linux-kernel - Re: [PATCH -next] drm/nouveau/disp: fix cast removes address space of expression warnings

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Date:   Wed, 12 Oct 2022 18:48:46 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     ruanjinjie <ruanjinjie@...wei.com>, bskeggs@...hat.com,
        kherbst@...hat.com, airlied@...ux.ie, linux-kernel@...r.kernel.org,
        daniel@...ll.ch, jani.nikula@...el.com, airlied@...hat.com,
        tzimmermann@...e.de, hverkuil-cisco@...all.nl, greenfoo@....eu,
        seanpaul@...omium.org, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org
Subject: Re: [PATCH -next] drm/nouveau/disp: fix cast removes address space
 of expression warnings

...oops, totally forgot to actually give you the magic tag so patchwork knows
I reviewed it:

Reviewed-by: Lyude Paul <lyude@...hat.com>

On Sat, 2022-09-24 at 17:25 +0800, ruanjinjie wrote:
> When build Linux kernel with 'make C=2', encounter the following warnings:
> 
> ./drivers/gpu/drm/nouveau/dispnv50/disp.c:134:34: warning: cast removes address space '__iomem' of expression
> ./drivers/gpu/drm/nouveau/dispnv50/disp.c:197:34: warning: cast removes address space '__iomem' of expression
> 
> The data type of dmac->_push.mem.object.map.ptr is 'void __iomem *', but
> converted to 'u32 *' directly and cause above warnings, now
> recover their data types to fix these warnings.
> 
> Signed-off-by: ruanjinjie <ruanjinjie@...wei.com>
> ---
>  drivers/gpu/drm/nouveau/dispnv50/disp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> index 33c97d510999..aa94f8e284dd 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> @@ -131,7 +131,7 @@ nv50_dmac_kick(struct nvif_push *push)
>  {
>  	struct nv50_dmac *dmac = container_of(push, typeof(*dmac), _push);
>  
> -	dmac->cur = push->cur - (u32 *)dmac->_push.mem.object.map.ptr;
> +	dmac->cur = push->cur - (u32 __iomem *)dmac->_push.mem.object.map.ptr;
>  	if (dmac->put != dmac->cur) {
>  		/* Push buffer fetches are not coherent with BAR1, we need to ensure
>  		 * writes have been flushed right through to VRAM before writing PUT.
> @@ -194,7 +194,7 @@ nv50_dmac_wait(struct nvif_push *push, u32 size)
>  	if (WARN_ON(size > dmac->max))
>  		return -EINVAL;
>  
> -	dmac->cur = push->cur - (u32 *)dmac->_push.mem.object.map.ptr;
> +	dmac->cur = push->cur - (u32 __iomem *)dmac->_push.mem.object.map.ptr;
>  	if (dmac->cur + size >= dmac->max) {
>  		int ret = nv50_dmac_wind(dmac);
>  		if (ret)

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat