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authorWei Yang <richard.weiyang@gmail.com>2017-03-14 06:08:01 +0300
committerThomas Gleixner <tglx@linutronix.de>2017-04-03 12:54:37 +0300
commit474aeffd88b87746a75583f356183d5c6caa4213 (patch)
tree9b1b66516861433610d8da6f17060e254d12bd69 /arch
parent43dac8f6a74c9811454f4efbe52b48f7a802c277 (diff)
downloadlinux-474aeffd88b87746a75583f356183d5c6caa4213.tar.xz
x86/mm/numa: Remove numa_nodemask_from_meminfo()
numa_nodemask_from_meminfo() generates a nodemask of nodes which have memory according to a meminfo descriptor. The two callsites of that function both set bits in copies of the numa_nodes_parsed nodemask. In both cases, the information in supplied numa_meminfo is a subset of numa_nodes_parsed. So setting those bits again is not really necessary. Here are the three call paths which show that the supplied numa_meminfo argument describes memory regions in nodes which are already in numa_nodes_parsed: x86_numa_init() numa_init() Case 1: acpi_numa_init() acpi_parse_memory_affinity() numa_add_memblk() node_set(numa_nodes_parsed) acpi_parse_slit() acpi_numa_slit_init() numa_set_distance() numa_alloc_distance() numa_nodemask_from_meminfo() Case 2: amd_numa_init() numa_add_memblk() node_set(numa_nodes_parsed) Case 3 dummy_numa_init() node_set(numa_nodes_parsed) numa_add_memblk() numa_register_memblks() numa_nodemask_from_meminfo() Thus, in all three cases, the respective bit in numa_nodes_parsed is set, which means it is not necessary to set it again in a copy of numa_nodes_parsed. So remove that function. Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Cc: x86-ml <x86@kernel.org> Link: http://lkml.kernel.org/r/20170314030801.13656-2-richard.weiyang@gmail.com [ Heavily massage commit message. ] Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/numa.c21
1 files changed, 1 insertions, 20 deletions
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 93671d8b3b0d..175f54ac6772 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -314,20 +314,6 @@ int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
return 0;
}
-/*
- * Set nodes, which have memory in @mi, in *@nodemask.
- */
-static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
- const struct numa_meminfo *mi)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
- if (mi->blk[i].start != mi->blk[i].end &&
- mi->blk[i].nid != NUMA_NO_NODE)
- node_set(mi->blk[i].nid, *nodemask);
-}
-
/**
* numa_reset_distance - Reset NUMA distance table
*
@@ -347,16 +333,12 @@ void __init numa_reset_distance(void)
static int __init numa_alloc_distance(void)
{
- nodemask_t nodes_parsed;
size_t size;
int i, j, cnt = 0;
u64 phys;
/* size the new table and allocate it */
- nodes_parsed = numa_nodes_parsed;
- numa_nodemask_from_meminfo(&nodes_parsed, &numa_meminfo);
-
- for_each_node_mask(i, nodes_parsed)
+ for_each_node_mask(i, numa_nodes_parsed)
cnt = i;
cnt++;
size = cnt * cnt * sizeof(numa_distance[0]);
@@ -535,7 +517,6 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
/* Account for nodes with cpus and no memory */
node_possible_map = numa_nodes_parsed;
- numa_nodemask_from_meminfo(&node_possible_map, mi);
if (WARN_ON(nodes_empty(node_possible_map)))
return -EINVAL;