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Subject[PATCH 15/16] x86: Unify node_to_cpumask_map handling between 32 and 64bit
Date
x86_32 has been managing node_to_cpumask_map explicitly from
map_cpu_to_node() and friends in a rather ugly way. With previous
changes, it's now possible to share the code with 64bit.

* When CONFIG_NUMA_EMU is disabled, numa_add/remove_cpu() are
implemented in numa.c and shared by 32 and 64bit. CONFIG_NUMA_EMU
versions still live in numa_64.c.

NUMA_EMU's dependency on 64bit is planned to be removed and the
above should go away together.

* identify_cpu() now calls numa_add_cpu() for 32bit too. This makes
the explicit mask management from map_cpu_to_node() unnecessary.

* The whole x86_32 specific map_cpu_to_node() chunk is no longer
necessary. Dropped.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
---
arch/x86/include/asm/numa.h | 9 +++++
arch/x86/include/asm/numa_32.h | 1 -
arch/x86/include/asm/numa_64.h | 4 --
arch/x86/kernel/cpu/common.c | 2 +-
arch/x86/kernel/smpboot.c | 47 -------------------------
arch/x86/mm/numa.c | 64 +++++++++++++++++++++++++++++++++-
arch/x86/mm/numa_64.c | 75 ++++++++--------------------------------
7 files changed, 87 insertions(+), 115 deletions(-)
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 2b21fff..d3964b2 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -1,6 +1,7 @@
#ifndef _ASM_X86_NUMA_H
#define _ASM_X86_NUMA_H

+#include <asm/topology.h>
#include <asm/apicdef.h>

#ifdef CONFIG_NUMA
@@ -33,9 +34,17 @@ static inline void set_apicid_to_node(int apicid, s16 node)
#ifdef CONFIG_NUMA
extern void __cpuinit numa_set_node(int cpu, int node);
extern void __cpuinit numa_clear_node(int cpu);
+extern void __cpuinit numa_add_cpu(int cpu);
+extern void __cpuinit numa_remove_cpu(int cpu);
#else /* CONFIG_NUMA */
static inline void numa_set_node(int cpu, int node) { }
static inline void numa_clear_node(int cpu) { }
+static inline void numa_add_cpu(int cpu) { }
+static inline void numa_remove_cpu(int cpu) { }
#endif /* CONFIG_NUMA */

+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+struct cpumask __cpuinit *debug_cpumask_set_cpu(int cpu, int enable);
+#endif
+
#endif /* _ASM_X86_NUMA_H */
diff --git a/arch/x86/include/asm/numa_32.h b/arch/x86/include/asm/numa_32.h
index cdf8043..bc66031 100644
--- a/arch/x86/include/asm/numa_32.h
+++ b/arch/x86/include/asm/numa_32.h
@@ -4,7 +4,6 @@
extern int numa_off;

extern int pxm_to_nid(int pxm);
-extern void numa_remove_cpu(int cpu);

#ifdef CONFIG_NUMA
extern int __cpuinit numa_cpu_node(int apicid);
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index 6ead9f3..123f185 100644
--- a/arch/x86/include/asm/numa_64.h
+++ b/arch/x86/include/asm/numa_64.h
@@ -30,8 +30,6 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,

extern void __init init_cpu_to_node(void);
extern int __cpuinit numa_cpu_node(int cpu);
-extern void __cpuinit numa_add_cpu(int cpu);
-extern void __cpuinit numa_remove_cpu(int cpu);

#ifdef CONFIG_NUMA_EMU
#define FAKE_NODE_MIN_SIZE ((u64)32 << 20)
@@ -41,8 +39,6 @@ void numa_emu_cmdline(char *);
#else
static inline void init_cpu_to_node(void) { }
static inline int numa_cpu_node(int cpu) { return NUMA_NO_NODE; }
-static inline void numa_add_cpu(int cpu, int node) { }
-static inline void numa_remove_cpu(int cpu) { }
#endif

#endif /* _ASM_X86_NUMA_64_H */
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 1d59834..a2559c3 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -869,7 +869,7 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)

select_idle_routine(c);

-#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
+#ifdef CONFIG_NUMA
numa_add_cpu(smp_processor_id());
#endif
}
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 5a6b3da..b2e209c 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -132,49 +132,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_info);

atomic_t init_deasserted;

-#if defined(CONFIG_NUMA) && defined(CONFIG_X86_32)
-/* set up a mapping between cpu and node. */
-static void map_cpu_to_node(int cpu, int node)
-{
- printk(KERN_INFO "Mapping cpu %d to node %d\n", cpu, node);
- cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
-}
-
-/* undo a mapping between cpu and node. */
-static void unmap_cpu_to_node(int cpu)
-{
- int node;
-
- printk(KERN_INFO "Unmapping cpu %d from all nodes\n", cpu);
- for (node = 0; node < MAX_NUMNODES; node++)
- cpumask_clear_cpu(cpu, node_to_cpumask_map[node]);
-}
-#else /* !(CONFIG_NUMA && CONFIG_X86_32) */
-#define map_cpu_to_node(cpu, node) ({})
-#define unmap_cpu_to_node(cpu) ({})
-#endif
-
-#ifdef CONFIG_X86_32
-static void map_cpu_to_logical_apicid(void)
-{
- int cpu = smp_processor_id();
- int node;
-
- node = numa_cpu_node(cpu);
- if (!node_online(node))
- node = first_online_node;
-
- map_cpu_to_node(cpu, node);
-}
-
-void numa_remove_cpu(int cpu)
-{
- unmap_cpu_to_node(cpu);
-}
-#else
-#define map_cpu_to_logical_apicid() do {} while (0)
-#endif
-
/*
* Report back to the Boot Processor.
* Running on AP.
@@ -242,7 +199,6 @@ static void __cpuinit smp_callin(void)
apic->smp_callin_clear_local_apic();
setup_local_APIC();
end_local_APIC_setup();
- map_cpu_to_logical_apicid();

/*
* Need to setup vector mappings before we enable interrupts.
@@ -943,7 +899,6 @@ static __init void disable_smp(void)
physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
else
physid_set_mask_of_physid(0, &phys_cpu_present_map);
- map_cpu_to_logical_apicid();
cpumask_set_cpu(0, cpu_sibling_mask(0));
cpumask_set_cpu(0, cpu_core_mask(0));
}
@@ -1120,8 +1075,6 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)

end_local_APIC_setup();

- map_cpu_to_logical_apicid();
-
if (apic->setup_portio_remap)
apic->setup_portio_remap();

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 187810b..75abecb 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -99,7 +99,21 @@ void __init setup_node_to_cpumask_map(void)
pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
}

-#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+#ifndef CONFIG_DEBUG_PER_CPU_MAPS
+
+# ifndef CONFIG_NUMA_EMU
+void __cpuinit numa_add_cpu(int cpu)
+{
+ cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
+}
+
+void __cpuinit numa_remove_cpu(int cpu)
+{
+ cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
+}
+# endif /* !CONFIG_NUMA_EMU */
+
+#else /* !CONFIG_DEBUG_PER_CPU_MAPS */

int __cpu_to_node(int cpu)
{
@@ -131,6 +145,52 @@ int early_cpu_to_node(int cpu)
return per_cpu(x86_cpu_to_node_map, cpu);
}

+struct cpumask __cpuinit *debug_cpumask_set_cpu(int cpu, int enable)
+{
+ int node = early_cpu_to_node(cpu);
+ struct cpumask *mask;
+ char buf[64];
+
+ mask = node_to_cpumask_map[node];
+ if (!mask) {
+ pr_err("node_to_cpumask_map[%i] NULL\n", node);
+ dump_stack();
+ return NULL;
+ }
+
+ cpulist_scnprintf(buf, sizeof(buf), mask);
+ printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
+ enable ? "numa_add_cpu" : "numa_remove_cpu",
+ cpu, node, buf);
+ return mask;
+}
+
+# ifndef CONFIG_NUMA_EMU
+static void __cpuinit numa_set_cpumask(int cpu, int enable)
+{
+ struct cpumask *mask;
+
+ mask = debug_cpumask_set_cpu(cpu, enable);
+ if (!mask)
+ return;
+
+ if (enable)
+ cpumask_set_cpu(cpu, mask);
+ else
+ cpumask_clear_cpu(cpu, mask);
+}
+
+void __cpuinit numa_add_cpu(int cpu)
+{
+ numa_set_cpumask(cpu, 1);
+}
+
+void __cpuinit numa_remove_cpu(int cpu)
+{
+ numa_set_cpumask(cpu, 0);
+}
+# endif /* !CONFIG_NUMA_EMU */
+
/*
* Returns a pointer to the bitmask of CPUs on Node 'node'.
*/
@@ -154,4 +214,4 @@ const struct cpumask *cpumask_of_node(int node)
}
EXPORT_SYMBOL(cpumask_of_node);

-#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
+#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index f545940..14664f5 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -726,19 +726,18 @@ int __cpuinit numa_cpu_node(int cpu)
return NUMA_NO_NODE;
}

-#ifndef CONFIG_DEBUG_PER_CPU_MAPS
-
-#ifndef CONFIG_NUMA_EMU
-void __cpuinit numa_add_cpu(int cpu)
-{
- cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
-}
-
-void __cpuinit numa_remove_cpu(int cpu)
-{
- cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
-}
-#else
+/*
+ * UGLINESS AHEAD: Currently, CONFIG_NUMA_EMU is 64bit only and makes use
+ * of 64bit specific data structures. The distinction is artificial and
+ * should be removed. numa_{add|remove}_cpu() are implemented in numa.c
+ * for both 32 and 64bit when CONFIG_NUMA_EMU is disabled but here when
+ * enabled.
+ *
+ * NUMA emulation is planned to be made generic and the following and other
+ * related code should be moved to numa.c.
+ */
+#ifdef CONFIG_NUMA_EMU
+# ifndef CONFIG_DEBUG_PER_CPU_MAPS
void __cpuinit numa_add_cpu(int cpu)
{
unsigned long addr;
@@ -778,47 +777,7 @@ void __cpuinit numa_remove_cpu(int cpu)
for_each_online_node(i)
cpumask_clear_cpu(cpu, node_to_cpumask_map[i]);
}
-#endif /* !CONFIG_NUMA_EMU */
-
-#else /* CONFIG_DEBUG_PER_CPU_MAPS */
-static struct cpumask __cpuinit *debug_cpumask_set_cpu(int cpu, int enable)
-{
- int node = early_cpu_to_node(cpu);
- struct cpumask *mask;
- char buf[64];
-
- mask = node_to_cpumask_map[node];
- if (!mask) {
- pr_err("node_to_cpumask_map[%i] NULL\n", node);
- dump_stack();
- return NULL;
- }
-
- cpulist_scnprintf(buf, sizeof(buf), mask);
- printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
- enable ? "numa_add_cpu" : "numa_remove_cpu",
- cpu, node, buf);
- return mask;
-}
-
-/*
- * --------- debug versions of the numa functions ---------
- */
-#ifndef CONFIG_NUMA_EMU
-static void __cpuinit numa_set_cpumask(int cpu, int enable)
-{
- struct cpumask *mask;
-
- mask = debug_cpumask_set_cpu(cpu, enable);
- if (!mask)
- return;
-
- if (enable)
- cpumask_set_cpu(cpu, mask);
- else
- cpumask_clear_cpu(cpu, mask);
-}
-#else
+# else /* !CONFIG_DEBUG_PER_CPU_MAPS */
static void __cpuinit numa_set_cpumask(int cpu, int enable)
{
int node = early_cpu_to_node(cpu);
@@ -842,7 +801,6 @@ static void __cpuinit numa_set_cpumask(int cpu, int enable)
cpumask_clear_cpu(cpu, mask);
}
}
-#endif /* CONFIG_NUMA_EMU */

void __cpuinit numa_add_cpu(int cpu)
{
@@ -853,8 +811,5 @@ void __cpuinit numa_remove_cpu(int cpu)
{
numa_set_cpumask(cpu, 0);
}
-/*
- * --------- end of debug versions of the numa functions ---------
- */
-
-#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
+# endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
+#endif /* CONFIG_NUMA_EMU */
--
1.7.1


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