[PATCH 1/4] x86: Change size of node ids from u8 to s16 fixup V2

From: travis
Date: Mon Jan 21 2008 - 16:17:06 EST


Change the size of node ids for X86_64 from u8 to s16 to
accomodate more than 32k nodes and allow for NUMA_NO_NODE
(-1) to be sign extended to int.

Based on 2.6.24-rc8-mm1

Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Yinghai Lu <yhlu.kernel@xxxxxxxxx>
Cc: Eric Dumazet <dada1@xxxxxxxxxxxxx>
Signed-off-by: Mike Travis <travis@xxxxxxx>
Reviewed-by: Christoph Lameter <clameter@xxxxxxx>
---
fixup-V2:

- Fixed populate_memnodemap as suggested by Eric.
- Change to using s16 for static node id arrays and
int for node id's in per_cpu variables and __initdata
arrays as suggested by David and Yinghai.
- NUMA_NO_NODE is now (-1)

fixup:

- Size of memnode.embedded_map needs to be changed to
accomodate 16-bit node ids as suggested by Eric.

V2->V3:
- changed memnode.embedded_map from [64-16] to [64-8]
(and size comment to 128 bytes)

V1->V2:
- changed pxm_to_node_map to u16
- changed memnode map entries to u16
---
arch/x86/Kconfig | 1 +
arch/x86/mm/numa_64.c | 14 +++++++-------
include/asm-x86/mmzone_64.h | 6 +++---
include/asm-x86/numa_64.h | 2 +-
include/asm-x86/topology.h | 8 ++++----
5 files changed, 16 insertions(+), 15 deletions(-)

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -882,6 +882,7 @@ config NUMA_EMU

config NODES_SHIFT
int
+ range 1 15 if X86_64
default "6" if X86_64
default "4" if X86_NUMAQ
default "3"
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -31,16 +31,16 @@ bootmem_data_t plat_node_bdata[MAX_NUMNO

struct memnode memnode;

-u16 x86_cpu_to_node_map_init[NR_CPUS] = {
+int 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;
+DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
EXPORT_PER_CPU_SYMBOL(x86_cpu_to_node_map);

-u16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
+s16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
};

@@ -64,7 +64,7 @@ static int __init populate_memnodemap(co
unsigned long addr, end;
int i, res = -1;

- memset(memnodemap, 0xff, memnodemapsize);
+ memset(memnodemap, 0xff, sizeof(s16)*memnodemapsize);
for (i = 0; i < numnodes; i++) {
addr = nodes[i].start;
end = nodes[i].end;
@@ -73,7 +73,7 @@ static int __init populate_memnodemap(co
if ((end >> shift) >= memnodemapsize)
return 0;
do {
- if (memnodemap[addr >> shift] != 0xff)
+ if (memnodemap[addr >> shift] != NUMA_NO_NODE)
return -1;
memnodemap[addr >> shift] = i;
addr += (1UL << shift);
@@ -88,7 +88,7 @@ static int __init allocate_cachealigned_
unsigned long pad, pad_addr;

memnodemap = memnode.embedded_map;
- if (memnodemapsize <= 48)
+ if (memnodemapsize <= ARRAY_SIZE(memnode.embedded_map))
return 0;

pad = L1_CACHE_BYTES - 1;
@@ -566,7 +566,7 @@ __cpuinit void numa_add_cpu(int cpu)

void __cpuinit numa_set_node(int cpu, int node)
{
- u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
+ int *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;

cpu_pda(cpu)->nodenumber = node;

--- a/include/asm-x86/mmzone_64.h
+++ b/include/asm-x86/mmzone_64.h
@@ -15,9 +15,9 @@
struct memnode {
int shift;
unsigned int mapsize;
- u8 *map;
- u8 embedded_map[64-16];
-} ____cacheline_aligned; /* total size = 64 bytes */
+ s16 *map;
+ s16 embedded_map[64-8];
+} ____cacheline_aligned; /* total size = 128 bytes */
extern struct memnode memnode;
#define memnode_shift memnode.shift
#define memnodemap memnode.map
--- a/include/asm-x86/numa_64.h
+++ b/include/asm-x86/numa_64.h
@@ -20,7 +20,7 @@ extern void numa_set_node(int cpu, int n
extern void srat_reserve_add_area(int nodeid);
extern int hotadd_percent;

-extern u16 apicid_to_node[MAX_LOCAL_APIC];
+extern s16 apicid_to_node[MAX_LOCAL_APIC];

extern void numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn);
extern unsigned long numa_free_all_bootmem(void);
--- a/include/asm-x86/topology.h
+++ b/include/asm-x86/topology.h
@@ -30,17 +30,17 @@
#include <asm/mpspec.h>

/* Mappings between logical cpu number and node number */
-DECLARE_PER_CPU(u16, x86_cpu_to_node_map);
-extern u16 x86_cpu_to_node_map_init[];
+DECLARE_PER_CPU(int, x86_cpu_to_node_map);
+extern int x86_cpu_to_node_map_init[];
extern void *x86_cpu_to_node_map_early_ptr;
extern cpumask_t node_to_cpumask_map[];

-#define NUMA_NO_NODE ((u16)(~0))
+#define NUMA_NO_NODE (-1)

/* Returns the number of the node containing CPU 'cpu' */
static inline int cpu_to_node(int cpu)
{
- u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
+ int *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;

if (cpu_to_node_map)
return cpu_to_node_map[cpu];

--
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