Messages in this thread |  | | Date | Thu, 11 Jan 2001 00:56:57 +0100 | From | David Weinehall <> | Subject | Re: Subtle MM bug |
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On Wed, Jan 10, 2001 at 07:36:43PM +0000, Alan Cox wrote: > > I looked at it a year or two ago myself, and came to the conclusion that I > > don't want to blow up our page table size by a factor of three or more, so > > I'm not personally interested any more. Maybe somebody else comes up with > > a better way to do it, or with a really compelling reason to. > > There is only one reason I know for reverse page tables. That is ARM2/ARM3 > support - which is still not fully merged because of this issue > > The MMU on these systems is a CAM, and the mmu table is thus backwards to > convention. (It also means you can notionally map two physical addresses to > one virtual but thats undefined in the implementation ;))
Are there any other (not yet supported) platforms with similar (or other unrelated, but hard to support because of the current architecture of the kernel) problems?
(No, I have no secret trumps up my sleeve, I'm just curious.)
/David _ _ // David Weinehall <tao@acc.umu.se> /> Northern lights wander \\ // Project MCA Linux hacker // Dance across the winter sky // \> http://www.acc.umu.se/~tao/ </ Full colour fire </ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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