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

[Bill Irwin]

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.

On Wed, May 02, 2007 at 09:28:46AM -0700, Jeremy Fitzhardinge wrote:
> 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.

It needs verification with the testcase from this thread.


-- wli
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