linux-kernel - Re: linux-next: build failure after merge of the drm tree

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Date:   Thu, 6 Oct 2022 09:28:10 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     David Airlie <airlied@...hat.com>
Cc:     Hamza Mahfooz <hamza.mahfooz@....com>,
        Alex Deucher <alexdeucher@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: linux-next: build failure after merge of the drm tree

Hi all,

On Wed, 5 Oct 2022 12:45:31 -0400 Hamza Mahfooz <hamza.mahfooz@....com> wrote:
>
> On 2022-10-05 11:30, Alex Deucher wrote:
> > @Mahfooz, Hamza
> > @Aurabindo Pillai can you get this fixed up?
> >   
> 
> Seems like this is a false positive for GCC versions pre-12, because I'm not seeing this warning on GCC 12.2.
> However, we can fix this for older GCC versions with the following:
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
> index 9e6025c98db9..67fede4bf248 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
> +++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
> @@ -238,7 +238,7 @@ struct dc_stream_state {
> 
>   	/* writeback */
>   	unsigned int num_wb_info;
> -	struct dc_writeback_info writeback_info[MAX_DWB_PIPES];
> +	struct dc_writeback_info writeback_info[MAX_DWB_PIPES + 1];
>   	const struct dc_transfer_func *func_shaper;
>   	const struct dc_3dlut *lut3d_func;
>   	/* Computed state bits */

This is now in Linus' tree :-(

I have applied the following hack for today:

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Thu, 6 Oct 2022 09:14:26 +1100
Subject: [PATCH] fix up for drivers/gpu/drm/amd/display/dc/core/dc_stream.c

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index ae13887756bf..a5da787b7876 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -520,9 +520,9 @@ bool dc_stream_remove_writeback(struct dc *dc,
 	}
 
 	/* remove writeback info for disabled writeback pipes from stream */
-	for (i = 0, j = 0; i < stream->num_wb_info && j < MAX_DWB_PIPES; i++) {
+	for (i = 0, j = 0; i < stream->num_wb_info && i < MAX_DWB_PIPES; i++) {
 		if (stream->writeback_info[i].wb_enabled) {
-			if (i != j)
+			if ((j >= 0) && (j < i))
 				/* trim the array */
 				stream->writeback_info[j] = stream->writeback_info[i];
 			j++;
-- 
2.35.1

-- 
Cheers,
Stephen Rothwell

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