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powerpc: Only set numa node information for present cpus at boottime 

As Nish suggested, it makes more sense to init the numa node informatiion
for present cpus at boottime, which could also avoid WARN_ON(1) in
numa_setup_cpu().

With this change, we also need to change the smp_prepare_cpus() to set up
numa information only on present cpus.

For those possible, but not present cpus, their numa information
will be set up after they are started, as the original code did before commit
2fabf084b6.

Cc: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Acked-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Tested-by: Cyril Bur <cyril.bur@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Li Zhong 2014-08-27 17:34:00 +08:00 committed by Michael Ellerman
parent 70ad237515
commit bc3c4327c9
2 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/powerpc/kernel/smp.c
View File

@ -380,8 +380,11 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
/*
* numa_node_id() works after this.
*/
set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]);
set_cpu_numa_mem(cpu, local_memory_node(numa_cpu_lookup_table[cpu]));
if (cpu_present(cpu)) {
set_cpu_numa_node(cpu, numa_cpu_lookup_table[cpu]);
set_cpu_numa_mem(cpu,
local_memory_node(numa_cpu_lookup_table[cpu]));
}
}
cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid));
@ -729,6 +732,9 @@ void start_secondary(void *unused)
}
traverse_core_siblings(cpu, true);
set_numa_node(numa_cpu_lookup_table[cpu]);
set_numa_mem(local_memory_node(numa_cpu_lookup_table[cpu]));
smp_wmb();
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);

2
arch/powerpc/mm/numa.c
View File

@ -1127,7 +1127,7 @@ void __init do_init_bootmem(void)
* even before we online them, so that we can use cpu_to_{node,mem}
* early in boot, cf. smp_prepare_cpus().
*/
for_each_possible_cpu(cpu) {
for_each_present_cpu(cpu) {
numa_setup_cpu((unsigned long)cpu);
}
}