linux-kernel - Re: [PATCH] drm: fix drm_get_max

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Message-ID: <20180222162031.GF223881@art_vandelay>
Date:   Thu, 22 Feb 2018 11:20:31 -0500
From:   Sean Paul <seanpaul@...omium.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Alex Deucher <alexander.deucher@....com>,
        Monk Liu <monk.liu@....com>,
        Christian König <christian.koenig@....com>,
        Michel Dänzer <michel.daenzer@....com>,
        Chunming Zhou <david1.zhou@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: fix drm_get_max_iomem type mismatch

On Thu, Feb 22, 2018 at 12:47:51PM +0100, Arnd Bergmann wrote:
> When comparing two variables with min()/max(), they should be the same type:
> 
> drivers/gpu/drm/drm_memory.c: In function 'drm_get_max_iomem':
> include/linux/kernel.h:821:16: error: comparison of distinct pointer types lacks a cast [-Werror]
>   (void) (&max1 == &max2);
> 
> This makes the local variable in drm_get_max_iomem make the type
> from resource->end.
> 
> Fixes: 82626363a217 ("drm: add func to get max iomem address v2")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks Arnd, I've applied this to drm-misc-next.

Sean

> ---
>  drivers/gpu/drm/drm_memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
> index 7ca500b8c399..3c54044214db 100644
> --- a/drivers/gpu/drm/drm_memory.c
> +++ b/drivers/gpu/drm/drm_memory.c
> @@ -153,7 +153,7 @@ EXPORT_SYMBOL(drm_legacy_ioremapfree);
>  u64 drm_get_max_iomem(void)
>  {
>  	struct resource *tmp;
> -	u64 max_iomem = 0;
> +	resource_size_t max_iomem = 0;
>  
>  	for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
>  		max_iomem = max(max_iomem,  tmp->end);
> -- 
> 2.9.0
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS