On Mon, 2013-04-15 at 13:27 +0200, Benjamin Herrenschmidt wrote: > On Mon, 2013-04-15 at 16:15 +0800, Li Zhong wrote: > > > So the code is implemented in ppc_md.hpte_remove(), may be called by > > __hash_huge_page(), and asm code htab_call_hpte_remove? > > > > > This is why the linear mapping (and the vmemmap) must be bolted. > > > > If not, it would result the infinite recursion like above? > > Potentially, we don't expect to fault linear mapping or vmemmap entries > on demand. We aren't equipped to do it and we occasionally have code > path that access the linear mapping and cannot afford to have SRR0 and > SRR1 clobbered by a page fault.
Thank you for the education :) Thanks, Zhong > > Cheers, > Ben. > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
