.id.au> wrote:
>
> Masahiro Yamada <masahiroy@...nel.org> writes:
> > CFLAGS_REMOVE_<file>.o works per object, that is, there is no
> > convenient way to filter out flags for every object in a directory.
> >
> > Add ccflags-remove-y and asflags-remove-y to make it easily.
> >
> > Use ccflags-remove-y to clean up some Makefiles.
> >
> > Suggested-by: Sami Tolvanen <samitolvanen@...gle.com>
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  arch/arm/boot/compressed/Makefile | 6 +-----
> >  arch/powerpc/xmon/Makefile        | 3 +--
> >  arch/sh/boot/compressed/Makefile  | 5 +----
> >  kernel/trace/Makefile             | 4 ++--
> >  lib/Makefile                      | 5 +----
> >  scripts/Makefile.lib              | 4 ++--
> >  6 files changed, 8 insertions(+), 19 deletions(-)
> >
> > diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
> > index 89c76ca35640..55cbcdd88ac0 100644
> > --- a/arch/powerpc/xmon/Makefile
> > +++ b/arch/powerpc/xmon/Makefile
> > @@ -7,8 +7,7 @@ UBSAN_SANITIZE := n
> >  KASAN_SANITIZE := n
> >
> >  # Disable ftrace for the entire directory
> > -ORIG_CFLAGS := $(KBUILD_CFLAGS)
> > -KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
> > +ccflags-remove-y += $(CC_FLAGS_FTRACE)
>
> This could be:
>
> ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
>
> Similar to kernel/trace/Makefile below.


I fixed it up, and applied to linux-kbuild.
Thanks.


> I don't mind though.
>
> Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)
>
> cheers
>
> > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> > index 6575bb0a0434..7492844a8b1b 100644
> > --- a/kernel/trace/Makefile
> > +++ b/kernel/trace/Makefile
> > @@ -2,9 +2,9 @@
> >
> >  # Do not instrument the tracer itself:
> >
> > +ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
> > +
> >  ifdef CONFIG_FUNCTION_TRACER
> > -ORIG_CFLAGS := $(KBUILD_CFLAGS)
> > -KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
> >
> >  # Avoid recursion due to instrumentation.
> >  KCSAN_SANITIZE := n



-- 
Best Regards
Masahiro Yamada