linux-kernel - Re: [RFC][PATCH v2] mmc_block: Allow more than 8 partitions per card

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Message-ID: <1445537261.10397.70.camel@decadent.org.uk>
Date:	Thu, 22 Oct 2015 19:07:41 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	John Stultz <john.stultz@...aro.org>,
	Colin Cross <ccross@...roid.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Chuanxiao Dong <chuanxiao.dong@...el.com>,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Android Kernel Team <kernel-team@...roid.com>,
	linux-mmc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH v2] mmc_block: Allow more than 8 partitions per card

On Thu, 2015-10-22 at 10:00 -0700, John Stultz wrote:
> From: Colin Cross <ccross@...roid.com>
> 
> It is quite common for Android devices to utilize more
> then 8 partitions on internal eMMC storage.
> 
> The vanilla kernel can support this via
> CONFIG_MMC_BLOCK_MINORS, however that solution caps the
> system to 256 minors total, which limits the number of
> mmc cards the system can support.
[...]

This commit was intended to allow support for 256 cards with any number
of partitions:

commit a26eba614afff0e39594101bcb73014a9a22fb33
Author: Ben Hutchings <ben@...adent.org.uk>
Date:   Thu Nov 6 03:35:09 2014 +0000

    mmc: block: Increase max_devices

I don't think the new patch is sufficient or necessary to increase the
limit further.

Do you have a compatibility requirement to retain the numbering of the
first 7 partitions?

Ben.

-- 
Ben Hutchings
Q.  Which is the greater problem in the world today, ignorance or apathy?
A.  I don't know and I couldn't care less.

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