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cpumask: introduce new API, without changing anything, v3

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Impact: cleanup

Clean up based on feedback from Andrew Morton and others:

 - change to inline functions instead of macros
 - add __init to bootmem method
 - add a missing debug check

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rusty Russell 2008-11-08 20:24:19 +11:00 committed by Ingo Molnar
parent cd83e42c6b
commit 984f2f377f
2 changed files with 54 additions and 7 deletions
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58
include/linux/cpumask.h
View File

@ -564,12 +564,36 @@ static inline unsigned int cpumask_check(unsigned int cpu)
}
#if NR_CPUS == 1
/* Uniprocesor. */
#define cpumask_first(src) ({ (void)(src); 0; })
#define cpumask_next(n, src) ({ (void)(src); 1; })
#define cpumask_next_zero(n, src) ({ (void)(src); 1; })
#define cpumask_next_and(n, srcp, andp) ({ (void)(srcp), (void)(andp); 1; })
#define cpumask_any_but(mask, cpu) ({ (void)(mask); (void)(cpu); 0; })
/* Uniprocessor. Assume all masks are "1". */
static inline unsigned int cpumask_first(const struct cpumask *srcp)
{
return 0;
}
/* Valid inputs for n are -1 and 0. */
static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
{
return n+1;
}
static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
{
return n+1;
}
static inline unsigned int cpumask_next_and(int n,
const struct cpumask *srcp,
const struct cpumask *andp)
{
return n+1;
}
/* cpu must be a valid cpu, ie 0, so there's no other choice. */
static inline unsigned int cpumask_any_but(const struct cpumask *mask,
unsigned int cpu)
{
return 1;
}
#define for_each_cpu(cpu, mask) \
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
@ -620,10 +644,32 @@ static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
/**
* for_each_cpu - iterate over every cpu in a mask
* @cpu: the (optionally unsigned) integer iterator
* @mask: the cpumask pointer
*
* After the loop, cpu is >= nr_cpu_ids.
*/
#define for_each_cpu(cpu, mask) \
for ((cpu) = -1; \
(cpu) = cpumask_next((cpu), (mask)), \
(cpu) < nr_cpu_ids;)
/**
* for_each_cpu_and - iterate over every cpu in both masks
* @cpu: the (optionally unsigned) integer iterator
* @mask: the first cpumask pointer
* @and: the second cpumask pointer
*
* This saves a temporary CPU mask in many places. It is equivalent to:
* struct cpumask tmp;
* cpumask_and(&tmp, &mask, &and);
* for_each_cpu(cpu, &tmp)
* ...
*
* After the loop, cpu is >= nr_cpu_ids.
*/
#define for_each_cpu_and(cpu, mask, and) \
for ((cpu) = -1; \
(cpu) = cpumask_next_and((cpu), (mask), (and)), \

3
lib/cpumask.c
View File

@ -67,6 +67,7 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
{
unsigned int i;
cpumask_check(cpu);
for_each_cpu(i, mask)
if (i != cpu)
break;
@ -108,7 +109,7 @@ void free_cpumask_var(cpumask_var_t mask)
}
EXPORT_SYMBOL(free_cpumask_var);
void free_bootmem_cpumask_var(cpumask_var_t mask)
void __init free_bootmem_cpumask_var(cpumask_var_t mask)
{
free_bootmem((unsigned long)mask, cpumask_size());
}