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SubjectRe: [PATCH] drm/dp: annotate implicit fall throughs
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On 1/14/19 2:27 PM, Mathieu Malaterre wrote:
> There is a plan to build the kernel with -Wimplicit-fallthrough and
> these places in the code produced warnings (W=1). Fix them up.
>
> This commit remove the following warnings:
>
> include/linux/compiler.h:77:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
> include/asm-generic/bug.h:134:2: note: in expansion of macro 'unlikely'
> drivers/gpu/drm/drm_dp_helper.c:155:3: note: in expansion of macro 'WARN'
> include/linux/compiler.h:77:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
> include/asm-generic/bug.h:134:2: note: in expansion of macro 'unlikely'
> drivers/gpu/drm/drm_dp_helper.c:173:3: note: in expansion of macro 'WARN'
> drivers/gpu/drm/drm_dp_helper.c:547:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>
> Signed-off-by: Mathieu Malaterre <malat@debian.org>
Acked-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

> ---
> drivers/gpu/drm/drm_dp_helper.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 516e82d0ed50..26835d174939 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -154,6 +154,7 @@ u8 drm_dp_link_rate_to_bw_code(int link_rate)
> default:
> WARN(1, "unknown DP link rate %d, using %x\n", link_rate,
> DP_LINK_BW_1_62);
> + /* fall through */
> case 162000:
> return DP_LINK_BW_1_62;
> case 270000:
> @@ -171,6 +172,7 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw)
> switch (link_bw) {
> default:
> WARN(1, "unknown DP link BW code %x, using 162000\n", link_bw);
> + /* fall through */
> case DP_LINK_BW_1_62:
> return 162000;
> case DP_LINK_BW_2_7:
> @@ -552,6 +554,7 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
> case DP_DS_16BPC:
> return 16;
> }
> + /* fall through */
> default:
> return 0;
> }
>

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