Messages in this thread | | | Date | Mon, 27 Oct 2003 10:52:59 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH 2.4.23-pre8] Remove broken prefetching in free_one_pgd() |
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Hi!
> > > This code will prefetch from beyond the end of the page table > > > being cleared ... which is clearly a bad thing if the page table > > > in question is allocated from the last page of memory (or precedes > > > a hole on a discontig mem system). > > Prefetching random addresses should be safe... > > It isn't on some CPUs. Early athlons go bang when you prefetch > past the end of RAM into unmapped memory for eg.
Well, broken HW :-(, but andi's patch should fix up for that.
Pavel
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