Re: [PATCH v2 4/6] hw/net/imx_fec: Rewrite fall through comments

[Thomas Huth <thuth@redhat.com>]

On 18/12/2019 20.25, Philippe Mathieu-Daudé wrote:
> GCC9 is confused by this comment when building with CFLAG
> -Wimplicit-fallthrough=2:
> 
>   hw/net/imx_fec.c: In function ‘imx_eth_write’:
>   hw/net/imx_fec.c:906:12: error: this statement may fall through [-Werror=implicit-fallthrough=]
>     906 |         if (unlikely(single_tx_ring)) {
>         |            ^
>   hw/net/imx_fec.c:912:5: note: here
>     912 |     case ENET_TDAR:     /* FALLTHROUGH */
>         |     ^~~~
>   cc1: all warnings being treated as errors
> 
> Rewrite the comments in the correct place,  using 'fall through'
> which is recognized by GCC and static analyzers.
> 
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> Cc: Peter Chubb <peter.chubb@nicta.com.au>
> Cc: Peter Maydell <peter.maydell@linaro.org>
> Cc: Jason Wang <jasowang@redhat.com>
> Cc: qemu-arm@nongnu.org
> ---
>  hw/net/imx_fec.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
> index bd99236864..c01ce4f078 100644
> --- a/hw/net/imx_fec.c
> +++ b/hw/net/imx_fec.c
> @@ -909,7 +909,8 @@ static void imx_eth_write(void *opaque, hwaddr offset, uint64_t value,
>                            TYPE_IMX_FEC, __func__);
>              return;
>          }
> -    case ENET_TDAR:     /* FALLTHROUGH */
> +        /* fall through */
> +    case ENET_TDAR:
>          if (s->regs[ENET_ECR] & ENET_ECR_ETHEREN) {
>              s->regs[index] = ENET_TDAR_TDAR;
>              imx_eth_do_tx(s, index);
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>