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[PATCH] Convert highest_possible_processor_id to nr_cpu_ids

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We frequently need the maximum number of possible processors in order to
allocate arrays for all processors.  So far this was done using
highest_possible_processor_id().  However, we do need the number of
processors not the highest id.  Moreover the number was so far dynamically
calculated on each invokation.  The number of possible processors does not
change when the system is running.  We can therefore calculate that number
once.

Signed-off-by: Christoph Lameter <[email protected]>
Cc: Frederik Deweerdt <[email protected]>
Cc: Neil Brown <[email protected]>
Cc: Trond Myklebust <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2007-02-20 13:57:51 -08:00 • committed by Linus Torvalds
commit 53b8a315b7
5 changed files with 17 additions and 29 deletions
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18
lib/cpumask.c
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@ -15,22 +15,8 @@ int __next_cpu(int n, const cpumask_t *srcp)
}
EXPORT_SYMBOL(__next_cpu);
/*
* Find the highest possible smp_processor_id()
*
* Note: if we're prepared to assume that cpu_possible_map never changes
* (reasonable) then this function should cache its return value.
*/
int highest_possible_processor_id(void)
{
unsigned int cpu;
unsigned highest = 0;
for_each_cpu_mask(cpu, cpu_possible_map)
highest = cpu;
return highest;
}
EXPORT_SYMBOL(highest_possible_processor_id);
int nr_cpu_ids;
EXPORT_SYMBOL(nr_cpu_ids);
int __any_online_cpu(const cpumask_t *mask)
{