linux-kernel - Re: [PATCH 03/16] mm: simplify gup_fast

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Message-ID: <20190604072610.GE15680@lst.de>
Date:   Tue, 4 Jun 2019 09:26:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@....de>, Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Nicholas Piggin <npiggin@...il.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-mips@...r.kernel.org,
        Linux-sh list <linux-sh@...r.kernel.org>,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Linux-MM <linux-mm@...ck.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/16] mm: simplify gup_fast_permitted

On Mon, Jun 03, 2019 at 10:02:10AM -0700, Linus Torvalds wrote:
> On Mon, Jun 3, 2019 at 9:08 AM Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > The new code has no test at all for "nr_pages == 0", afaik.
> 
> Note that it really is important to check for that, because right now we do

True.  The 0 check got lost.  I'll make sure we do the right thing for
the next version.