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cpumask: replace cpumask_next_* with cpumask_first_* where appropriate

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cpumask_first() is a more effective analogue of 'next' version if n == -1
(which means start == 0). This patch replaces 'next' with 'first' where
things look trivial.

There's no cpumask_first_zero() function, so create it.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Yury Norov
2021-08-14 14:17:05 -07:00
parent 4ade0818cf
commit 9b51d9d866
6 changed files with 22 additions and 6 deletions
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16
include/linux/cpumask.h
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@@ -123,6 +123,11 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp)
return 0;
}
static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
{
return 0;
}
static inline unsigned int cpumask_first_and(const struct cpumask *srcp1,
const struct cpumask *srcp2)
{
@@ -201,6 +206,17 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp)
return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
}
/**
* cpumask_first_zero - get the first unset cpu in a cpumask
* @srcp: the cpumask pointer
*
* Returns >= nr_cpu_ids if all cpus are set.
*/
static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
{
return find_first_zero_bit(cpumask_bits(srcp), nr_cpumask_bits);
}
/**
* cpumask_first_and - return the first cpu from *srcp1 & *srcp2
* @src1p: the first input