linux-kernel - [PATCH 1/3] mtdblock: Update old JFFS2 mention in Kconfig

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Message-Id: <20210801234509.18774-2-ezequiel@collabora.com>
Date:   Sun,  1 Aug 2021 20:45:03 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Richard Weinberger <richard@....at>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: [PATCH 1/3] mtdblock: Update old JFFS2 mention in Kconfig

JFFS2 can be mounted without 'mtdblock' since
a really, really long time. Some git-log
archaeology shows that in 2006 it was possible
to use 'root=' to mount a JFFS2 rootfs:

  commit e9482b4374e2596e6f3f1ab30c4ea469f4ac6311
  Author: Joern Engel <joern@...fh-wedel.de>
  Date:   Tue May 30 14:25:46 2006 +0200

      [MTD] Allow alternate JFFS2 mount variant for root filesystem.

      With this patch, "root=mtd3" and "root=mtd:foo" work for a JFFS2 rootfs.

However, there are still plenty of tutorials that mention
mtdblock, so users are still taking this route. Update the Kconfig
to reflect this is no longer needed.

Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
---
 drivers/mtd/Kconfig | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 79a8ff542883..32bed6c63863 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -127,10 +127,9 @@ config MTD_BLOCK
 	  on RAM chips in this manner. This block device is a user of MTD
 	  devices performing that function.
 
-	  At the moment, it is also required for the Journalling Flash File
-	  System(s) to obtain a handle on the MTD device when it's mounted
-	  (although JFFS and JFFS2 don't actually use any of the functionality
-	  of the mtdblock device).
+	  Note that mounting a JFFS2 filesystem doesn't require using mtdblock.
+	  It's possible to mount a rootfs using the MTD device on the "root="
+	  bootargs as "root=mtd2" or "root=mtd:name_of_device".
 
 	  Later, it may be extended to perform read/erase/modify/write cycles
 	  on flash chips to emulate a smaller block size. Needless to say,
-- 
2.32.0