There are times when we really want a static cpumask. Yet we don't want to expose the struct cpumask definition, to avoid casual on-stack usage and assignment. So this macro allows you to do DECLARE_BITMAP(map, CONFIG_NR_CPUS); then use to_cpumask() to turn it into a cpumask as needed. Ugly? Yes, but as we move to fewer static cpumasks these calls vanish. From: Rusty Russell <rusty@xxxxxxxxxxxxxxx> Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx> Signed-off-by: Mike Travis <travis@xxxxxxx> --- include/linux/cpumask.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) --- linux-2.6.28.orig/include/linux/cpumask.h +++ linux-2.6.28/include/linux/cpumask.h @@ -57,6 +57,9 @@ * CPU_MASK_NONE Initializer - no bits set * unsigned long *cpumask_bits(mask) Array of unsigned long's in mask * + * struct cpumask *to_cpumask(const unsigned long[]) + * Convert a bitmap to a cpumask. + * * ------------------------------------------------------------------------ * * int cpumask_scnprintf(buf, len, mask) Format cpumask for printing @@ -362,6 +365,17 @@ static inline void cpumask_copy(struct c #define cpumask_any(srcp) cpumask_first(srcp) #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) +/* Used for static bitmaps of CONFIG_NR_CPUS bits. Must be a constant to use + * as an initializer. */ +#define to_cpumask(bitmap) \ + ((struct cpumask *)(1 ? (bitmap) \ + : (void *)sizeof(__check_is_bitmap(bitmap)))) + +static inline int __check_is_bitmap(const unsigned long *bitmap) +{ + return 1; +} + /* * Special-case data structure for "single bit set only" constant CPU masks. * -- -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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