Messages in this thread | | | Date | Tue, 25 May 2004 10:25:47 -0700 | From | "David S. Miller" <> | Subject | Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE |
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On Tue, 25 May 2004 09:19:52 -0700 (PDT) Linus Torvalds <torvalds@osdl.org> wrote:
> On Tue, 25 May 2004, Keith M Wesolowski wrote: > > > > Some sparc32 CPUs are also vulnerable to this race; in fact the > > supersparc manual describes it specifically and even outlines the > > compare-exchange loop using our rotten swap instruction. In our case, > > the race is with a hardware walker. > > Yes, but the sparc32 page tables are not the same as the linux kernel page > tables, so in your case it's a different path and a different page table. > Only the shared case really matters (ie things that do hw/microcode walk > of a page table _tree_ not a hash).
Not true on 32-bit Sparc sun4m systems, it's exactly like i386 except the hardware is stupid and we only have an atomic swap instruction. :-) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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