On Thu, 2009-10-08 at 00:13 +0200, Joakim Tjernlund wrote: > Benjamin Herrenschmidt <b...@kernel.crashing.org> wrote on 07/10/2009 > 23:18:21: > > > > On Wed, 2009-10-07 at 22:46 +0200, Joakim Tjernlund wrote: > > > dcbz, dcbf, dcbi, dcbst and icbi do not set DAR when they > > > cause a DTLB Error. Dectect this by tagging DAR with 0x00f0 > > > at every exception exit that modifies DAR. > > > Test for DAR=0x00f0 in DataTLBError and bail > > > to handle_page_fault(). > > > > Why not -1 ? :-) > > Because 0x00f0 is already in use in the TLB fast path, saves one insn.
But will cause weird things if the user really uses 0xf0 (though granted that's unlikely :-) Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
