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| author | Mike Travis <travis@sgi.com> | 2008-07-16 01:14:36 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-19 00:03:00 +0400 |
| commit | 77586c2bdad0798cb24e35de5a878e7c6b200574 (patch) | |
| tree | ba400aecb986671fb70d2fb0c80140ac2fdedfb5 | |
| parent | 4755b9291204982ac908e069674d6e5eb45815b3 (diff) | |
| download | linux-77586c2bdad0798cb24e35de5a878e7c6b200574.tar.xz | |
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: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/cpumask.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 2dbd9a287e77..72f9c32c12b0 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -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, |