diff options
| author | Dawei Li <dawei.li@shingroup.cn> | 2024-04-16 16:54:48 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-04-24 21:23:49 +0200 |
| commit | cdc66553c4130735f0a2db943a5259e54ff1597a (patch) | |
| tree | ec3ebe0bd50ede88a8dc482b80aacb2412a25e4b /include/linux/cpumask.h | |
| parent | c7cad38d37486668a448215fc92bace9c8cf747a (diff) | |
cpumask: Introduce cpumask_first_and_and()
Introduce cpumask_first_and_and() to get intersection between 3 cpumasks,
free of any intermediate cpumask variable. Instead, cpumask_first_and_and()
works in-place with all inputs and produces desired output directly.
Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Yury Norov <yury.norov@gmail.com>
Link: https://lore.kernel.org/r/20240416085454.3547175-2-dawei.li@shingroup.cn
Diffstat (limited to 'include/linux/cpumask.h')
| -rw-r--r-- | include/linux/cpumask.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 1c29947db848..c46f9e9e1d66 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -188,6 +188,23 @@ unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask } /** + * cpumask_first_and_and - return the first cpu from *srcp1 & *srcp2 & *srcp3 + * @srcp1: the first input + * @srcp2: the second input + * @srcp3: the third input + * + * Return: >= nr_cpu_ids if no cpus set in all. + */ +static inline +unsigned int cpumask_first_and_and(const struct cpumask *srcp1, + const struct cpumask *srcp2, + const struct cpumask *srcp3) +{ + return find_first_and_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), + cpumask_bits(srcp3), small_cpumask_bits); +} + +/** * cpumask_last - get the last CPU in a cpumask * @srcp: - the cpumask pointer * |