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 Signed-off-by: Mike Travis --- include/linux/cpumask.h | 9 +++++++++ kernel/cpu.c | 41 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff -r --- linux-2.6.28.orig/include/linux/cpumask.h +++ linux-2.6.28/include/linux/cpumask.h @@ -604,6 +604,15 @@ 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 @@ -499,3 +498,44 @@ 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); +}