diff options
| author | Srikar Dronamraju <srikar@linux.vnet.ibm.com> | 2020-08-18 11:11:02 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-09-16 15:05:19 +0300 |
| commit | a874f1005ef5dfe53dfd8cda59a6600e89986ecd (patch) | |
| tree | 0975aa4875e001a264cf110c39735d3ed9e606f6 /arch/powerpc/mm/numa.c | |
| parent | 67df77845c181166d4bc324cbb0382f7e81c7631 (diff) | |
| download | linux-a874f1005ef5dfe53dfd8cda59a6600e89986ecd.tar.xz | |
powerpc/numa: Set numa_node for all possible cpus
A Powerpc system with multiple possible nodes and with CONFIG_NUMA
enabled always used to have a node 0, even if node 0 does not any cpus
or memory attached to it. As per PAPR, node affinity of a cpu is only
available once its present / online. For all cpus that are possible but
not present, cpu_to_node() would point to node 0.
To ensure a cpuless, memoryless dummy node is not online, powerpc need
to make sure all possible but not present cpu_to_node are set to a
proper node.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200818081104.57888-2-srikar@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/mm/numa.c')
| -rw-r--r-- | arch/powerpc/mm/numa.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 5ddc83ba20f4..f63e1a41402f 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -507,6 +507,11 @@ static int numa_setup_cpu(unsigned long lcpu) int fcpu = cpu_first_thread_sibling(lcpu); int nid = NUMA_NO_NODE; + if (!cpu_present(lcpu)) { + set_cpu_numa_node(lcpu, first_online_node); + return first_online_node; + } + /* * If a valid cpu-to-node mapping is already available, use it * directly instead of querying the firmware, since it represents @@ -944,8 +949,17 @@ void __init mem_topology_setup(void) reset_numa_cpu_lookup_table(); - for_each_present_cpu(cpu) + for_each_possible_cpu(cpu) { + /* + * Powerpc with CONFIG_NUMA always used to have a node 0, + * even if it was memoryless or cpuless. For all cpus that + * are possible but not present, cpu_to_node() would point + * to node 0. To remove a cpuless, memoryless dummy node, + * powerpc need to make sure all possible but not present + * cpu_to_node are set to a proper node. + */ numa_setup_cpu(cpu); + } } void __init initmem_init(void) |