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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 23 Feb 2021 15:19:40 -0800
Message-ID: <CAHk-=wiWoqUt5z0Phvr-0HQkohi2SkYRPuCGi0xefV0KE+t4kA@mail.gmail.com>
Subject: Re: [PATCH 3/3] kbuild: Add a build check for missing gitignore entries
To:     Rob Herring <robh@kernel.org>
Cc:     Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, Feb 23, 2021 at 10:14 AM Rob Herring <robh@kernel.org> wrote:
>
> Any non-phony targets need to be in gitignore. The normal way to check
> this is doing an in-tree build and running git-status which is easy to
> miss. Git provides an easy way to check whether a file is ignored with
> git-check-ignore. Let's add a build time check using it.

This looks ridiculously expensive with a shell and git invocation for
every single target just for this check.

Considering that I just had to fight my build suddenly getting much
slower, I'm a bit sensitive about these things.

          Linus