linux-kernel - [PATCH 0/3] Fix zswap init failure behavior

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Message-Id: <20170124200259.16191-1-ddstreet@ieee.org>
Date:   Tue, 24 Jan 2017 15:02:56 -0500
From:   Dan Streetman <ddstreet@...e.org>
To:     Linux-MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dan Streetman <ddstreet@...e.org>,
        Seth Jennings <sjenning@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] Fix zswap init failure behavior

If zswap fails to initialize itself at boot, it returns error from its
init function; but for built-in drivers, that does not unload them; and
more importantly, it doesn't prevent their sysfs module param interface
from being created.  In this case, changing the compressor or zpool param
will result in a WARNING because zswap didn't expect them to be changed if
initialization failed.

These patches fix that assumption, as well as allowing pool creation after
a failed initialization, if only the zpool and/or compressor creation
failed.

Dan Streetman (3):
  zswap: disable changing params if init fails
  zswap: allow initialization at boot without pool
  zswap: clear compressor or zpool param if invalid at init

 mm/zswap.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 100 insertions(+), 25 deletions(-)

-- 
2.9.3