[PATCH v2] IB/mlx4: Avoid implicit enumerated type conversion

From: Nathan Chancellor <natechancellor@gmail.com>
To: Doug Ledford <dledford@redhat.com>, Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH v2] IB/mlx4: Avoid implicit enumerated type conversion
Date: Thu, 27 Sep 2018 13:43:53 -0700	[thread overview]
Message-ID: <20180927204352.19569-1-natechancellor@gmail.com> (raw)
In-Reply-To: <20180924195716.30848-1-natechancellor@gmail.com>

Clang warns when one enumerated type is implicitly converted to another.

drivers/infiniband/hw/mlx4/mad.c:1811:41: warning: implicit conversion
from enumeration type 'enum mlx4_ib_qp_flags' to different enumeration
type 'enum ib_qp_create_flags' [-Wenum-conversion]
                qp_init_attr.init_attr.create_flags = MLX4_IB_SRIOV_TUNNEL_QP;
                                                    ~ ^~~~~~~~~~~~~~~~~~~~~~~

drivers/infiniband/hw/mlx4/mad.c:1819:41: warning: implicit conversion
from enumeration type 'enum mlx4_ib_qp_flags' to different enumeration
type 'enum ib_qp_create_flags' [-Wenum-conversion]
                qp_init_attr.init_attr.create_flags = MLX4_IB_SRIOV_SQP;
                                                    ~ ^~~~~~~~~~~~~~~~~

The type mlx4_ib_qp_flags explicitly provides supplemental values to the
type ib_qp_create_flags. Make that clear to Clang by changing the
create_flags type to int.

Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---

v1 -> v2:

* Use int instead of u32 since enums are restricted to this range, as
  suggested by Nick.

 include/rdma/ib_verbs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 0d822a9db300..e5ec04e844cd 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1151,7 +1151,7 @@ struct ib_qp_init_attr {
 	struct ib_qp_cap	cap;
 	enum ib_sig_type	sq_sig_type;
 	enum ib_qp_type		qp_type;
-	enum ib_qp_create_flags	create_flags;
+	int			create_flags;
 
 	/*
 	 * Only needed for special QP types, or when using the RW API.
-- 
2.19.0

