linux-kernel - Re: Build regressions/improvements in v4.8-rc1

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Date:	Mon, 8 Aug 2016 12:22:04 -0400
From:	Rich Felker <dalias@...c.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: Build regressions/improvements in v4.8-rc1

On Mon, Aug 08, 2016 at 05:46:33PM +0200, Geert Uytterhoeven wrote:
> Hi Rich,
> 
> On Mon, Aug 8, 2016 at 4:31 PM, Rich Felker <dalias@...c.org> wrote:
> > On Mon, Aug 08, 2016 at 10:38:07AM +0200, Geert Uytterhoeven wrote:
> >> On Mon, Aug 8, 2016 at 10:32 AM, Geert Uytterhoeven
> >> <geert@...ux-m68k.org> wrote:
> >> >   + error: No rule to make target arch/sh/boot/dts/.dtb.o:  => N/A
> >>
> >> sh-allyesconfig, sh-allmodconfig
> >
> > I saw this. Is there any canonical way I should fix this? The problem
> > is that there's no default for the DTS name, but I'm not sure there
> > should be a default. Getting a hard-coded DTB for a particular board
> > when you do allyesconfig seems like a worse UX than getting a build
> > failure.
> 
> Do you have a way to pass a DTB from the bootloader, like most other
> architectures support?

Yes, and that's the intended use, but I added support for builtin DTB
for use with systems where it's hard to replace the bootloader with
one that can pass a DTB.

> If yes, can't you remove the dependency on a builtin DTB?
> Allowing to build allmodconfig/allyesconfig helps a lot for build coverage.

Users should leave builtin-DTB off, but allyesconfig turns it on.

Rich