| Message ID | 20210618000358.2402567-1-nathan@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [net-next] net/mlx5: Use cpumask_available() in mlx5_eq_create_generic() | expand |
On Thu, Jun 17, 2021 at 05:03:59PM -0700, Nathan Chancellor wrote: > 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@kernel.org> > --- > drivers/net/ethernet/mellanox/mlx5/core/eq.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Thanks, Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
On Thu, 2021-06-17 at 17:03 -0700, Nathan Chancellor wrote: > 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@kernel.org> > --- Applied to net-next-mlx5 Thanks!
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)
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@kernel.org> --- drivers/net/ethernet/mellanox/mlx5/core/eq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: 8fe088bd4fd12f4c8899b51d5bc3daad98767d49