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

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Message-ID: <20201006164120.GI4734@nvidia.com>
Date:   Tue, 6 Oct 2020 13:41:20 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
CC:     Dave Airlie <airlied@...ux.ie>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Leon Romanovsky <leonro@...dia.com>,
        Maor Gottlieb <maorg@...dia.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the hmm tree

On Tue, Oct 06, 2020 at 08:35:08PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the hmm tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
> 
> 
> Caused by commit
> 
>   07da1223ec93 ("lib/scatterlist: Add support in dynamic allocation of SG table from pages")
> 
> interacting with commit
> 
>   707d561f77b5 ("drm: allow limiting the scatter list size.")
> 
> from the drm tree.
> 
> I have added the following merge fix patch
> 
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Tue, 6 Oct 2020 20:22:51 +1100
> Subject: [PATCH] lib/scatterlist: merge fix for "drm: allow limiting the
>  scatter list size."
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
>  drivers/gpu/drm/drm_prime.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 11fe9ff76fd5..83ac901b65a2 100644
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -807,6 +807,7 @@ struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
>  				       struct page **pages, unsigned int nr_pages)
>  {
>  	struct sg_table *sg = NULL;
> +	struct scatterlist *sl;
>  	size_t max_segment = 0;
>  	int ret;
>  
> @@ -820,11 +821,13 @@ struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
>  		max_segment = dma_max_mapping_size(dev->dev);
>  	if (max_segment == 0 || max_segment > SCATTERLIST_MAX_SEGMENT)
>  		max_segment = SCATTERLIST_MAX_SEGMENT;
> -	ret = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
> +	sl = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
>  					  nr_pages << PAGE_SHIFT,
> -					  max_segment, GFP_KERNEL);
> -	if (ret)
> +					  max_segment, NULL, 0, GFP_KERNEL);
> +	if (IS_ERR(sl)) {
> +		ret = PTR_ERR(sl);
>  		goto out;
> +	}
>  
>  	return sg;
>  out:

This looks OK to me, thanks

Jason