Constify stack argument for functions that don't modify it.

Reviewed by:	ed, kib, jhb

3 files changed, 26 insertions, 25 deletions

diff --git a/share/man/man9/stack.9 b/share/man/man9/stack.9
index 2c2b762..fee6b8f 100644
--- a/share/man/man9/stack.9
+++ b/share/man/man9/stack.9
@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 24, 2009
+.Dd November 16, 2011
 .Dt STACK 9
 .Os
 .Sh NAME
@@ -46,21 +46,21 @@ In the kernel configuration file:
 .Ft int
 .Fn stack_put "struct stack *st" "vm_offset_t pc"
 .Ft void
-.Fn stack_copy "struct stack *src" "struct stack dst"
+.Fn stack_copy "const struct stack *src" "struct stack dst"
 .Ft void
 .Fn stack_zero "struct stack *st"
 .Ft void
-.Fn stack_print "struct stack *st"
+.Fn stack_print "const struct stack *st"
 .Ft void
-.Fn stack_print_ddb "struct stack *st"
+.Fn stack_print_ddb "const struct stack *st"
 .Ft void
-.Fn stack_print_short "struct stack *st"
+.Fn stack_print_short "const struct stack *st"
 .Ft void
-.Fn stack_print_short_ddb "struct stack *st"
+.Fn stack_print_short_ddb "const struct stack *st"
 .Ft void
-.Fn stack_sbuf_print "struct sbuf sb*" "struct stack *st"
+.Fn stack_sbuf_print "struct sbuf sb*" "const struct stack *st"
 .Ft void
-.Fn stack_sbuf_print_ddb "struct sbuf sb*" "struct stack *st"
+.Fn stack_sbuf_print_ddb "struct sbuf sb*" "const struct stack *st"
 .Ft void
 .Fn stack_save "struct stack *st"
 .Sh DESCRIPTION
diff --git a/sys/kern/subr_stack.c b/sys/kern/subr_stack.c
index c26dad8..6408aec 100644
--- a/sys/kern/subr_stack.c
+++ b/sys/kern/subr_stack.c
@@ -77,7 +77,7 @@ stack_put(struct stack *st, vm_offset_t pc)
 }
 
 void
-stack_copy(struct stack *src, struct stack *dst)
+stack_copy(const struct stack *src, struct stack *dst)
 {
 
 	*dst = *src;
@@ -91,7 +91,7 @@ stack_zero(struct stack *st)
 }
 
 void
-stack_print(struct stack *st)
+stack_print(const struct stack *st)
 {
 	char namebuf[64];
 	long offset;
@@ -107,7 +107,7 @@ stack_print(struct stack *st)
 }
 
 void
-stack_print_short(struct stack *st)
+stack_print_short(const struct stack *st)
 {
 	char namebuf[64];
 	long offset;
@@ -127,7 +127,7 @@ stack_print_short(struct stack *st)
 }
 
 void
-stack_print_ddb(struct stack *st)
+stack_print_ddb(const struct stack *st)
 {
 	const char *name;
 	long offset;
@@ -143,7 +143,7 @@ stack_print_ddb(struct stack *st)
 
 #ifdef DDB
 void
-stack_print_short_ddb(struct stack *st)
+stack_print_short_ddb(const struct stack *st)
 {
 	const char *name;
 	long offset;
@@ -167,7 +167,7 @@ stack_print_short_ddb(struct stack *st)
  * other for use in the live kernel.
  */
 void
-stack_sbuf_print(struct sbuf *sb, struct stack *st)
+stack_sbuf_print(struct sbuf *sb, const struct stack *st)
 {
 	char namebuf[64];
 	long offset;
@@ -184,7 +184,7 @@ stack_sbuf_print(struct sbuf *sb, struct stack *st)
 
 #ifdef DDB
 void
-stack_sbuf_print_ddb(struct sbuf *sb, struct stack *st)
+stack_sbuf_print_ddb(struct sbuf *sb, const struct stack *st)
 {
 	const char *name;
 	long offset;
@@ -201,8 +201,8 @@ stack_sbuf_print_ddb(struct sbuf *sb, struct stack *st)
 
 #ifdef KTR
 void
-stack_ktr(u_int mask, const char *file, int line, struct stack *st, u_int depth,
-    int cheap)
+stack_ktr(u_int mask, const char *file, int line, const struct stack *st,
+    u_int depth, int cheap)
 {
 #ifdef DDB
 	const char *name;
diff --git a/sys/sys/stack.h b/sys/sys/stack.h
index 734b967..5531467 100644
--- a/sys/sys/stack.h
+++ b/sys/sys/stack.h
@@ -37,16 +37,17 @@ struct sbuf;
 struct stack	*stack_create(void);
 void		 stack_destroy(struct stack *);
 int		 stack_put(struct stack *, vm_offset_t);
-void		 stack_copy(struct stack *, struct stack *);
+void		 stack_copy(const struct stack *, struct stack *);
 void		 stack_zero(struct stack *);
-void		 stack_print(struct stack *);
-void		 stack_print_ddb(struct stack *);
-void		 stack_print_short(struct stack *);
-void		 stack_print_short_ddb(struct stack *);
-void		 stack_sbuf_print(struct sbuf *, struct stack *);
-void		 stack_sbuf_print_ddb(struct sbuf *, struct stack *);
+void		 stack_print(const struct stack *);
+void		 stack_print_ddb(const struct stack *);
+void		 stack_print_short(const struct stack *);
+void		 stack_print_short_ddb(const struct stack *);
+void		 stack_sbuf_print(struct sbuf *, const struct stack *);
+void		 stack_sbuf_print_ddb(struct sbuf *, const struct stack *);
 #ifdef KTR
-void		 stack_ktr(u_int, const char *, int, struct stack *, u_int, int);
+void		 stack_ktr(u_int, const char *, int, const struct stack *,
+		    u_int, int);
 #define	CTRSTACK(m, st, depth, cheap) do {				\
 	if (KTR_COMPILE & (m))						\
 		stack_ktr((m), __FILE__, __LINE__, st, depth, cheap);	\