linux-kernel - Re: [PATCH 2/4] kbuild: move "_all" target out of $(KBUILD

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Date:   Mon, 9 Oct 2017 15:02:36 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] kbuild: move "_all" target out of $(KBUILD_SRC) conditional

Hi,

On Tue, Oct 3, 2017 at 8:56 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> The first "_all" occurrence around line 120 is only visible when
> KBUILD_SRC is unset.
>
> If O=... is specified, the working directory is relocated, then the
> only second occurrence around line 193 is visible, that is not set
> to PHONY.
>
> Move the first one to an always visible place.  This clarifies "_all"
> is our default target and it is always set to PHONY.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
>  Makefile | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

I'm a professed non-expert on the kernel build so take my review FWIW...

I'd definitely agree that it looks like it was a bug (though not a
huge one) that it was possible for "_all" not to get marked PHONY.
Other than that this change just makes things a little more readable
since (if I followed all the Makefile code properly) prior to your
change "_all" always ended up being the default rule, just in a very
roundabout way.

Reviewed-by: Douglas Anderson <dianders@...omium.org>