Re: [RFC BUG?] dereference PAGE_OFFSET address (rc7-mm2)

[Jeremy Fitzhardinge]

Bill Irwin wrote:
> Brain dump before crashing for the night:
>
> The patch refuses to clobber already-present pagetable entries of
> whatever origin. There are pagetables prior to this setup covering the
> address range just above PAGE_OFFSET. If this theory is correct, you
> should only be able to go a few MB above PAGE_OFFSET before encountering
> unreadable kernel memory. IIRC those pagetables are a statically
> allocated array in assembly; altering that array to set supervisor bits
> may resolve it, though it may also be freed as initmem.
>   

I think this should be fixed now.  Eric made all those writes
unconditional (to fix a problem with PSE superpages not being created). 
The patch is in Andi's queue.

    J
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