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Re: oops in futex_init()

To: "Kevin D. Kissell" <kevink@paralogos.com>
Subject: Re: oops in futex_init()
From: Manuel Lauss <mano@roarinelk.homelinux.net>
Date: Thu, 30 Apr 2009 13:22:43 +0200
Cc: Ralf Baechle <ralf@linux-mips.org>, Linux-MIPS <linux-mips@linux-mips.org>
In-reply-to: <49F98826.3030708@paralogos.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20090428124645.GA14347@roarinelk.homelinux.net> <20090429060317.GB15627@linux-mips.org> <20090429082556.GA22844@roarinelk.homelinux.net> <20090429083349.GB26289@linux-mips.org> <20090429114042.GA24576@roarinelk.homelinux.net> <20090429141411.GA25905@roarinelk.homelinux.net> <20090429143523.GA10242@linux-mips.org> <20090429153221.GA26387@roarinelk.homelinux.net> <20090430104130.GA1878@roarinelk.homelinux.net> <49F98826.3030708@paralogos.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.16 (2007-06-09)
On Thu, Apr 30, 2009 at 01:14:46PM +0200, Kevin D. Kissell wrote:
> Manuel Lauss wrote:
> > Hi,
> >
> > This is really embarrassing:  The oops is what happens when you
> > ioremap(0x10) and write 0xffffffff at the resulting address (0xa0000010).
> >   
> This pretty much implies that _CACHE_UNCACHED was passed in the flags
> value to ioremap, so it simply returned the kseg1 address.  By any

uncached is default for plain ioremap(), says io.h:

#define ioremap(offset, size)                                           \
        __ioremap_mode((offset), (size), _CACHE_UNCACHED)

Apparently one can ioremap everything on mips except RAM in use at
0x8xxxxxxxx.

        Manuel Lauss

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