[PATCH -next] psi: Make symbol 'psi_cgroups_enabled' static

[Wei Yongjun <weiyongjun1@xxxxxxxxxx>]

The sparse tool complains as follows:

kernel/sched/psi.c:151:1: warning:
 symbol 'psi_cgroups_enabled' was not declared. Should it be static?

This symbol is not used outside of psi.c, so marks it static.

Fixes: 3958e2d0c34e ("cgroup: make per-cgroup pressure stall tracking configurable")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 kernel/sched/psi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index b773cae4c24b..d6e32de2f6af 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -148,7 +148,7 @@
 static int psi_bug __read_mostly;
 
 DEFINE_STATIC_KEY_FALSE(psi_disabled);
-DEFINE_STATIC_KEY_TRUE(psi_cgroups_enabled);
+static DEFINE_STATIC_KEY_TRUE(psi_cgroups_enabled);
 
 #ifdef CONFIG_PSI_DEFAULT_DISABLED
 static bool psi_enable;