[PATCH v2 3/9] mm: percpu: fix obj_exts metadata charge size

[Alexandre Ghiti]

pcpu_obj_full_size() uses sizeof(struct obj_cgroup *) to charge the size
of the percpu obj_exts metadata. But obj_exts is actually a vector of
struct pcpuobj_ext, whose size, when CONFIG_MEM_ALLOC_PROFILING is
enabled, is 16B and not 8B like sizeof(struct obj_cgroup *) currently
returns.

Fix that by using sizeof(struct pcpuobj_ext) instead.

Fixes: 8f30d2660a38 ("mm: percpu: introduce pcpuobj_ext")
Signed-off-by: Alexandre Ghiti <alex@xxxxxxxx>
---
 mm/percpu-internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index 8cbe039bf847..d1c0a508710e 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -156,7 +156,7 @@ static inline size_t pcpu_obj_full_size(size_t size)
 
 #ifdef CONFIG_MEMCG
 	if (!mem_cgroup_kmem_disabled())
-		extra_size += size / PCPU_MIN_ALLOC_SIZE * sizeof(struct obj_cgroup *);
+		extra_size += size / PCPU_MIN_ALLOC_SIZE * sizeof(struct pcpuobj_ext);
 #endif
 
 	return size * num_possible_cpus() + extra_size;
-- 
2.54.0