diff options
Diffstat (limited to 'include/linux/cpumask.h')
| -rw-r--r-- | include/linux/cpumask.h | 123 |
1 files changed, 89 insertions, 34 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 383684e30f12..bfc4690de4f4 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -91,44 +91,15 @@ extern struct cpumask __cpu_possible_mask; extern struct cpumask __cpu_online_mask; extern struct cpumask __cpu_present_mask; extern struct cpumask __cpu_active_mask; +extern struct cpumask __cpu_dying_mask; #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask) #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask) #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask) #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask) +#define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask) extern atomic_t __num_online_cpus; -#if NR_CPUS > 1 -/** - * num_online_cpus() - Read the number of online CPUs - * - * Despite the fact that __num_online_cpus is of type atomic_t, this - * interface gives only a momentary snapshot and is not protected against - * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held - * region. - */ -static inline unsigned int num_online_cpus(void) -{ - return atomic_read(&__num_online_cpus); -} -#define num_possible_cpus() cpumask_weight(cpu_possible_mask) -#define num_present_cpus() cpumask_weight(cpu_present_mask) -#define num_active_cpus() cpumask_weight(cpu_active_mask) -#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) -#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) -#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) -#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) -#else -#define num_online_cpus() 1U -#define num_possible_cpus() 1U -#define num_present_cpus() 1U -#define num_active_cpus() 1U -#define cpu_online(cpu) ((cpu) == 0) -#define cpu_possible(cpu) ((cpu) == 0) -#define cpu_present(cpu) ((cpu) == 0) -#define cpu_active(cpu) ((cpu) == 0) -#endif - extern cpumask_t cpus_booted_once_mask; static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits) @@ -235,7 +206,7 @@ static inline unsigned int cpumask_last(const struct cpumask *srcp) return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits); } -unsigned int cpumask_next(int n, const struct cpumask *srcp); +unsigned int __pure cpumask_next(int n, const struct cpumask *srcp); /** * cpumask_next_zero - get the next unset cpu in a cpumask @@ -252,8 +223,8 @@ static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); } -int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); -int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); +int __pure cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); +int __pure cpumask_any_but(const struct cpumask *mask, unsigned int cpu); unsigned int cpumask_local_spread(unsigned int i, int node); int cpumask_any_and_distribute(const struct cpumask *src1p, const struct cpumask *src2p); @@ -857,6 +828,14 @@ set_cpu_active(unsigned int cpu, bool active) cpumask_clear_cpu(cpu, &__cpu_active_mask); } +static inline void +set_cpu_dying(unsigned int cpu, bool dying) +{ + if (dying) + cpumask_set_cpu(cpu, &__cpu_dying_mask); + else + cpumask_clear_cpu(cpu, &__cpu_dying_mask); +} /** * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * @@ -894,6 +873,82 @@ static inline const struct cpumask *get_cpu_mask(unsigned int cpu) return to_cpumask(p); } +#if NR_CPUS > 1 +/** + * num_online_cpus() - Read the number of online CPUs + * + * Despite the fact that __num_online_cpus is of type atomic_t, this + * interface gives only a momentary snapshot and is not protected against + * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held + * region. + */ +static inline unsigned int num_online_cpus(void) +{ + return atomic_read(&__num_online_cpus); +} +#define num_possible_cpus() cpumask_weight(cpu_possible_mask) +#define num_present_cpus() cpumask_weight(cpu_present_mask) +#define num_active_cpus() cpumask_weight(cpu_active_mask) + +static inline bool cpu_online(unsigned int cpu) +{ + return cpumask_test_cpu(cpu, cpu_online_mask); +} + +static inline bool cpu_possible(unsigned int cpu) +{ + return cpumask_test_cpu(cpu, cpu_possible_mask); +} + +static inline bool cpu_present(unsigned int cpu) +{ + return cpumask_test_cpu(cpu, cpu_present_mask); +} + +static inline bool cpu_active(unsigned int cpu) +{ + return cpumask_test_cpu(cpu, cpu_active_mask); +} + +static inline bool cpu_dying(unsigned int cpu) +{ + return cpumask_test_cpu(cpu, cpu_dying_mask); +} + +#else + +#define num_online_cpus() 1U +#define num_possible_cpus() 1U +#define num_present_cpus() 1U +#define num_active_cpus() 1U + +static inline bool cpu_online(unsigned int cpu) +{ + return cpu == 0; +} + +static inline bool cpu_possible(unsigned int cpu) +{ + return cpu == 0; +} + +static inline bool cpu_present(unsigned int cpu) +{ + return cpu == 0; +} + +static inline bool cpu_active(unsigned int cpu) +{ + return cpu == 0; +} + +static inline bool cpu_dying(unsigned int cpu) +{ + return false; +} + +#endif /* NR_CPUS > 1 */ + #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) #if NR_CPUS <= BITS_PER_LONG |