Messages in this thread | | | Date | Wed, 1 Oct 2003 16:56:32 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch |
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> I'm a bit confused as to what significance the faulting address has btw: > kernel code can raise prefetch faults against addresses which are less > than, and presumably greater than TASK_SIZE.
Currently it can't - hlist either prefetches to zero or to a valid address and everybody else using prefetch should also use valid addresses.
But it's conceivable that future kernels make more extensive use of prefetch.
e.g. x86-64 hit it because it has prefetch is copy_{from/to}_user /csum_copy_* and everybody can pass arbitary addresses to that.
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