On 07/10/16 05:36, Reza Arbab wrote: > Remove the check which prevents us from hotplugging into an empty node. > > This limitation has been questioned before [1], and judging by the > response, there doesn't seem to be a reason we can't remove it. No issues > have been found in light testing. > > [1] > http://lkml.kernel.org/r/cagzkibrmksa1yyhbf5hwgxubcjse5smksmy4tpanerme2ug...@mail.gmail.com > > http://lkml.kernel.org/r/20160511215051.gf22...@arbab-laptop.austin.ibm.com > > Signed-off-by: Reza Arbab <ar...@linux.vnet.ibm.com> > Reviewed-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> > Acked-by: Balbir Singh <bsinghar...@gmail.com> > Cc: Nathan Fontenot <nf...@linux.vnet.ibm.com> > Cc: Bharata B Rao <bhar...@linux.vnet.ibm.com> > --- > arch/powerpc/mm/numa.c | 13 +------------ > 1 file changed, 1 insertion(+), 12 deletions(-) > > diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c > index 75b9cd6..d7ac419 100644 > --- a/arch/powerpc/mm/numa.c > +++ b/arch/powerpc/mm/numa.c > @@ -1121,7 +1121,7 @@ static int hot_add_node_scn_to_nid(unsigned long > scn_addr) > int hot_add_scn_to_nid(unsigned long scn_addr) > { > struct device_node *memory = NULL; > - int nid, found = 0; > + int nid; > > if (!numa_enabled || (min_common_depth < 0)) > return first_online_node; > @@ -1137,17 +1137,6 @@ int hot_add_scn_to_nid(unsigned long scn_addr) > if (nid < 0 || !node_online(nid)) > nid = first_online_node; > > - if (NODE_DATA(nid)->node_spanned_pages) > - return nid; > - > - for_each_online_node(nid) { > - if (NODE_DATA(nid)->node_spanned_pages) { > - found = 1; > - break; > - } > - } > - > - BUG_ON(!found); > return nid;
FYI, these checks were temporary to begin with I found this in git history b226e462124522f2f23153daff31c311729dfa2f (powerpc: don't add memory to empty node/zone) Balbir Singh.
