Messages in this thread Patch in this message | | | From | Rusty Russell <> | Date | Thu, 19 Nov 2009 19:31:36 +1030 | Subject | [PATCH 6/6] cpumask: reduce cpumask_size |
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Now we're sure noone is using old cpumask operators, nor *cpumask, we can allocate less bits safely. This reduces the memory usage of off-stack cpumasks when CONFIG_CPUMASK_OFFSTACK=y but we don't have NR_CPUS actual cpus.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> --- include/linux/cpumask.h | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -1014,13 +1014,11 @@ static inline int cpulist_parse(const ch /** * cpumask_size - size to allocate for a 'struct cpumask' in bytes * - * This will eventually be a runtime variable, depending on nr_cpu_ids. + * This can be a runtime variable, depending on nr_cpu_ids. */ static inline size_t cpumask_size(void) { - /* FIXME: Once all cpumask assignments are eliminated, this - * can be nr_cpumask_bits */ - return BITS_TO_LONGS(NR_CPUS) * sizeof(long); + return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long); } /*
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