[RFC PATCH v3 06/18] dyndbg: accept null site in ddebug_change

[Jim Cromie <jim.cromie@gmail.com>]

fix a debug-print that includes site info, by adding an alternate
debug message that does not.

no functional changes.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 lib/dynamic_debug.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index abe3382aabd5..151e55ab6bb5 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -235,10 +235,17 @@ static int ddebug_change(const struct ddebug_query *query,
 				static_branch_enable(&dp->key.dd_key_true);
 #endif
 			dp->flags = newflags;
-			v2pr_info("changed %s:%d [%s]%s =%s\n",
-				 trim_prefix(dc->filename), dp->lineno,
-				 dt->mod_name, dc->function,
-				 ddebug_describe_flags(dp->flags, &fbuf));
+
+			if (dc)
+				v2pr_info("changed %s:%d [%s]%s =%s\n",
+					  trim_prefix(dc->filename), dp->lineno,
+					  dt->mod_name, dc->function,
+					  ddebug_describe_flags(dp->flags, &fbuf));
+			else
+				v2pr_info("changed %s:%d =%s \"%s\"\n",
+					  dt->mod_name, dp->lineno,
+					  ddebug_describe_flags(dp->flags, &fbuf),
+					  dp->format);
 		}
 	}
 	mutex_unlock(&ddebug_lock);
-- 
2.29.2