Constify arguments for locking KPIs where possible.

This enables locking consumers to pass their own structures around as const and
be able to assert locks embedded into those structures.

Reviewed by:	ed, kib, jhb

1 files changed, 4 insertions, 3 deletions

diff --git a/sys/kern/subr_witness.c b/sys/kern/subr_witness.c
index 130c7b3..bbf9a97 100644
--- a/sys/kern/subr_witness.c
+++ b/sys/kern/subr_witness.c
@@ -332,7 +332,7 @@ static void	depart(struct witness *w);
 static struct witness	*enroll(const char *description,
 			    struct lock_class *lock_class);
 static struct lock_instance	*find_instance(struct lock_list_entry *list,
-				    struct lock_object *lock);
+				    const struct lock_object *lock);
 static int	isitmychild(struct witness *parent, struct witness *child);
 static int	isitmydescendant(struct witness *parent, struct witness *child);
 static void	itismychild(struct witness *parent, struct witness *child);
@@ -2063,7 +2063,7 @@ witness_lock_list_free(struct lock_list_entry *lle)
 }
 
 static struct lock_instance *
-find_instance(struct lock_list_entry *list, struct lock_object *lock)
+find_instance(struct lock_list_entry *list, const struct lock_object *lock)
 {
 	struct lock_list_entry *lle;
 	struct lock_instance *instance;
@@ -2210,7 +2210,8 @@ witness_restore(struct lock_object *lock, const char *file, int line)
 }
 
 void
-witness_assert(struct lock_object *lock, int flags, const char *file, int line)
+witness_assert(const struct lock_object *lock, int flags, const char *file,
+    int line)
 {
 #ifdef INVARIANT_SUPPORT
 	struct lock_instance *instance;