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x86-64, NUMA: Clean up initmem_init() 

This patch cleans initmem_init() so that it is more readable and doesn't
use an unnecessary array of function pointers to convolute the flow of
the code.  It also makes it obvious that dummy_numa_init() will always
succeed (and documents that requirement) so that the existing BUG() is
never actually reached.

No functional change.

-tj: Updated comment for dummy_numa_init() slightly.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
David Rientjes 2011-03-04 15:17:21 +01:00 committed by Tejun Heo
parent 51b361b400
commit c09cedf4f7
1 changed files with 57 additions and 41 deletions
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98
arch/x86/mm/numa_64.c
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@ -562,6 +562,15 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
return 0;
}
/**
* dummy_numma_init - Fallback dummy NUMA init
*
* Used if there's no underlying NUMA architecture, NUMA initialization
* fails, or NUMA is disabled on the command line.
*
* Must online at least one node and add memory blocks that cover all
* allowed memory. This function must not fail.
*/
static int __init dummy_numa_init(void)
{
printk(KERN_INFO "%s\n",
@ -575,57 +584,64 @@ static int __init dummy_numa_init(void)
return 0;
}
static int __init numa_init(int (*init_func)(void))
{
int i;
int ret;
for (i = 0; i < MAX_LOCAL_APIC; i++)
set_apicid_to_node(i, NUMA_NO_NODE);
nodes_clear(numa_nodes_parsed);
nodes_clear(node_possible_map);
nodes_clear(node_online_map);
memset(&numa_meminfo, 0, sizeof(numa_meminfo));
remove_all_active_ranges();
numa_reset_distance();
ret = init_func();
if (ret < 0)
return ret;
ret = numa_cleanup_meminfo(&numa_meminfo);
if (ret < 0)
return ret;
numa_emulation(&numa_meminfo, numa_distance_cnt);
ret = numa_register_memblks(&numa_meminfo);
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;
}
void __init initmem_init(void)
{
int (*numa_init[])(void) = { [2] = dummy_numa_init };
int i, j;
int ret;
if (!numa_off) {
#ifdef CONFIG_ACPI_NUMA
numa_init[0] = x86_acpi_numa_init;
ret = numa_init(x86_acpi_numa_init);
if (!ret)
return;
#endif
#ifdef CONFIG_AMD_NUMA
numa_init[1] = amd_numa_init;
ret = numa_init(amd_numa_init);
if (!ret)
return;
#endif
}
for (i = 0; i < ARRAY_SIZE(numa_init); i++) {
if (!numa_init[i])
continue;
for (j = 0; j < MAX_LOCAL_APIC; j++)
set_apicid_to_node(j, NUMA_NO_NODE);
nodes_clear(numa_nodes_parsed);
nodes_clear(node_possible_map);
nodes_clear(node_online_map);
memset(&numa_meminfo, 0, sizeof(numa_meminfo));
remove_all_active_ranges();
numa_reset_distance();
if (numa_init[i]() < 0)
continue;
if (numa_cleanup_meminfo(&numa_meminfo) < 0)
continue;
numa_emulation(&numa_meminfo, numa_distance_cnt);
if (numa_register_memblks(&numa_meminfo) < 0)
continue;
for (j = 0; j < nr_cpu_ids; j++) {
int nid = early_cpu_to_node(j);
if (nid == NUMA_NO_NODE)
continue;
if (!node_online(nid))
numa_clear_node(j);
}
numa_init_array();
return;
}
BUG();
numa_init(dummy_numa_init);
}
unsigned long __init numa_free_all_bootmem(void)