clang-tidy 20.1.8 doesn't like (VHOST_USER_MAX_VQS / 2), because it expands to (2 / 2). But in the context of the #define, this makes logical sense, so suppress the warning. I'm not sure why it isn't firing on the debug() line just below. Possibly it only complains once per expression per function, so we only have to suppress it once? Signed-off-by: David Gibson --- vhost_user.c | 1 + 1 file changed, 1 insertion(+) diff --git a/vhost_user.c b/vhost_user.c index fa343a86..223332d5 100644 --- a/vhost_user.c +++ b/vhost_user.c @@ -939,6 +939,7 @@ static bool vu_get_queue_num_exec(struct vu_dev *vdev, { (void)vdev; + /* NOLINTNEXTLINE(misc-redundant-expression) */ vmsg_set_reply_u64(vmsg, VHOST_USER_MAX_VQS / 2); debug("VHOST_USER_MAX_VQS %u", VHOST_USER_MAX_VQS / 2); -- 2.51.0

At least some cppcheck versions (2.18.3 for me) complain that the _storage variables in dhcpv6() could be reduced in scope. That's not actually the case, because although we don't reference the variables, we may touch their memory via pointers after the blocks in question. There's no reasonable way for cppcheck to determine that, though, so suppress its warnings. Signed-off-by: David Gibson --- dhcpv6.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/dhcpv6.c b/dhcpv6.c index c1a27aba..e4df0db5 100644 --- a/dhcpv6.c +++ b/dhcpv6.c @@ -550,10 +550,18 @@ int dhcpv6(struct ctx *c, struct iov_tail *data, { const struct opt_server_id *server_id = NULL; const struct opt_hdr *client_id = NULL; + /* The _storage variables can't be local to the blocks they're used in, + * because IOV_*_HEADER() may return pointers to them which are + * dereferenced afterwards. Since we don't have Rust-like lifetime + * tracking, cppcheck can't reasonably determine that, so we must + * suppress its warnings. */ + /* cppcheck-suppress [variableScope,unmatchedSuppression] */ struct opt_server_id server_id_storage; struct iov_tail opt, client_id_base; const struct opt_ia_na *ia = NULL; + /* cppcheck-suppress [variableScope,unmatchedSuppression] */ struct opt_hdr client_id_storage; + /* cppcheck-suppress [variableScope,unmatchedSuppression] */ struct opt_ia_na ia_storage; const struct in6_addr *src; struct msg_hdr mh_storage; -- 2.51.0