The patch titled
Subject: x86, numa: kill useless code to improve code readability
has been added to the -mm tree. Its filename is
x86-numa-kill-useless-code-to-improve-code-readability.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-numa-kill-useless-code-to-improve-code-readability.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-numa-kill-useless-code-to-improve-code-readability.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Subject: x86, numa: kill useless code to improve code readability
According to x86 boot sequence, early_cpu_to_node() always returns
NUMA_NO_NODE when called from numa_init(). So kill useless code to
improve code readability.
Related code sequence as below:
x86_cpu_to_node_map is set until step 2, so it is still the default
value (NUMA_NO_NODE) when accessed at step 1.
start_kernel()
setup_arch()
initmem_init()
x86_numa_init()
numa_init()
early_cpu_to_node()
1) return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
acpi_boot_init();
sfi_init()
x86_dtb_init()
generic_processor_info()
early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
init_cpu_to_node()
numa_set_node(cpu, node);
2) per_cpu(x86_cpu_to_node_map, cpu) = node;
rest_init()
kernel_init()
smp_init()
native_cpu_up()
start_secondary()
numa_set_node()
per_cpu(x86_cpu_to_node_map, cpu) = node;
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Cc: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/numa.c | 10 ----------
1 file changed, 10 deletions(-)
diff -puN arch/x86/mm/numa.c~x86-numa-kill-useless-code-to-improve-code-readability arch/x86/mm/numa.c
--- a/arch/x86/mm/numa.c~x86-numa-kill-useless-code-to-improve-code-readability
+++ a/arch/x86/mm/numa.c
@@ -593,8 +593,6 @@ static void __init numa_init_array(void)
rr = first_node(node_online_map);
for (i = 0; i < nr_cpu_ids; i++) {
- if (early_cpu_to_node(i) != NUMA_NO_NODE)
- continue;
numa_set_node(i, rr);
rr = next_node(rr, node_online_map);
if (rr == MAX_NUMNODES)
@@ -646,14 +644,6 @@ static int __init numa_init(int (*init_f
if (ret < 0)
return ret;
- for (i = 0; i < nr_cpu_ids; i++) {
- int nid = early_cpu_to_node(i);
-
- if (nid == NUMA_NO_NODE)
- continue;
- if (!node_online(nid))
- numa_clear_node(i);
- }
numa_init_array();
return 0;
_
Patches currently in -mm which might be from jiang.liu@xxxxxxxxxxxxxxx are
linux-next.patch
x86-numa-acpi-online-node-earlier-when-doing-cpu-hot-addition.patch
kernel-profilec-replace-cpu_to_mem-with-cpu_to_node.patch
sgi-xp-replace-cpu_to_node-with-cpu_to_mem-to-support-memoryless-node.patch
openvswitch-replace-cpu_to_node-with-cpu_to_mem-to-support-memoryless-node.patch
i40e-use-numa_mem_id-to-better-support-memoryless-node.patch
i40evf-use-numa_mem_id-to-better-support-memoryless-node.patch
x86-numa-kill-useless-code-to-improve-code-readability.patch
mm-update-_mem_id_-for-every-possible-cpu-when-memory-configuration-changes.patch
mm-x86-enable-memoryless-node-support-to-better-support-cpu-memory-hotplug.patch
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