[patch] slub: export CMPXCHG_DOUBLE_CPU_FAIL to userspace

[David Rientjes <rientjes@google.com>]

4fdccdfbb465 ("slub: Add statistics for this_cmpxchg_double failures") 
added CMPXCHG_DOUBLE_CPU_FAIL to show how many times 
this_cpu_cmpxchg_double has failed, but it also needs to be exported to 
userspace for consumption.

This will always be 0 if CONFIG_CMPXCHG_LOCAL is disabled.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: David Rientjes <rientjes@google.com>
---
 mm/slub.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4525,6 +4525,7 @@ STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head);
 STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail);
 STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees);
 STAT_ATTR(ORDER_FALLBACK, order_fallback);
+STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail);
 #endif
 
 static struct attribute *slab_attrs[] = {
@@ -4582,6 +4583,7 @@ static struct attribute *slab_attrs[] = {
 	&deactivate_to_tail_attr.attr,
 	&deactivate_remote_frees_attr.attr,
 	&order_fallback_attr.attr,
+	&cmpxchg_double_cpu_fail_attr.attr,
 #endif
 #ifdef CONFIG_FAILSLAB
 	&failslab_attr.attr,

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