linux-kernel - Re: [PATCH 3/4] ndctl: switch to tools/include/linux/{kernel, list, bitmap}.h

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Date:   Wed, 26 Jul 2017 13:29:35 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] ndctl: switch to tools/include/linux/{kernel, list,
 bitmap}.h

* Dan Williams <dan.j.williams@...el.com> wrote:

> On Tue, Jul 25, 2017 at 4:55 PM, Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> > Em Tue, Jul 25, 2017 at 03:36:26PM -0700, Dan Williams escreveu:
> >> Replace the ccan implementation of list primitives, bitmap helpers and
> >> small utility macros with the common definitions available in
> >> tool/include/linux.
> >
> > You should first add what you need in separate patches, paving the way
> > to then use it, and some stuff are already there, see below:
> 
> Ok, I'll break out those changes separately.

BTW., another general observation I have is that ndctl uses autotools - while perf 
uses its own build system, some of which is abstracted out into tools/build/ and 
reused by other tooling projects as well.

I despise autotools with a passion, it's slow, bloated, and encourages all sorts 
of bad API/ABI practices that plagues many OSS projects. I know that Linus 
explicitly did a Makefile based build system for Git for (I think) similar 
reasons.

It might be a good idea to not let autotools into the kernel tooling tree, not 
because ndctl's use of autotools is bad in any fashion (it appears to be a fairly 
straightforward use), but to generally encourage good API/ABI practices in our 
tooling space, and to encourage enhancements to the tools/build/ infrastructure.

Thanks,

	Ingo