linux-kernel - Re: [PATCH v3 2/2] kbuild: Don't mess with the .cache.mk when root

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Date:   Tue, 13 Mar 2018 07:16:03 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>, malat@...ian.org,
        dave.hansen@...el.com, yang.s@...baba-inc.com, linux@...ck-us.net,
        Matthias Kaehlcke <mka@...omium.org>,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Arnd Bergmann <arnd@...db.de>,
        Mark Charlebois <charlebm@...il.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 2/2] kbuild: Don't mess with the .cache.mk when root


* Douglas Anderson <dianders@...omium.org> wrote:

> +# Don't create Makefile caches if running as root since they can't be deleted
> +# easily; in the real world we might be root when doing "sudo make install"
> +ifeq ($(shell id -u),0)
> +export KBUILD_NOCACHE := 1
> +endif

Please don't do this - many prominent kernel developers build their kernels as 
root - this makes the build slower for them, and also bifurcates testing.

Thanks,

	Ingo