linux-kernel - Re: SUBDIRS= replacement

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Date:   Thu, 17 Jan 2019 17:29:21 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: SUBDIRS= replacement

Hi Christoph

On Thu, Jan 17, 2019 at 03:55:31PM +0100, Christoph Hellwig wrote:
> Hi Masahiro, hi Michal,
> 
> I just got this beatiful warning:
> 
> hch@...bon:~/work/xfs$ make -j4 SUBDIRS=fs/xfs
> Makefile:189: ================= WARNING ================
> Makefile:190: 'SUBDIRS' will be removed after Linux 5.3
> Makefile:191: Please use 'M=' or 'KBUILD_EXTMOD' instead
> Makefile:192: ==========================================
> 
> Both the replacement seem to be geared towards building externals
> modules.  But what is the replacement for just building a directory
> of the normal kernel tree?
> 
> E.g. what hit this is that I rebased an XFS series, and wanted to
> compile test just the xfs code for each step using
> 
> make -j4 SUBDIRS=fs/xfs

Try:

make -j4 fs/xfs/

This is the recommend way to do so.
Let us know if you see problem with this approach.

	Sam