From: Rusty Russell on
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

Signed-off-by: Rusty Russell <rusty(a)>
Cc: Arnd Bergmann <arnd(a)>
Cc: anton(a)
Cc: KOSAKI Motohiro <kosaki.motohiro(a)>
Cc: Mike Travis <travis(a)>
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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