Re: [PATCH RESEND v6] mmc: core: Remove bounce buffer in mmc_send_cxd_data()

[Chris Ball]

Hi,

On Thu, Aug 02 2012, Kyungsik Lee wrote:
> It is expected that Extended CSD register(the size of this register
> is larger than CID/CSD) will be referenced more frequently as more
> fields have been added to Extended CSD and it seems that it is not
> a good option to double the memory used.
>
> This patch is intended to avoid the use of bounce buffer for reading
> Extended CSD register in mmc_send_cxd_data(). It will provide a better
> performance gain by removing memcpy() overhead for a half KiB and
> a redundant bounce buffer allocated repeatedly at the cost of providing
> DMA-capable buffer from upper caller(but on-stack buffer is allowed
> with no performance gain).
>
> Signed-off-by: Kyungsik Lee <kyungsik.lee@xxxxxxx>
> Reviewed-by: Venkatraman S <svenkatr@xxxxxx>

Thanks, pushed to mmc-next for 3.7.

- Chris.
-- 
Chris Ball   <cjb@xxxxxxxxxx>   <http://printf.net/>
One Laptop Per Child
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/