Re: [PATCH] Fix rq->lock vs logbuf_lock unlock race

From: Peter Zijlstra
Date: Wed Feb 20 2013 - 03:45:24 EST

On Mon, 2013-02-18 at 12:53 +0000, Bu, Yitian wrote:
> This patch is for kernel V3.7.9
> From 8796f4a2175a323aaa49ea8dd0fe68678dd5dccd Mon Sep 17 00:00:00 2001
> From: ybu <ybu@xxxxxxxxxxxxxxxx>
> Date: Mon, 18 Feb 2013 19:52:01 +0800
> Subject: [PATCH] Fix rq->lock vs logbuf_lock unlock race
> fix up the fallout from commit 07354eb1a74d1 ("locking printk:
> Annotate logbuf_lock as raw")
> Release console_sem after unlocking the logbuf_lock avoids some lock
> inversion troubles between logbuf_lock and rq->lock.

Please clarify how and where.. you're not actually supposed to use
printk() while holding rq->lock.

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