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cpumask: make cpumask_of_cpu_map generic

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If an arch doesn't define cpumask_of_cpu_map, create a generic
statically-initialized one for them.  This allows removal of the buggy
cpumask_of_cpu() macro (&cpumask_of_cpu() gives address of
out-of-scope var).

An arch with NR_CPUS of 4096 probably wants to allocate this itself
based on the actual number of CPUs, since otherwise they're using 2MB
of rodata (1024 cpus means 128k).  That's what
CONFIG_HAVE_CPUMASK_OF_CPU_MAP is for (only x86/64 does so at the
moment).

In future as we support more CPUs, we'll need to resort to a
get_cpu_map()/put_cpu_map() allocation scheme.

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jack Steiner <steiner@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis
2008-07-24 18:21:29 -07:00
committed by Ingo Molnar
parent 024e8ac044
commit b8d317d10c
2 changed files with 112 additions and 38 deletions
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41
include/linux/cpumask.h
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@@ -62,15 +62,7 @@
* int next_cpu_nr(cpu, mask) Next cpu past 'cpu', or nr_cpu_ids
*
* cpumask_t cpumask_of_cpu(cpu) Return cpumask with bit 'cpu' set
*ifdef CONFIG_HAS_CPUMASK_OF_CPU
* cpumask_of_cpu_ptr_declare(v) Declares cpumask_t *v
* cpumask_of_cpu_ptr_next(v, cpu) Sets v = &cpumask_of_cpu_map[cpu]
* cpumask_of_cpu_ptr(v, cpu) Combines above two operations
*else
* cpumask_of_cpu_ptr_declare(v) Declares cpumask_t _v and *v = &_v
* cpumask_of_cpu_ptr_next(v, cpu) Sets _v = cpumask_of_cpu(cpu)
* cpumask_of_cpu_ptr(v, cpu) Combines above two operations
*endif
* (can be used as an lvalue)
* CPU_MASK_ALL Initializer - all bits set
* CPU_MASK_NONE Initializer - no bits set
* unsigned long *cpus_addr(mask) Array of unsigned long's in mask
@@ -274,36 +266,9 @@ static inline void __cpus_shift_left(cpumask_t *dstp,
}
#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
extern cpumask_t *cpumask_of_cpu_map;
/* cpumask_of_cpu_map[] is in kernel/cpu.c */
extern const cpumask_t *cpumask_of_cpu_map;
#define cpumask_of_cpu(cpu) (cpumask_of_cpu_map[cpu])
#define cpumask_of_cpu_ptr(v, cpu) \
const cpumask_t *v = &cpumask_of_cpu(cpu)
#define cpumask_of_cpu_ptr_declare(v) \
const cpumask_t *v
#define cpumask_of_cpu_ptr_next(v, cpu) \
v = &cpumask_of_cpu(cpu)
#else
#define cpumask_of_cpu(cpu) \
({ \
typeof(_unused_cpumask_arg_) m; \
if (sizeof(m) == sizeof(unsigned long)) { \
m.bits[0] = 1UL<<(cpu); \
} else { \
cpus_clear(m); \
cpu_set((cpu), m); \
} \
m; \
})
#define cpumask_of_cpu_ptr(v, cpu) \
cpumask_t _##v = cpumask_of_cpu(cpu); \
const cpumask_t *v = &_##v
#define cpumask_of_cpu_ptr_declare(v) \
cpumask_t _##v; \
const cpumask_t *v = &_##v
#define cpumask_of_cpu_ptr_next(v, cpu) \
_##v = cpumask_of_cpu(cpu)
#endif
#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)