linux-kernel - Re: [PATCH] drm/legacy: Fix type for drm_local

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Date:   Fri, 3 Apr 2020 10:28:52 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/legacy: Fix type for drm_local_map.offset

On Fri, Apr 3, 2020 at 8:54 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> On Thu, Apr 02, 2020 at 10:59:26PM +0100, Chris Wilson wrote:
> > drm_local_map.offset is not only used for resource_size_t but also
> > dma_addr_t which may be of different sizes.
> >
> > Reported-by: Nathan Chancellor <natechancellor@...il.com>
> > Fixes: 8e4ff9b56957 ("drm: Remove the dma_alloc_coherent wrapper for internal usage")
> > Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> > Cc: Dave Airlie <airlied@...il.com>
> > Cc: Nathan Chancellor <natechancellor@...il.com>
> > Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> > ---
> >  include/drm/drm_legacy.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/include/drm/drm_legacy.h b/include/drm/drm_legacy.h
> > index dcef3598f49e..aed382c17b26 100644
> > --- a/include/drm/drm_legacy.h
> > +++ b/include/drm/drm_legacy.h
> > @@ -136,7 +136,7 @@ struct drm_sg_mem {
> >   * Kernel side of a mapping
> >   */
> >  struct drm_local_map {
> > -     resource_size_t offset;  /**< Requested physical address (0 for SAREA)*/
> > +     dma_addr_t offset;       /**< Requested physical address (0 for SAREA)*/
> >       unsigned long size;      /**< Requested physical size (bytes) */
> >       enum drm_map_type type;  /**< Type of memory to map */
> >       enum drm_map_flags flags;        /**< Flags */
> > --
> > 2.20.1
> >
>
> Thanks for the quick fix!
>
> I ran it through my set of build tests and nothing else seems to have
> broken (at least not any more than it already is...).
>
> Tested-by: Nathan Chancellor <natechancellor@...il.com> # build

This works too, missed it when replying to Linus

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

Linux I guess this one is better, but like I explained it really
doesn't matter what we do with drm legacy code, it's a horror show
that should be disabled on all modern distros anyway. We just keep it
because of "never break old uapi". Maybe in a few years more ...
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch