Re: oops in futex_init()

[Manuel Lauss <mano@roarinelk.homelinux.net>]

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