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Subject[PATCH 01/10] x86_64: Cleanup non-smp usage of cpu maps v2
Cleanup references to the early cpu maps for the non-SMP configuration
and remove some functions called for SMP configurations only.

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git

Cc: Andi Kleen <ak@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Lameter <clameter@sgi.com>

Signed-off-by: Mike Travis <travis@sgi.com>
---
This patch was moved from the zero-based percpu variables patchset to here.
v2: rebased on linux-2.6.git + linux-2.6-x86.git
---
arch/x86/kernel/genapic_64.c | 2 ++
arch/x86/kernel/mpparse_64.c | 2 ++
arch/x86/kernel/setup.c | 28 +++++++++++-----------------
arch/x86/mm/numa_64.c | 4 +++-
include/asm-x86/smp.h | 5 +++++
include/asm-x86/topology.h | 15 +++++++++++----
6 files changed, 34 insertions(+), 22 deletions(-)
--- linux.trees.git.orig/arch/x86/kernel/genapic_64.c
+++ linux.trees.git/arch/x86/kernel/genapic_64.c
@@ -25,9 +25,11 @@
#endif

/* which logical CPU number maps to which CPU (physical APIC ID) */
+#ifdef CONFIG_SMP
u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata
= { [0 ... NR_CPUS-1] = BAD_APICID };
void *x86_cpu_to_apicid_early_ptr;
+#endif
DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);

--- linux.trees.git.orig/arch/x86/kernel/mpparse_64.c
+++ linux.trees.git/arch/x86/kernel/mpparse_64.c
@@ -69,9 +69,11 @@ unsigned disabled_cpus __cpuinitdata;
/* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;

+#ifdef CONFIG_SMP
u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata
= {[0 ... NR_CPUS - 1] = BAD_APICID };
void *x86_bios_cpu_apicid_early_ptr;
+#endif
DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);

--- linux.trees.git.orig/arch/x86/kernel/setup.c
+++ linux.trees.git/arch/x86/kernel/setup.c
@@ -10,7 +10,7 @@
#include <asm/setup.h>
#include <asm/topology.h>

-#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
+#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_SMP)
/*
* Copy data used in early init routines from the initial arrays to the
* per cpu data areas. These arrays then become expendable and the
@@ -21,22 +21,13 @@ static void __init setup_per_cpu_maps(vo
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];
- per_cpu(x86_bios_cpu_apicid, cpu) =
+ per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu];
+ per_cpu(x86_bios_cpu_apicid, cpu) =
x86_bios_cpu_apicid_init[cpu];
#ifdef CONFIG_NUMA
- per_cpu(x86_cpu_to_node_map, cpu) =
+ 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 will soon be gone */
@@ -72,17 +63,20 @@ void __init setup_per_cpu_areas(void)

/* Copy section for each CPU (we discard the original) */
size = PERCPU_ENOUGH_ROOM;
-
printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
size);
- for_each_cpu_mask(i, cpu_possible_map) {
+
+ for_each_possible_cpu(i) {
char *ptr;
#ifndef CONFIG_NEED_MULTIPLE_NODES
ptr = alloc_bootmem_pages(size);
#else
int node = early_cpu_to_node(i);
- if (!node_online(node) || !NODE_DATA(node))
+ if (!node_online(node) || !NODE_DATA(node)) {
ptr = alloc_bootmem_pages(size);
+ printk(KERN_INFO
+ "cpu %d has no node or node-local memory\n", i);
+ }
else
ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
#endif
@@ -96,7 +90,7 @@ void __init setup_per_cpu_areas(void)
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
}

- /* setup percpu data maps early */
+ /* Setup percpu data maps */
setup_per_cpu_maps();
}

--- linux.trees.git.orig/arch/x86/mm/numa_64.c
+++ linux.trees.git/arch/x86/mm/numa_64.c
@@ -31,13 +31,15 @@ bootmem_data_t plat_node_bdata[MAX_NUMNO

struct memnode memnode;

+#ifdef CONFIG_SMP
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_early_ptr);
+#endif
DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
EXPORT_PER_CPU_SYMBOL(x86_cpu_to_node_map);
-EXPORT_SYMBOL(x86_cpu_to_node_map_early_ptr);

s16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
--- linux.trees.git.orig/include/asm-x86/smp.h
+++ linux.trees.git/include/asm-x86/smp.h
@@ -11,10 +11,15 @@ extern int smp_num_siblings;
extern unsigned int num_processors;
extern cpumask_t cpu_initialized;

+#ifdef CONFIG_SMP
extern u16 x86_cpu_to_apicid_init[];
extern u16 x86_bios_cpu_apicid_init[];
extern void *x86_cpu_to_apicid_early_ptr;
extern void *x86_bios_cpu_apicid_early_ptr;
+#else
+#define x86_cpu_to_apicid_early_ptr NULL
+#define x86_bios_cpu_apicid_early_ptr NULL
+#endif

DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
DECLARE_PER_CPU(cpumask_t, cpu_core_map);
--- linux.trees.git.orig/include/asm-x86/topology.h
+++ linux.trees.git/include/asm-x86/topology.h
@@ -39,8 +39,13 @@ extern int cpu_to_node_map[];
#endif

DECLARE_PER_CPU(int, x86_cpu_to_node_map);
+
+#ifdef CONFIG_SMP
extern int x86_cpu_to_node_map_init[];
extern void *x86_cpu_to_node_map_early_ptr;
+#else
+#define x86_cpu_to_node_map_early_ptr NULL
+#endif

extern cpumask_t node_to_cpumask_map[];

@@ -55,6 +60,8 @@ static inline int cpu_to_node(int cpu)
}

#else /* CONFIG_X86_64 */
+
+#ifdef CONFIG_SMP
static inline int early_cpu_to_node(int cpu)
{
int *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
@@ -66,6 +73,9 @@ static inline int early_cpu_to_node(int
else
return NUMA_NO_NODE;
}
+#else
+#define early_cpu_to_node(cpu) cpu_to_node(cpu)
+#endif

static inline int cpu_to_node(int cpu)
{
@@ -77,10 +87,7 @@ static inline int cpu_to_node(int cpu)
return ((int *)x86_cpu_to_node_map_early_ptr)[cpu];
}
#endif
- if (per_cpu_offset(cpu))
- return per_cpu(x86_cpu_to_node_map, cpu);
- else
- return NUMA_NO_NODE;
+ return per_cpu(x86_cpu_to_node_map, cpu);
}
#endif /* CONFIG_X86_64 */

--


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