> -----Original Message----- > From: Kumar Gala [mailto:ga...@kernel.crashing.org] > Sent: Thursday, October 20, 2011 9:32 AM > To: Bhushan Bharat-R65777 > Cc: linuxppc-...@ozlabs.org > Subject: Re: [PATCH] powerpc/85xx: Setup secondary cores PIR with hard > SMP id > > > On Oct 19, 2011, at 10:53 PM, Bhushan Bharat-R65777 wrote: > > > > > > >> -----Original Message----- > >> From: > >> linuxppc-dev-bounces+bharat.bhushan=freescale....@lists.ozlabs.org > >> [mailto:linuxppc-dev- > >> bounces+bharat.bhushan=freescale....@lists.ozlabs.org] On Behalf Of > >> bounces+Kumar > >> Gala > >> Sent: Friday, October 14, 2011 1:23 PM > >> To: linuxppc-...@ozlabs.org > >> Subject: [PATCH] powerpc/85xx: Setup secondary cores PIR with hard > >> SMP id > >> > >> Normally logical and hard cpu ID are the same, however in same cases > >> like on the P3060 they may differ. Where the logical is 0..5, the > >> hard id goes 0,1,4..7. This can causes issues for places we utilize > >> PIR to index into array like in debug exception handlers for finding > >> the exception stack. > > > > Kumar, What should be the CONFIG_NR_CPUS for this? 8 or 6 ? > > 8.
Kumar, I am just trying to understand the impact of setting NR_CPUS = 8 while actual cpus are 6 only. If I understood correctly, cpu_present, cpu_online are logical cpuid bit map. Also the PACA is allocated for nr_cpu_ids (NR_CPUS) and also indexed by logical cpuid. While they have knowledge of physical_cpuid. So in this case last two entries of PACA will not be used or wasted? I am not sure I am missing something here? Thanks -Bharat _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
