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Subject[PATCH 27/35] cpumask: accessors to manipulate possible/present/online/active maps From: Rusty Russell <>
Since we are moving to const cpumask pointers for the maps, we need a
way to legitimately access them. Simple accessors work well.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
---
include/linux/cpumask.h | 9 +++++++++
kernel/cpu.c | 41 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)

--- linux-2.6.28.orig/include/linux/cpumask.h
+++ linux-2.6.28/include/linux/cpumask.h
@@ -586,6 +586,15 @@ extern cpumask_t cpu_active_map;
#define cpu_active(cpu) ((cpu) == 0)
#endif

+/* Wrappers to manipulate otherwise-constant masks. */
+void set_cpu_possible(unsigned int cpu, bool possible);
+void set_cpu_present(unsigned int cpu, bool present);
+void set_cpu_online(unsigned int cpu, bool online);
+void set_cpu_active(unsigned int cpu, bool active);
+void init_cpu_present(const struct cpumask *src);
+void init_cpu_possible(const struct cpumask *src);
+void init_cpu_online(const struct cpumask *src);
+
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))

#define for_each_possible_cpu(cpu) for_each_cpu((cpu), &cpu_possible_map)
--- linux-2.6.28.orig/kernel/cpu.c
+++ linux-2.6.28/kernel/cpu.c
@@ -500,3 +500,44 @@ const unsigned long cpu_bit_bitmap[BITS_
#endif
};
EXPORT_SYMBOL_GPL(cpu_bit_bitmap);
+
+void set_cpu_possible(unsigned int cpu, bool possible)
+{
+ if (possible)
+ cpumask_set_cpu(cpu, &cpu_possible_map);
+ else
+ cpumask_clear_cpu(cpu, &cpu_possible_map);
+}
+void set_cpu_present(unsigned int cpu, bool present)
+{
+ if (present)
+ cpumask_set_cpu(cpu, &cpu_present_map);
+ else
+ cpumask_clear_cpu(cpu, &cpu_present_map);
+}
+void set_cpu_online(unsigned int cpu, bool online)
+{
+ if (online)
+ cpumask_set_cpu(cpu, &cpu_online_map);
+ else
+ cpumask_clear_cpu(cpu, &cpu_online_map);
+}
+void set_cpu_active(unsigned int cpu, bool active)
+{
+ if (active)
+ cpumask_set_cpu(cpu, &cpu_active_map);
+ else
+ cpumask_clear_cpu(cpu, &cpu_active_map);
+}
+void init_cpu_present(const struct cpumask *src)
+{
+ cpumask_copy(&cpu_present_map, src);
+}
+void init_cpu_possible(const struct cpumask *src)
+{
+ cpumask_copy(&cpu_possible_map, src);
+}
+void init_cpu_online(const struct cpumask *src)
+{
+ cpumask_copy(&cpu_online_map, src);
+}
--


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