linux-kernel - Re: [PATCH] mm/cma.c: find a named CMA area by name

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Message-ID: <3cb5e071-c5c0-47f8-96e9-526ca5dbfc62@redhat.com>
Date:   Tue, 14 Jan 2020 10:02:25 +0100
From:   David Hildenbrand <david@...hat.com>
To:     buddy.zhang@...yun.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/cma.c: find a named CMA area by name

On 14.01.20 08:51, buddy.zhang@...yun.com wrote:
> From: BuddyZhang <buddy.zhang@...yun.com>
> 
> This function could help developer who want to find a special
> named CMA area.

*could help* - if there is no user, why do we need it? Or do you have a
user?

> 
> The CMA supports multiple named CMA areas, and the device could
> use or exclusive a special CAM arae via "cma_area" on "struct
> device". When probing, the device can setup special CMA area which
> find by "cma_find_by_name()".
> 
> If device can't find named CMA area, "cma_find_by_name()" will
> return NULL, and device will used default CMA area.
> 
> Signed-off-by: BuddyZhang <buddy.zhang@...yun.com>
> ---
>  mm/cma.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/mm/cma.c b/mm/cma.c
> index be55d1988c67..b562557572c4 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -40,6 +40,18 @@ struct cma cma_areas[MAX_CMA_AREAS];
>  unsigned cma_area_count;
>  static DEFINE_MUTEX(cma_mutex);
>  
> +struct cma *cma_find_by_name(const char *name)
> +{
> +	int idx;
> +
> +	for (idx = 0; idx < MAX_CMA_AREAS; idx++) {
> +		if (cma_areas[idx].name && !strcmp(name, cma_areas[idx].name))
> +			return &cma_areas[idx];
> +	}
> +	return NULL;
> +}
> +EXPORT_SYMBOL(cma_find_by_name)
> +
>  phys_addr_t cma_get_base(const struct cma *cma)
>  {
>  	return PFN_PHYS(cma->base_pfn);
> 


-- 
Thanks,

David / dhildenb