linux-kernel - Re: [PATCH] drm/amd/display: reduce else-if to else in dcn32_calculate_dlg

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Date:   Tue, 31 Jan 2023 12:22:18 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Tom Rix <trix@...hat.com>
Cc:     harry.wentland@....com, sunpeng.li@....com,
        Rodrigo.Siqueira@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, jun.lei@....com, Alvin.Lee2@....com,
        Nevenko.Stupar@....com, Dillon.Varone@....com, george.shen@....com,
        rdunlap@...radead.org, David.Galiffi@....com,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: reduce else-if to else in dcn32_calculate_dlg_params()

Applied.  Thanks!

Alex

On Thu, Jan 26, 2023 at 3:50 PM Tom Rix <trix@...hat.com> wrote:
>
> cppcheck reports
> drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c:1403:76: style:
>   Expression is always true because 'else if' condition is opposite to previous condition at line 1396. [multiCondition]
>    } else if (context->res_ctx.pipe_ctx[i].stream->mall_stream_config.type == SUBVP_PHANTOM) {
>                                                                            ^
> drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c:1396:69: note: first condition
>    if (context->res_ctx.pipe_ctx[i].stream->mall_stream_config.type != SUBVP_PHANTOM) {
>                                                                     ^
> drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c:1403:76: note: else if condition is opposite to first condition
>    } else if (context->res_ctx.pipe_ctx[i].stream->mall_stream_config.type == SUBVP_PHANTOM) {
>
> It is not necessary to explicitly the check != condition, an else is simplier.
>
> Fixes: 238debcaebe4 ("drm/amd/display: Use DML for MALL SS and Subvp allocation calculations")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
> index 0dc1a03999b6..c96cbd88e20d 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
> @@ -1400,7 +1400,7 @@ static void dcn32_calculate_dlg_params(struct dc *dc, struct dc_state *context,
>                                         /* SS PSR On: all active surfaces part of streams not supporting PSR stored in MALL */
>                                         context->bw_ctx.bw.dcn.mall_ss_psr_active_size_bytes += context->res_ctx.pipe_ctx[i].surface_size_in_mall_bytes;
>                                 }
> -                       } else if (context->res_ctx.pipe_ctx[i].stream->mall_stream_config.type == SUBVP_PHANTOM) {
> +                       } else {
>                                 /* SUBVP: phantom surfaces only stored in MALL */
>                                 context->bw_ctx.bw.dcn.mall_subvp_size_bytes += context->res_ctx.pipe_ctx[i].surface_size_in_mall_bytes;
>                         }
> --
> 2.26.3
>