On Thu, 2017-04-13 at 14:12 +1000, Benjamin Herrenschmidt wrote: > On Thu, 2017-04-13 at 09:28 +0530, Aneesh Kumar K.V wrote: > > > #endif > > > mtctr r12 > > > bctrl > > > +/* > > > + * cur_cpu_spec->cpu_restore would restore LPCR to a > > > + * sane value that is set at early boot time, > > > + * thereby clearing LPCR_UPRT. > > > + * LPCR_UPRT is required if we are running in Radix mode. > > > + * Set it here if that be the case. > > > + */ > > > +BEGIN_MMU_FTR_SECTION > > > + mfspr r3, SPRN_LPCR > > > + LOAD_REG_IMMEDIATE(r4, LPCR_UPRT) > > > + or r3, r3, r4 > > > + mtspr SPRN_LPCR, r3 > > > +END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX) > > We are probably better off saving the value somewhere during boot > and just "blasting" it whole back.
We seem to touch LPCR in a bunch of places these days. Not sure when "sometimes during boot" should actually be. Mikey