cppcheck: Suppress constParameterCallback errors

We have several functions which are used as callbacks for NS_CALL() which
only read their void * parameter, they don't write it.  The
constParameterCallback warning in cppcheck 2.14.1 complains that this
parameter could be const void *, also pointing out that that would require
casting the function pointer when used as a callback.

Casting the function pointers seems substantially uglier than using a
non-const void * as the parameter, especially since in each case we cast
the void * to a const pointer of specific type immediately.  So, suppress
these errors.

I think it would make logical sense to suppress this globally, but that
would cause unmatchedSuppression errors on earlier cppcheck versions.  So,
instead individually suppress it, along with unmatchedSuppression in the
relevant places.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

3 files changed, 3 insertions, 0 deletions

diff --git a/pasta.c b/pasta.c
index 31e1e00..b85ea2b 100644
--- a/pasta.c
+++ b/pasta.c
@@ -176,6 +176,7 @@ struct pasta_spawn_cmd_arg {
  *
  * Return: this function never returns
  */
+/* cppcheck-suppress [constParameterCallback, unmatchedSuppression] */
 static int pasta_spawn_cmd(void *arg)
 {
 	const struct pasta_spawn_cmd_arg *a;
diff --git a/tcp.c b/tcp.c
index cb613cf..dd8d46e 100644
--- a/tcp.c
+++ b/tcp.c
@@ -3079,6 +3079,7 @@ void tcp_ns_sock_init(const struct ctx *c, in_port_t port)
  *
  * Return: 0
  */
+/* cppcheck-suppress [constParameterCallback, unmatchedSuppression] */
 static int tcp_ns_socks_init(void *arg)
 {
 	const struct ctx *c = (const struct ctx *)arg;
diff --git a/tcp_splice.c b/tcp_splice.c
index 3f9d395..5a406c6 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -736,6 +736,7 @@ static void tcp_splice_pipe_refill(const struct ctx *c)
  *
  * Return: 0
  */
+/* cppcheck-suppress [constParameterCallback, unmatchedSuppression] */
 static int tcp_sock_refill_ns(void *arg)
 {
 	const struct ctx *c = (const struct ctx *)arg;