This is for 3.17 stable.
According to Nish:
"I think they occur every boot, unconditionally, on pseries. Doesn't
prevent boot, just really noisy. I think it'd be good to get them into
-stable."
>From bc3c4327c92b9ceb9a6356ec64d1b2ab2dc851f9 Mon Sep 17 00:00:00 2001
From: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Date: Wed, 27 Aug 2014 17:34:00 +0800
Subject: [PATCH 2/2] 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
2fabf084b6ad.
Cc: Nishanth Aravamudan <nacc@xxxxxxxxxxxxxxxxxx>
Cc: Nathan Fontenot <nfont@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Acked-by: Nishanth Aravamudan <nacc@xxxxxxxxxxxxxxxxxx>
Tested-by: Cyril Bur <cyril.bur@xxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
---
arch/powerpc/kernel/smp.c | 10 ++++++++--
arch/powerpc/mm/numa.c | 2 +-
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 4866d5d..71e186d 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -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);
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 9918c02..3a9061e 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -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);
}
}
--
1.9.1
--
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