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Commit 77586c2b authored by Mike Travis's avatar Mike Travis Committed by Ingo Molnar
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cpumask: Provide a generic set of CPUMASK_ALLOC macros 



  * Provide a generic set of CPUMASK_ALLOC macros patterned after the
    SCHED_CPUMASK_ALLOC macros.  This is used where multiple cpumask_t
    variables are declared on the stack to reduce the amount of stack
    space required.

Signed-off-by: default avatarMike Travis <travis@sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 4755b929

include/linux/cpumask.h

+21 −0
Original line number Diff line number Diff line
@@ -75,6 +75,17 @@ 
 * CPU_MASK_NONE			Initializer - no bits set

 * unsigned long *cpus_addr(mask)	Array of unsigned long's in mask

 *

 *if NR_CPUS > BITS_PER_LONG

 *   CPUMASK_ALLOC(m)			Declares and allocates struct m *m =

 *					   (struct m *)kmalloc(sizeof(*m), ...)

 *   CPUMASK_FREE(m)			Macro for kfree(v)

 *else

 *   CPUMASK_ALLOC(m)			Declares struct m _m, *m = &_m

 *   CPUMASK_FREE(m)			Nop

 *endif

 *   CPUMASK_VAR(v, m)			Declares cpumask_t *v =

 *						m + offset(struct m, v)

 *

 * int cpumask_scnprintf(buf, len, mask) Format cpumask for printing

 * int cpumask_parse_user(ubuf, ulen, mask)	Parse ascii string as cpumask

 * int cpulist_scnprintf(buf, len, mask) Format cpumask as list for printing
@@ -311,6 +322,16 @@ extern cpumask_t cpu_mask_all; 


#define cpus_addr(src) ((src).bits)



#if NR_CPUS > BITS_PER_LONG

#define	CPUMASK_ALLOC(m)	struct m *m = kmalloc(sizeof(*m), GFP_KERNEL)

#define	CPUMASK_FREE(m)		kfree(m)

#else

#define	CPUMASK_ALLOC(m)	struct allmasks _m, *m = &_m

#define	CPUMASK_FREE(m)

#endif

#define	CPUMASK_VAR(v, m) 	cpumask_t *v = (cpumask_t *)		\

				((unsigned long)(m) + offsetof(struct m, v))



#define cpumask_scnprintf(buf, len, src) \

			__cpumask_scnprintf((buf), (len), &(src), NR_CPUS)

static inline int __cpumask_scnprintf(char *buf, int len,