[PATCH -next v2] coresight: core: Make symbol 'csdev_sink' static

The sparse tool complains as follows:

drivers/hwtracing/coresight/coresight-core.c:26:1: warning:
 symbol '__pcpu_scope_csdev_sink' was not declared. Should it be static?

As csdev_sink is not used outside of coresight-core.c after the
introduction of coresight_[set|get]_percpu_sink() helpers, this
change marks it static.

Reported-by: Hulk Robot <redacted>
Signed-off-by: Wei Yongjun <redacted>
---
v1 -> v2: remove fixes tag and description.
---
 drivers/hwtracing/coresight/coresight-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 3e779e1619ed..6c68d34d956e 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c

@@ -23,7 +23,7 @@
 #include "coresight-priv.h"
 
 static DEFINE_MUTEX(coresight_mutex);
-DEFINE_PER_CPU(struct coresight_device *, csdev_sink);
+static DEFINE_PER_CPU(struct coresight_device *, csdev_sink);
 
 /**
  * struct coresight_node - elements of a path, from source to sink

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