[PATCH] mm: memcg: declare do_memsw_account inline

[John Sperbeck <jsperbeck@google.com>]

In commit 66d60c428b23 ("mm: memcg: move legacy memcg event code
into memcontrol-v1.c"), the static do_memsw_account() function was
moved from a .c file to a .h file.  Unfortunately, the traditional
inline keyword wasn't added.  If a file (e.g., a unit test) includes
the .h file, but doesn't refer to do_memsw_account(), it will get a
warning like:

mm/memcontrol-v1.h:41:13: warning: unused function 'do_memsw_account' [-Wunused-function]
   41 | static bool do_memsw_account(void)
      |             ^~~~~~~~~~~~~~~~

Fixes: 66d60c428b23 ("mm: memcg: move legacy memcg event code into memcontrol-v1.c")
Signed-off-by: John Sperbeck <jsperbeck@google.com>
---
 mm/memcontrol-v1.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
index 0e3b82951d91..144d71b65907 100644
--- a/mm/memcontrol-v1.h
+++ b/mm/memcontrol-v1.h
@@ -38,7 +38,7 @@ void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n);
 	     iter = mem_cgroup_iter(NULL, iter, NULL))
 
 /* Whether legacy memory+swap accounting is active */
-static bool do_memsw_account(void)
+static inline bool do_memsw_account(void)
 {
 	return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
 }
-- 
2.47.0.338.g60cca15819-goog