[PATCH 2/2] alloc_tag: skip pgalloc_tag_swap if profiling is disabled

[Suren Baghdasaryan <surenb@google.com>]

When memory allocation profiling is disabled, there is no need to swap
allocation tags during migration. Skip it to avoid unnecessary overhead.

Fixes: e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Cc: stable@vger.kernel.org
---
 lib/alloc_tag.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 4c373f444eb1..4e5d7af3eaa2 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -197,6 +197,9 @@ void pgalloc_tag_swap(struct folio *new, struct folio *old)
 	union codetag_ref ref_old, ref_new;
 	struct alloc_tag *tag_old, *tag_new;
 
+	if (!mem_alloc_profiling_enabled())
+		return;
+
 	tag_old = pgalloc_tag_get(&old->page);
 	if (!tag_old)
 		return;
-- 
2.47.1.613.gc27f4b7a9f-goog