linux-kernel - Re: [linux-review:James-Hogan/kbuild-Remove-stale-asm-generic-wrappers/20160119-183642] d979f99e9cc14e2667e9b6e268db695977e4197a BUILD DONE

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Date:	Fri, 29 Jan 2016 09:01:31 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	James Hogan <james.hogan@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Heinrich Schuchardt <xypron.glpk@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Michal Marek <mmarek@...e.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [linux-review:James-Hogan/kbuild-Remove-stale-asm-generic-wrappers/20160119-183642]
 d979f99e9cc14e2667e9b6e268db695977e4197a BUILD DONE

Hi Arnd,

On Fri, Jan 29, 2016 at 12:07 AM, Arnd Bergmann <arnd@...db.de> wrote:
> The other related issue is the DEBUG_UART_{VIRT,PHYS} setting,
> where there is no safe platform-specific default. I have two
> ideas for working around that, maybe one of them sounds ok to
> you:
>
> a) find a way to warn and/or disable DEBUG_LL when no address
>    is set, rather than failing the build
>
> b) add 'default 0 if COMPILE_TEST' to make it harder to get this
>    wrong by accident (hopefully nobody tries to run a COMPILE_TEST
>    kernel). Also maybe add a #warning if DEBUG_UART_VIRT is

Make sure to add it at the end of the list, so enabling COMPILE_TEST in a
working .config should give another working .config.

Perhaps you can use 0xdeadbeef instead of 0, and add

    #if DEBUG_UART_PHYS == 0xdeadbeed
    #warning Broken value of DEBUG_UART_PHYS.
    #endif

somewhere?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds