linux-kernel - Re: [PATCH] drm: Fix misleading documentation of drm_gem_cma

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Message-ID: <YLZchmKujXJoyp1y@phenom.ffwll.local>
Date:   Tue, 1 Jun 2021 18:12:54 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        list@...ndingux.net,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: Re: [PATCH] drm: Fix misleading documentation of drm_gem_cma_create()

On Tue, Jun 01, 2021 at 10:54:05AM +0100, Paul Cercueil wrote:
> The backing memory does not necessarily have the writecombine attribute
> set, since commit cf8ccbc72d61 ("drm: Add support for GEM buffers backed
> by non-coherent memory").
> 
> Fixes: cf8ccbc72d61 ("drm: Add support for GEM buffers backed by non-coherent memory")
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

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

> ---
>  drivers/gpu/drm/drm_gem_cma_helper.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
> index 4a24af2c5c43..d53388199f34 100644
> --- a/drivers/gpu/drm/drm_gem_cma_helper.c
> +++ b/drivers/gpu/drm/drm_gem_cma_helper.c
> @@ -104,8 +104,7 @@ __drm_gem_cma_create(struct drm_device *drm, size_t size, bool private)
>   * @size: size of the object to allocate
>   *
>   * This function creates a CMA GEM object and allocates a contiguous chunk of
> - * memory as backing store. The backing memory has the writecombine attribute
> - * set.
> + * memory as backing store.
>   *
>   * Returns:
>   * A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
> -- 
> 2.30.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch