linux-kernel - [PATCH net-next] net/mlx5: Use cpumask_available() in mlx5_eq_create

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Message-Id: <20210618000358.2402567-1-nathan@kernel.org>
Date:   Thu, 17 Jun 2021 17:03:59 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH net-next] net/mlx5: Use cpumask_available() in mlx5_eq_create_generic()

When CONFIG_CPUMASK_OFFSTACK is unset, cpumask_var_t is not a pointer
but a single element array, meaning its address in a structure cannot be
NULL as long as it is not the first element, which it is not. This
results in a clang warning:

drivers/net/ethernet/mellanox/mlx5/core/eq.c:715:14: warning: address of
array 'param->affinity' will always evaluate to 'true'
[-Wpointer-bool-conversion]
        if (!param->affinity)
            ~~~~~~~~^~~~~~~~
1 warning generated.

The helper cpumask_available was added in commit f7e30f01a9e2 ("cpumask:
Add helper cpumask_available()") to handle situations like this so use
it to keep the meaning of the code the same while resolving the warning.

Fixes: e4e3f24b822f ("net/mlx5: Provide cpumask at EQ creation phase")
Link: https://github.com/ClangBuiltLinux/linux/issues/1400
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 7e5b3826eae5..d3356771e628 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -710,7 +710,7 @@ mlx5_eq_create_generic(struct mlx5_core_dev *dev,
 	struct mlx5_eq *eq = kvzalloc(sizeof(*eq), GFP_KERNEL);
 	int err;
 
-	if (!param->affinity)
+	if (!cpumask_available(param->affinity))
 		return ERR_PTR(-EINVAL);
 
 	if (!eq)

base-commit: 8fe088bd4fd12f4c8899b51d5bc3daad98767d49
-- 
2.32.0.93.g670b81a890