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Date: Tue, 15 Jan 2019 13:12:07 -0800
From: Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH 6/6] drivers/IB,core: reduce scope of mmap_sem
Message-ID: <20190115211207.GD6310@bombadil.infradead.org>
References: <20190115181300.27547-1-dave@stgolabs.net>
 <20190115181300.27547-7-dave@stgolabs.net>
 <20190115205311.GD22031@mellanox.com>
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Sender: owner-linux-mm@kvack.org
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To: Jason Gunthorpe <jgg@mellanox.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>, "akpm@linux-foundation.org" <akpm@linux-foundation.org>, "dledford@redhat.com" <dledford@redhat.com>, "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Davidlohr Bueso <dbueso@suse.de>

On Tue, Jan 15, 2019 at 08:53:16PM +0000, Jason Gunthorpe wrote:
> > -	new_pinned = atomic_long_read(&mm->pinned_vm) + npages;
> > +	new_pinned = atomic_long_add_return(npages, &mm->pinned_vm);
> >  	if (new_pinned > lock_limit && !capable(CAP_IPC_LOCK)) {
> 
> I thought a patch had been made for this to use check_overflow...

That got removed again by patch 1 ...