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Commit 984f2f37 authored by Rusty Russell's avatar Rusty Russell Committed by Ingo Molnar
Browse files

cpumask: introduce new API, without changing anything, v3 



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: default avatarRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent cd83e42c

include/linux/cpumask.h

+52 −6
Original line number Diff line number Diff line
@@ -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)),		\

lib/cpumask.c

+2 −1
Original line number Diff line number Diff line
@@ -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());

}