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SubjectRe: [RFC PATCHv2 02/21] cma: Introduce cma_for_each_area
2017-03-18 1:54 GMT+01:00 Laura Abbott <labbott@redhat.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@linaro.org>

>
> Signed-off-by: Laura Abbott <labbott@redhat.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

Graphic Study Group

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