linux-kernel - Re: [RFC PATCHv2 02/21] cma: Introduce cma_for_each

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Message-ID: <CA+M3ks6F_9dhfD4DLMJ=GNsr=H86_XLyiBHvzvz6+akjLSNBUw@mail.gmail.com>
Date:   Wed, 29 Mar 2017 10:48:36 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Riley Andrews <riandrews@...roid.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Rom Lemarchand <romlem@...gle.com>, devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Mark Brown <broonie@...nel.org>, Linux MM <linux-mm@...ck.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [RFC PATCHv2 02/21] cma: Introduce cma_for_each_area

2017-03-18 1:54 GMT+01:00 Laura Abbott <labbott@...hat.com>:
>
> Frameworks (e.g. Ion) may want to iterate over each possible CMA area to
> allow for enumeration. Introduce a function to allow a callback.

even outside ION rework that could be useful

Reviewed-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>

>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
>  include/linux/cma.h |  2 ++
>  mm/cma.c            | 14 ++++++++++++++
>  2 files changed, 16 insertions(+)
>
> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index d41d1f8..3e8fbf5 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -34,4 +34,6 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
>  extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
>                               gfp_t gfp_mask);
>  extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
> +
> +extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
>  #endif
> diff --git a/mm/cma.c b/mm/cma.c
> index 0d187b1..9a040e1 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -498,3 +498,17 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
>
>         return true;
>  }
> +
> +int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data)
> +{
> +       int i;
> +
> +       for (i = 0; i < cma_area_count; i++) {
> +               int ret = it(&cma_areas[i], data);
> +
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       return 0;
> +}
> --
> 2.7.4
>



-- 
Benjamin Gaignard

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