From: Matias Bjorling <m@bjorling.me>
Date: Tue, 10 Dec 2013 15:50:38 +0000 (+0100)
Subject: null_blk: mem garbage on NUMA systems during init
X-Git-Tag: v3.13-rc4~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57053d8c5c59562cac156513740c10b502a40968;p=pandora-kernel.git

null_blk: mem garbage on NUMA systems during init

For NUMA systems, initializing the blk-mq layer and using per node hctx.
We initialize submit queues to 1, while blk-mq nr_hw_queues is
initialized to the number of NUMA nodes.

This makes the null_init_hctx function overwrite memory outside of what
it allocated.  In my case it lead to writing garbage into struct
request_queue's mq_map.

Signed-off-by: Matias Bjorling <m@bjorling.me>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

Reading git-diff-tree failed