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Date:   Thu, 21 May 2020 10:25:16 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Michel Lespinasse <walken@google.com>
Cc:     Vlastimil Babka <vbabka@suse.cz>, linux-mm <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
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        Matthew Wilcox <willy@infradead.org>,
        Liam Howlett <Liam.Howlett@oracle.com>,
        Jerome Glisse <jglisse@redhat.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        David Rientjes <rientjes@google.com>,
        Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Daniel Jordan <daniel.m.jordan@oracle.com>,
        John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH v6 12/12] mmap locking API: convert mmap_sem comments
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On Thu, 21 May 2020 00:50:56 -0700 Michel Lespinasse <walken@google.com> wrote:

> > >   * Must be called holding task's alloc_lock to protect task's mems_allowed
> > > - * and mempolicy.  May also be called holding the mmap_semaphore for write.
> > > + * and mempolicy.  May also be called holding the mmap_lockaphore for write.
> > >   */
> > >  static int mpol_set_nodemask(struct mempolicy *pol,
> > >                    const nodemask_t *nodes, struct nodemask_scratch *nsc)
> >
> > :)
> 
> Haha, good catch !

aww, you're all so cruel.  The world would be a better place if Linux
had lockaphores!