Messages in this thread | | | Date | Tue, 06 Jun 2017 16:42:02 -0400 (EDT) | Subject | Re: [PATCH v3] arch/sparc: support NR_CPUS = 4096 | From | David Miller <> |
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From: Jane Chu <jane.chu@oracle.com> Date: Tue, 6 Jun 2017 14:32:29 -0600
> Linux SPARC64 limits NR_CPUS to 4064 because init_cpu_send_mondo_info() > only allocates a single page for NR_CPUS mondo entries. Thus we cannot > use all 4096 CPUs on some SPARC platforms. > > To fix, allocate (2^order) pages where order is set according to the size > of cpu_list for possible cpus. Since cpu_list_pa and cpu_mondo_block_pa > are not used in asm code, there are no imm13 offsets from the base PA > that will break because they can only reach one page. > > Orabug: 25505750 > > Signed-off-by: Jane Chu <jane.chu@oracle.com> > > Reviewed-by: Bob Picco <bob.picco@oracle.com> > Reviewed-by: Atish Patra <atish.patra@oracle.com>
Looks a lot better, applied, thanks!
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