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

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Message-ID: <CAMuHMdV=3F2meFAgTY2ndyqOexh91cqKb4BW53us4A7ncYLWhQ@mail.gmail.com>
Date:	Tue, 10 Sep 2013 18:51:32 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"David S. Miller" <davem@...emloft.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 Tue, Sep 10, 2013 at 6:44 PM, Guenter Roeck <linux@...ck-us.net> wrote:
>> I tried with 2.6.3 from crosstool, and it succeeded, too.
>>
> Do such old versions of gcc still exist ? Just kidding :)
>
>> Turns out cfs_access_process_vm() is called with write=0 only.
>> Gcc 2.6.3 optimizes away the write != 0 branch (which calls copy_to_user_page()
>> and thus flush_icache_user_range()), while gcc 4.1.2 doesn't do that.
>> Mystery solved.
>>
> Still bad. Guess it would still fail with 4.6.3 if optimization is turned off.

For the record: s/2.6.3/4.6.3/.

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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