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Date: Thu, 7 Jul 2022 16:38:10 -0400
From: Harry Wentland <harry.wentland@....com>
To: Alex Deucher <alexdeucher@...il.com>,
Zhongjun Tan <hbut_tan@....com>
Cc: "Leo (Sunpeng) Li" <sunpeng.li@....com>,
"Siqueira, Rodrigo" <Rodrigo.Siqueira@....com>,
"Deucher, Alexander" <alexander.deucher@....com>,
Christian Koenig <christian.koenig@....com>,
xinhui pan <Xinhui.Pan@....com>,
Dave Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
cai.huoqing@...ux.dev, Zhongjun Tan <tanzhongjun@...lpad.com>,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>,
amd-gfx list <amd-gfx@...ts.freedesktop.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amd/display: Fix unsigned expression compared with
zero
On 2022-07-07 14:22, Alex Deucher wrote:
> On Wed, Jul 6, 2022 at 3:41 AM Zhongjun Tan <hbut_tan@....com> wrote:
>>
>> From: Zhongjun Tan <tanzhongjun@...lpad.com>
>>
>> Fix unsigned expression compared with zero
>>
>> Signed-off-by: Zhongjun Tan <tanzhongjun@...lpad.com>
>> ---
>> .../gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
>> index 548cdef8a8ad..21e4af38b8c1 100644
>> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
>> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
>> @@ -244,8 +244,8 @@ static void handle_det_buf_split(struct display_mode_lib *mode_lib,
>> bool req128_c = false;
>> bool surf_linear = (pipe_src_param->sw_mode == dm_sw_linear);
>> bool surf_vert = (pipe_src_param->source_scan == dm_vert);
>> - unsigned int log2_swath_height_l = 0;
>> - unsigned int log2_swath_height_c = 0;
>> + int log2_swath_height_l = 0;
>> + int log2_swath_height_c = 0;
>
> @Wentland, Harry Can you comment on the required range needed for
> these integers? Maybe it would be better to just drop the comparisons
> with 0.
>
I'm not sure I see the problem we're trying to fix.
An unsigned int can be 0, so a x != 0 or x > 0 check
is still a valid check.
Harry
> Alex
>
>> unsigned int detile_buf_size_in_bytes = mode_lib->ip.det_buffer_size_kbytes * 1024;
>>
>> full_swath_bytes_packed_l = rq_param->misc.rq_l.full_swath_bytes;
>> --
>> 2.29.0
>>
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