linux-kernel - audit_tree: sleep inside atomic

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Message-ID: <4C1F8217.5020909@gmail.com>
Date:	Mon, 21 Jun 2010 17:15:35 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Eric Paris <eparis@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: audit_tree: sleep inside atomic

Hi,

stanse found a sleep inside atomic added by the following commit:
commit fb36de479642bc9bdd3af251ae48b882d8a1ad5d
Author: Eric Paris <eparis@...hat.com>
Date:   Thu Dec 17 20:12:05 2009 -0500

    audit: reimplement audit_trees using fsnotify rather than inotify

    Simply switch audit_trees from using inotify to using fsnotify for it's
    inode pinning and disappearing act information.

    Signed-off-by: Eric Paris <eparis@...hat.com>


In untag_chunk, there is
  spin_lock(&entry->lock);
  ...
  new = alloc_chunk(size);
  ...
  spin_unlock(&entry->lock);

with
static struct audit_chunk *alloc_chunk(int count)
{
  struct audit_chunk *chunk;
  ...
  chunk = kzalloc(size, GFP_KERNEL);

But this can sleep. How big the allocations are? Could it be ATOMIC or
moved outside the spinlock?

thanks,
-- 
js
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