From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v3] mmc: block: delete packed command support
Date: Mon, 28 Nov 2016 00:23:40 -0800
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To: Alex Lemberg <Alex.Lemberg@sandisk.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>, Linus Walleij <linus.walleij@linaro.org>, "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>, Chunyan Zhang <zhang.chunyan@linaro.org>, Baolin Wang <baolin.wang@linaro.org>, Namjae Jeon <namjae.jeon@samsung.com>, Maya Erez <qca_merez@qca.qualcomm.com>

On Sun, Nov 27, 2016 at 02:25:15PM +0000, Alex Lemberg wrote:
> I understand your concerns about the current packed commands
> support and the problem of transition to blk_mq.
> But as I mentioned in previous email thread, the packed commands
> feature is still in use on eMMC4.5 or eMMC5.1 devices on hosts
> without SW/HW CMDQ support.
> Taking this feature out meaning stop supporting one of important
> performance features of eMMC devices.
> Looking forward this feature is replaced with a CMDQ, but should we
> kill it for those who doesn’t have a CMDQ? 

No driver actually uses it, as-is it's simply dead code.