linux-kernel - Re: [PATCH] staging: Disable lustre file system for MIPS, SH, and XTENSA

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Date:	Mon, 9 Sep 2013 21:11:25 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"David S. Miller" <davem@...emloft.net>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	driverdevel <devel@...verdev.osuosl.org>,
	Peng Tao <tao.peng@....com>, Peng Tao <bergwolf@...il.com>
Subject: Re: [PATCH] staging: Disable lustre file system for MIPS, SH, and XTENSA

On Mon, Sep 9, 2013 at 7:22 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Mon, Sep 09, 2013 at 10:08:19AM -0700, Guenter Roeck wrote:
>> On Mon, Sep 09, 2013 at 09:39:02AM -0700, Greg Kroah-Hartman wrote:
>> > On Mon, Sep 09, 2013 at 06:40:12AM -0700, Christoph Hellwig wrote:
>> > > On Sun, Sep 08, 2013 at 06:59:45PM -0700, Greg Kroah-Hartman wrote:
>> > > > Can't we just export the functions for those arches?  Surely lutre
>> > > > isn't the first/only driver that needs this?
>> > >
>> > > Lustre is.  These are core mm helpers, and lustre uses them to
>> > > reimplement another core VM function.  It then uses it to access
>> > > userspace environment variable.
>> > >
>> > > In short all this code should be nuked, and no new symbols should be
>> > > exported.
>> >
>> > Ugh, you are right, the lustre code needs to be fixed here.
>> >
>> Given that, should I send another patch marking it as BROKEN again ?
>
> Well, on those arches it's "broken", so I'll dig up your original patch
> on this thread.  It's just "normal" for staging drivers to duplicate
> core code, it needs to be fixed up before it can be merged into the
> kernel tree, so no need to do anything special.

It's not only broken on MIPS, SH, and XTENSA, but also on at least parisc
and m68k[*].

It's no longer broken on sparc64, as the missing export already got
into mainline.
In light of the above, perhaps that should be reverted?

[*] Why does m68k allmodconfig still succeed on kissb???
    It does fail for me, as m68k's copy_from_user_page() calls
    flush_icache_user_range(), which is not exported.

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
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