mlx5: fix __mlx5_bit_off macro warning for Windows
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Commit Message
While compiling with clang 11 the callers of the
__mlx5_bit_off macro warns on the cast of pointers to
unsigned long which is a smaller int type in Windows.
warning: cast to smaller integer type 'unsigned long'
from 'u8 (*)[16]' [-Wpointer-to-int-cast]
To resolve it the type is changed to size_t to be
compatible for both Linux and Windows.
Fixes: 865a0c15672c ("net/mlx5: add Direct Verbs prepare function")
Cc: stable@dpdk.org
Signed-off-by: Tal Shnaiderman <talshn@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
drivers/common/mlx5/mlx5_prm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Wed, 6 Jan 2021 15:42:21 +0200, Tal Shnaiderman wrote:
> While compiling with clang 11 the callers of the
> __mlx5_bit_off macro warns on the cast of pointers to
> unsigned long which is a smaller int type in Windows.
>
> warning: cast to smaller integer type 'unsigned long'
> from 'u8 (*)[16]' [-Wpointer-to-int-cast]
>
> To resolve it the type is changed to size_t to be
> compatible for both Linux and Windows.
uintptr_t is the type for integers storing pointer values, not size_t.
> Subject: Re: [dpdk-dev] [PATCH] mlx5: fix __mlx5_bit_off macro warning for
> Windows
>
> External email: Use caution opening links or attachments
>
>
> On Wed, 6 Jan 2021 15:42:21 +0200, Tal Shnaiderman wrote:
> > While compiling with clang 11 the callers of the __mlx5_bit_off macro
> > warns on the cast of pointers to unsigned long which is a smaller int
> > type in Windows.
> >
> > warning: cast to smaller integer type 'unsigned long'
> > from 'u8 (*)[16]' [-Wpointer-to-int-cast]
> >
> > To resolve it the type is changed to size_t to be compatible for both
> > Linux and Windows.
>
> uintptr_t is the type for integers storing pointer values, not size_t.
Correct, thanks.
@@ -601,7 +601,7 @@ typedef uint8_t u8;
#define __mlx5_nullp(typ) ((struct mlx5_ifc_##typ##_bits *)0)
#define __mlx5_bit_sz(typ, fld) sizeof(__mlx5_nullp(typ)->fld)
-#define __mlx5_bit_off(typ, fld) ((unsigned int)(unsigned long) \
+#define __mlx5_bit_off(typ, fld) ((unsigned int)(size_t) \
(&(__mlx5_nullp(typ)->fld)))
#define __mlx5_dw_bit_off(typ, fld) (32 - __mlx5_bit_sz(typ, fld) - \
(__mlx5_bit_off(typ, fld) & 0x1f))