linux-kernel - Re: [RFC PATCH 08/12] cma: Store a name in the cma structure

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Date:   Fri, 17 Mar 2017 11:02:34 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>
Cc:     Riley Andrews <riandrews@...roid.com>,
        Arve Hj�nnev�g 
        <arve@...roid.com>, Rom Lemarchand <romlem@...gle.com>,
        devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>,
        Linaro MM SIG <linaro-mm-sig@...ts.linaro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC PATCH 08/12] cma: Store a name in the cma structure

On 03/10/2017 12:53 AM, Sumit Semwal wrote:
> Hi Laura,
> 
> Thanks for the patch.
> 
> On 3 March 2017 at 03:14, Laura Abbott <labbott@...hat.com> wrote:
>>
>> Frameworks that may want to enumerate CMA heaps (e.g. Ion) will find it
>> useful to have an explicit name attached to each region. Store the name
>> in each CMA structure.
>>
>> Signed-off-by: Laura Abbott <labbott@...hat.com>
>> ---
>>  drivers/base/dma-contiguous.c |  5 +++--
>>  include/linux/cma.h           |  4 +++-
>>  mm/cma.c                      | 11 +++++++++--
>>  mm/cma.h                      |  1 +
>>  mm/cma_debug.c                |  2 +-
>>  5 files changed, 17 insertions(+), 6 deletions(-)
>>
> <snip>
>> +const char *cma_get_name(const struct cma *cma)
>> +{
>> +       return cma->name ? cma->name : "(undefined)";
>> +}
>> +
> Would it make sense to perhaps have the idx stored as the name,
> instead of 'undefined'? That would make sure that the various cma
> names are still unique.
> 

Good suggestion. I'll see about cleaning that up.

>>  static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
>>                                              int align_order)
>>  {
>> @@ -168,6 +173,7 @@ core_initcall(cma_init_reserved_areas);
>>   */
>>  int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
>>                                  unsigned int order_per_bit,
>> +                                const char *name,
>>                                  struct cma **res_cma)
>>  {
> 
> Best regards,
> Sumit.
>