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Subject[PATCH 2/5] x86: Change NR_CPUS arrays in numa_64 fixup
Change the following static arrays sized by NR_CPUS to
per_cpu data variables:

char cpu_to_node_map[NR_CPUS];


Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Christoph Lameter <clameter@sgi.com>
---
fixup:
- Split cpu_to_node function into "early" and "late" versions
so that x86_cpu_to_node_map_early_ptr is not EXPORT'ed and
the cpu_to_node inline function is more streamlined.

- This also involves setting up the percpu maps as early as possible.

- Fix X86_32 NUMA build errors that previous version of this
patch caused.

V2->V3:
- add early_cpu_to_node function to keep cpu_to_node efficient
- move and rename smp_set_apicids() to setup_percpu_maps()
- call setup_percpu_maps() as early as possible

V1->V2:
- Removed extraneous casts
- Fix !NUMA builds with '#ifdef CONFIG_NUMA"
---
arch/x86/kernel/setup64.c | 41 +++++++++++++++++++++++++++++++++++++++--
arch/x86/kernel/smpboot_32.c | 2 +-
arch/x86/kernel/smpboot_64.c | 34 ----------------------------------
arch/x86/mm/numa_64.c | 2 --
arch/x86/mm/srat_64.c | 5 +++--
include/asm-x86/topology.h | 23 +++++++++++++++++++++++
6 files changed, 66 insertions(+), 41 deletions(-)
--- a/arch/x86/kernel/setup64.c
+++ b/arch/x86/kernel/setup64.c
@@ -84,6 +84,40 @@ static int __init nonx32_setup(char *str
__setup("noexec32=", nonx32_setup);

/*
+ * Copy data used in early init routines from the initial arrays to the
+ * per cpu data areas. These arrays then become expendable and the *_ptrs
+ * are zeroed indicating that the static arrays are gone.
+ */
+void __init setup_percpu_maps(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+#ifdef CONFIG_SMP
+ if (per_cpu_offset(cpu)) {
+#endif
+ per_cpu(x86_cpu_to_apicid, cpu) =
+ x86_cpu_to_apicid_init[cpu];
+#ifdef CONFIG_NUMA
+ per_cpu(x86_cpu_to_node_map, cpu) =
+ x86_cpu_to_node_map_init[cpu];
+#endif
+#ifdef CONFIG_SMP
+ }
+ else
+ printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n",
+ cpu);
+#endif
+ }
+
+ /* indicate the early static arrays are gone */
+ x86_cpu_to_apicid_early_ptr = NULL;
+#ifdef CONFIG_NUMA
+ x86_cpu_to_node_map_early_ptr = NULL;
+#endif
+}
+
+/*
* Great future plan:
* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
* Always point %gs to its beginning
@@ -104,18 +138,21 @@ void __init setup_per_cpu_areas(void)
for_each_cpu_mask (i, cpu_possible_map) {
char *ptr;

- if (!NODE_DATA(cpu_to_node(i))) {
+ if (!NODE_DATA(early_cpu_to_node(i))) {
printk("cpu with no node %d, num_online_nodes %d\n",
i, num_online_nodes());
ptr = alloc_bootmem_pages(size);
} else {
- ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
+ ptr = alloc_bootmem_pages_node(NODE_DATA(early_cpu_to_node(i)), size);
}
if (!ptr)
panic("Cannot allocate cpu data for CPU %d\n", i);
cpu_pda(i)->data_offset = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
}
+
+ /* setup percpu data maps early */
+ setup_percpu_maps();
}

void pda_init(int cpu)
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -463,7 +463,7 @@ cpumask_t node_to_cpumask_map[MAX_NUMNOD
{ [0 ... MAX_NUMNODES-1] = CPU_MASK_NONE };
EXPORT_SYMBOL(node_to_cpumask_map);
/* which node each logical CPU is on */
-int cpu_to_node_map[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 };
+u8 cpu_to_node_map[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 };
EXPORT_SYMBOL(cpu_to_node_map);

/* set up a mapping between cpu and node. */
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -851,39 +851,6 @@ static int __init smp_sanity_check(unsig
return 0;
}

-/*
- * Copy data used in early init routines from the initial arrays to the
- * per cpu data areas. These arrays then become expendable and the
- * *_ptrs are zeroed indicating that the static arrays are gone.
- */
-void __init smp_set_apicids(void)
-{
- int cpu;
-
- for_each_possible_cpu(cpu) {
- if (per_cpu_offset(cpu)) {
- per_cpu(x86_cpu_to_apicid, cpu) =
- x86_cpu_to_apicid_init[cpu];
-#ifdef CONFIG_NUMA
- per_cpu(x86_cpu_to_node_map, cpu) =
- x86_cpu_to_node_map_init[cpu];
-#endif
- per_cpu(x86_bios_cpu_apicid, cpu) =
- x86_bios_cpu_apicid_init[cpu];
- }
- else
- printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n",
- cpu);
- }
-
- /* indicate the early static arrays are gone */
- x86_cpu_to_apicid_early_ptr = NULL;
-#ifdef CONFIG_NUMA
- x86_cpu_to_node_map_early_ptr = NULL;
-#endif
- x86_bios_cpu_apicid_early_ptr = NULL;
-}
-
static void __init smp_cpu_index_default(void)
{
int i;
@@ -906,7 +873,6 @@ void __init smp_prepare_cpus(unsigned in
smp_cpu_index_default();
current_cpu_data = boot_cpu_data;
current_thread_info()->cpu = 0; /* needed? */
- smp_set_apicids();
set_cpu_sibling_map(0);

if (smp_sanity_check(max_cpus) < 0) {
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -35,8 +35,6 @@ u16 x86_cpu_to_node_map_init[NR_CPUS] =
[0 ... NR_CPUS-1] = NUMA_NO_NODE
};
void *x86_cpu_to_node_map_early_ptr;
-EXPORT_SYMBOL(x86_cpu_to_node_map_init);
-EXPORT_SYMBOL(x86_cpu_to_node_map_early_ptr);
DEFINE_PER_CPU(u16, x86_cpu_to_node_map) = NUMA_NO_NODE;
EXPORT_PER_CPU_SYMBOL(x86_cpu_to_node_map);

--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -382,9 +382,10 @@ int __init acpi_scan_nodes(unsigned long
setup_node_bootmem(i, nodes[i].start, nodes[i].end);

for (i = 0; i < NR_CPUS; i++) {
- if (cpu_to_node(i) == NUMA_NO_NODE)
+ int node = cpu_to_node(i);
+ if (node == NUMA_NO_NODE)
continue;
- if (!node_isset(cpu_to_node(i), node_possible_map))
+ if (!node_isset(node, node_possible_map))
numa_set_node(i, NUMA_NO_NODE);
}
numa_init_array();
--- a/include/asm-x86/topology.h
+++ b/include/asm-x86/topology.h
@@ -30,16 +30,30 @@
#include <asm/mpspec.h>

/* Mappings between logical cpu number and node number */
+#ifdef CONFIG_X86_32
+extern u8 cpu_to_node_map[];
+
+#else
DECLARE_PER_CPU(u16, x86_cpu_to_node_map);
extern u16 x86_cpu_to_node_map_init[];
extern void *x86_cpu_to_node_map_early_ptr;
+#endif
+
extern cpumask_t node_to_cpumask_map[];

#define NUMA_NO_NODE ((u16)(~0))

/* Returns the number of the node containing CPU 'cpu' */
+#ifdef CONFIG_X86_32
+#define early_cpu_to_node(cpu) cpu_to_node(cpu)
static inline int cpu_to_node(int cpu)
{
+ return cpu_to_node_map[cpu];
+}
+
+#else /* CONFIG_X86_64 */
+static inline int early_cpu_to_node(int cpu)
+{
u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;

if (cpu_to_node_map)
@@ -50,6 +64,15 @@ static inline int cpu_to_node(int cpu)
return NUMA_NO_NODE;
}

+static inline int cpu_to_node(int cpu)
+{
+ if(per_cpu_offset(cpu))
+ return per_cpu(x86_cpu_to_node_map, cpu);
+ else
+ return NUMA_NO_NODE;
+}
+#endif /* CONFIG_X86_64 */
+
/*
* Returns the number of the node containing Node 'node'. This
* architecture is flat, so it is a pretty simple function!
--


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