Re: [PATCH] drm/amd/display: Reduce stack size in the mode support function

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On 2022-07-24 17:41, Stephen Rothwell wrote:
Hi all,

On Fri, 22 Jul 2022 14:12:44 -0400 Alex Deucher <alexdeucher@xxxxxxxxx> wrote:

On Fri, Jul 22, 2022 at 1:56 PM Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx> wrote:

When we use the allmodconfig option we see the following error:

drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c: In function 'dml32_ModeSupportAndSystemConfigurationFull':
drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:3799:1: error: the frame size of 2464 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
   3799 | } // ModeSupportAndSystemConfigurationFull

This commit fixes this issue by moving part of the mode support
operation from ModeSupportAndSystemConfigurationFull to a dedicated
function.

Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>

Thanks for sorting this out!
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>

Tested-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>

Also, after applying the above patch, the following commits are no
longer needed:

987949933127 drm/amd/display: reduce stack for dml32_CalculatePrefetchSchedule
8f08cd32b767 drm/amd/display: reduce stack for dml32_CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport
5d526d124fe3 drm/amd/display: reduce stack for dml32_CalculateVMRowAndSwath
f6ceebcc7825 drm/amd/display: reduce stack for dml32_CalculateSwathAndDETConfiguration

and could be reverted (or removed).

Ohhh... that's nice!

Alex, if you don't mind, I would prefer to revert the above patches to keep things simpler. If it is ok for you, I can prepare the revert patches.

Thanks
Siqueira



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