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Date:   Tue, 2 Apr 2019 16:43:57 -0700
From:   Davidlohr Bueso <dave@stgolabs.net>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Daniel Jordan <daniel.m.jordan@oracle.com>,
        Alan Tull <atull@kernel.org>,
        Alexey Kardashevskiy <aik@ozlabs.ru>,
        Alex Williamson <alex.williamson@redhat.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Christoph Lameter <cl@linux.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Moritz Fischer <mdf@kernel.org>,
        Paul Mackerras <paulus@ozlabs.org>, Wu Hao <hao.wu@intel.com>,
        linux-mm@kvack.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-fpga@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/6] mm: change locked_vm's type from unsigned long to
 atomic64_t
Message-ID: <20190402234357.tn3tik4r7k6nbrau@linux-r8p5>
Mail-Followup-To: Andrew Morton <akpm@linux-foundation.org>,
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        Alex Williamson <alex.williamson@redhat.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Christoph Lameter <cl@linux.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Moritz Fischer <mdf@kernel.org>, Paul Mackerras <paulus@ozlabs.org>,
        Wu Hao <hao.wu@intel.com>, linux-mm@kvack.org, kvm@vger.kernel.org,
        kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org
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On Tue, 02 Apr 2019, Andrew Morton wrote:

>Also, we didn't remove any down_write(mmap_sem)s from core code so I'm
>thinking that the benefit of removing a few mmap_sem-takings from a few
>obscure drivers (sorry ;)) is pretty small.

afaik porting the remaining incorrect users of locked_vm to pinned_vm was
the next step before this one, which made converting locked_vm to atomic
hardly worth it. Daniel?

Thanks,
Davidlohr