Re: [PATCH v2] contrib/vhost-user-gpu: Fix compiler warning when compiling with -Wshadow

[Michael S. Tsirkin]

On Mon, Oct 09, 2023 at 10:37:25AM +0200, Thomas Huth wrote:
> Rename some variables to avoid compiler warnings when compiling
> with -Wshadow=local.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  v2: Renamed the variable to something more unique
> 
>  contrib/vhost-user-gpu/vugpu.h          | 8 ++++----
>  contrib/vhost-user-gpu/vhost-user-gpu.c | 6 +++---
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/contrib/vhost-user-gpu/vugpu.h b/contrib/vhost-user-gpu/vugpu.h
> index 509b679f03..654c392fbb 100644
> --- a/contrib/vhost-user-gpu/vugpu.h
> +++ b/contrib/vhost-user-gpu/vugpu.h
> @@ -164,12 +164,12 @@ struct virtio_gpu_ctrl_command {
>  };
>  
>  #define VUGPU_FILL_CMD(out) do {                                \
> -        size_t s;                                               \
> -        s = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num, 0,  \
> +        size_t vugpufillcmd_s_ =                                \
> +            iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num, 0,  \
>                         &out, sizeof(out));                      \
> -        if (s != sizeof(out)) {                                 \
> +        if (vugpufillcmd_s_ != sizeof(out)) {                   \
>              g_critical("%s: command size incorrect %zu vs %zu", \
> -                       __func__, s, sizeof(out));               \
> +                       __func__, vugpufillcmd_s_, sizeof(out)); \
>              return;                                             \
>          }                                                       \
>      } while (0)

I think I prefer VUGPU_FILL_CMD_s or VUGPU_FILL_CMD_s_ - makes it clear
it's related to a macro.

> diff --git a/contrib/vhost-user-gpu/vhost-user-gpu.c 
> b/contrib/vhost-user-gpu/vhost-user-gpu.c
> index aa304475a0..bb41758e34 100644
> --- a/contrib/vhost-user-gpu/vhost-user-gpu.c
> +++ b/contrib/vhost-user-gpu/vhost-user-gpu.c
> @@ -834,7 +834,7 @@ vg_resource_flush(VuGpu *g,
>                  .width = width,
>                  .height = height,
>              };
> -            pixman_image_t *i =
> +            pixman_image_t *img =
>                  pixman_image_create_bits(pixman_image_get_format(res->image),
>                                           msg->payload.update.width,
>                                           msg->payload.update.height,
> @@ -842,11 +842,11 @@ vg_resource_flush(VuGpu *g,
>                                                        payload.update.data),
>                                           width * bpp);
>              pixman_image_composite(PIXMAN_OP_SRC,
> -                                   res->image, NULL, i,
> +                                   res->image, NULL, img,
>                                     extents->x1, extents->y1,
>                                     0, 0, 0, 0,
>                                     width, height);
> -            pixman_image_unref(i);
> +            pixman_image_unref(img);
>              vg_send_msg(g, msg, -1);
>              g_free(msg);
>          }
> -- 
> 2.41.0