diff options
Diffstat (limited to 'include/linux/cpumask.h')
| -rw-r--r-- | include/linux/cpumask.h | 134 |
1 files changed, 98 insertions, 36 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index f9a868384083..ff8f41ab7ce6 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -179,6 +179,19 @@ unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask } /** + * cpumask_first_andnot - return the first cpu from *srcp1 & ~*srcp2 + * @srcp1: the first input + * @srcp2: the second input + * + * Return: >= nr_cpu_ids if no such cpu found. + */ +static __always_inline +unsigned int cpumask_first_andnot(const struct cpumask *srcp1, const struct cpumask *srcp2) +{ + return find_first_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); +} + +/** * cpumask_first_and_and - return the first cpu from *srcp1 & *srcp2 & *srcp3 * @srcp1: the first input * @srcp2: the second input @@ -285,6 +298,25 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p, } /** + * cpumask_next_andnot - get the next cpu in *src1p & ~*src2p + * @n: the cpu prior to the place to search (i.e. return will be > @n) + * @src1p: the first cpumask pointer + * @src2p: the second cpumask pointer + * + * Return: >= nr_cpu_ids if no further cpus set in both. + */ +static __always_inline +unsigned int cpumask_next_andnot(int n, const struct cpumask *src1p, + const struct cpumask *src2p) +{ + /* -1 is a legal arg here. */ + if (n != -1) + cpumask_check(n); + return find_next_andnot_bit(cpumask_bits(src1p), cpumask_bits(src2p), + small_cpumask_bits, n + 1); +} + +/** * cpumask_next_and_wrap - get the next cpu in *src1p & *src2p, starting from * @n+1. If nothing found, wrap around and start from * the beginning @@ -323,6 +355,18 @@ unsigned int cpumask_next_wrap(int n, const struct cpumask *src) } /** + * cpumask_random - get random cpu in *src. + * @src: cpumask pointer + * + * Return: random set bit, or >= nr_cpu_ids if @src is empty. + */ +static __always_inline +unsigned int cpumask_random(const struct cpumask *src) +{ + return find_random_bit(cpumask_bits(src), nr_cpu_ids); +} + +/** * for_each_cpu - iterate over every cpu in a mask * @cpu: the (optionally unsigned) integer iterator * @mask: the cpumask pointer @@ -413,14 +457,18 @@ unsigned int cpumask_next_wrap(int n, const struct cpumask *src) * @cpu: the cpu to ignore. * * Often used to find any cpu but smp_processor_id() in a mask. + * If @cpu == -1, the function is equivalent to cpumask_any(). * Return: >= nr_cpu_ids if no cpus set. */ static __always_inline -unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) +unsigned int cpumask_any_but(const struct cpumask *mask, int cpu) { unsigned int i; - cpumask_check(cpu); + /* -1 is a legal arg here. */ + if (cpu != -1) + cpumask_check(cpu); + for_each_cpu(i, mask) if (i != cpu) break; @@ -433,16 +481,20 @@ unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) * @mask2: the second input cpumask * @cpu: the cpu to ignore * + * If @cpu == -1, the function is equivalent to cpumask_any_and(). * Returns >= nr_cpu_ids if no cpus set. */ static __always_inline unsigned int cpumask_any_and_but(const struct cpumask *mask1, const struct cpumask *mask2, - unsigned int cpu) + int cpu) { unsigned int i; - cpumask_check(cpu); + /* -1 is a legal arg here. */ + if (cpu != -1) + cpumask_check(cpu); + i = cpumask_first_and(mask1, mask2); if (i != cpu) return i; @@ -451,36 +503,47 @@ unsigned int cpumask_any_and_but(const struct cpumask *mask1, } /** - * cpumask_nth - get the Nth cpu in a cpumask - * @srcp: the cpumask pointer - * @cpu: the Nth cpu to find, starting from 0 + * cpumask_any_andnot_but - pick an arbitrary cpu from *mask1 & ~*mask2, but not this one. + * @mask1: the first input cpumask + * @mask2: the second input cpumask + * @cpu: the cpu to ignore * - * Return: >= nr_cpu_ids if such cpu doesn't exist. + * If @cpu == -1, the function returns the first matching cpu. + * Returns >= nr_cpu_ids if no cpus set. */ static __always_inline -unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp) +unsigned int cpumask_any_andnot_but(const struct cpumask *mask1, + const struct cpumask *mask2, + int cpu) { - return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu)); + unsigned int i; + + /* -1 is a legal arg here. */ + if (cpu != -1) + cpumask_check(cpu); + + i = cpumask_first_andnot(mask1, mask2); + if (i != cpu) + return i; + + return cpumask_next_andnot(cpu, mask1, mask2); } /** - * cpumask_nth_and - get the Nth cpu in 2 cpumasks - * @srcp1: the cpumask pointer - * @srcp2: the cpumask pointer + * cpumask_nth - get the Nth cpu in a cpumask + * @srcp: the cpumask pointer * @cpu: the Nth cpu to find, starting from 0 * * Return: >= nr_cpu_ids if such cpu doesn't exist. */ static __always_inline -unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, - const struct cpumask *srcp2) +unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp) { - return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), - small_cpumask_bits, cpumask_check(cpu)); + return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu)); } /** - * cpumask_nth_andnot - get the Nth cpu set in 1st cpumask, and clear in 2nd. + * cpumask_nth_and - get the Nth cpu in 2 cpumasks * @srcp1: the cpumask pointer * @srcp2: the cpumask pointer * @cpu: the Nth cpu to find, starting from 0 @@ -488,10 +551,10 @@ unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, * Return: >= nr_cpu_ids if such cpu doesn't exist. */ static __always_inline -unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1, +unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, const struct cpumask *srcp2) { - return find_nth_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), + return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits, cpumask_check(cpu)); } @@ -542,6 +605,18 @@ void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) __set_bit(cpumask_check(cpu), cpumask_bits(dstp)); } +/** + * cpumask_clear_cpus - clear cpus in a cpumask + * @dstp: the cpumask pointer + * @cpu: cpu number (< nr_cpu_ids) + * @ncpus: number of cpus to clear (< nr_cpu_ids) + */ +static __always_inline void cpumask_clear_cpus(struct cpumask *dstp, + unsigned int cpu, unsigned int ncpus) +{ + cpumask_check(cpu + ncpus - 1); + bitmap_clear(cpumask_bits(dstp), cpumask_check(cpu), ncpus); +} /** * cpumask_clear_cpu - clear a cpu in a cpumask @@ -559,22 +634,6 @@ static __always_inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp) } /** - * cpumask_assign_cpu - assign a cpu in a cpumask - * @cpu: cpu number (< nr_cpu_ids) - * @dstp: the cpumask pointer - * @bool: the value to assign - */ -static __always_inline void cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value) -{ - assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value); -} - -static __always_inline void __cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value) -{ - __assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value); -} - -/** * cpumask_test_cpu - test for a cpu in a cpumask * @cpu: cpu number (< nr_cpu_ids) * @cpumask: the cpumask pointer @@ -1074,6 +1133,9 @@ void init_cpu_possible(const struct cpumask *src); #define assign_cpu(cpu, mask, val) \ assign_bit(cpumask_check(cpu), cpumask_bits(mask), (val)) +#define __assign_cpu(cpu, mask, val) \ + __assign_bit(cpumask_check(cpu), cpumask_bits(mask), (val)) + #define set_cpu_possible(cpu, possible) assign_cpu((cpu), &__cpu_possible_mask, (possible)) #define set_cpu_enabled(cpu, enabled) assign_cpu((cpu), &__cpu_enabled_mask, (enabled)) #define set_cpu_present(cpu, present) assign_cpu((cpu), &__cpu_present_mask, (present)) |