From: Andi Kleen <ak@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Adam Litke <agl@us.ibm.com>, dean gaudet <dean@arctic.org>,
William Lee Irwin III <wli@holomorphy.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, clameter@sgi.com
Subject: Re: [shm][hugetlb] Fix get_policy for stacked shared memory files
Date: Tue, 12 Jun 2007 12:20:11 +0200 [thread overview]
Message-ID: <200706121220.11332.ak@suse.de> (raw)
In-Reply-To: <20070611213020.b3d91757.akpm@linux-foundation.org>
> Can we just double-check the refcounting please?
>
> > index 4fefbad..8d2672d 100644
> > --- a/ipc/shm.c
> > +++ b/ipc/shm.c
> > @@ -254,8 +254,10 @@ struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr)
> >
> > if (sfd->vm_ops->get_policy)
> > pol = sfd->vm_ops->get_policy(vma, addr);
>
> afacit this takes a ref on the underlying policy
>
> > - else
> > + else if (vma->vm_policy)
> > pol = vma->vm_policy;
> > + else
> > + pol = current->mempolicy;
>
> but these two do not.
>
> > return pol;
> > }
> > #endif
>
> Is is all correct?
No it looks broken.
-Andi
next prev parent reply other threads:[~2007-06-12 10:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-16 5:41 2.6.21 numa policy and huge pages not working dean gaudet
2007-05-16 6:12 ` William Lee Irwin III
2007-06-09 18:06 ` dean gaudet
2007-06-10 4:10 ` dean gaudet
2007-06-10 4:51 ` William Lee Irwin III
2007-06-11 16:23 ` Adam Litke
2007-06-11 21:34 ` [shm][hugetlb] Fix get_policy for stacked shared memory files Adam Litke
2007-06-12 3:36 ` dean gaudet
2007-06-12 3:51 ` William Lee Irwin III
2007-06-12 4:30 ` Andrew Morton
2007-06-12 4:48 ` William Lee Irwin III
2007-06-12 10:20 ` Andi Kleen [this message]
2007-06-12 6:20 ` Eric W. Biederman
2007-06-12 6:58 ` William Lee Irwin III
2007-06-12 14:32 ` Adam Litke
2007-06-12 18:22 ` Eric W. Biederman
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