linux-kernel - Re: [linux-next PATCH] mm/gup.c: Convert to use get_user_{page|pages}_fast

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Date:   Tue, 26 May 2020 16:10:43 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Paul Mackerras <paulus@...abs.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, acme@...nel.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        jolsa@...hat.com, namhyung@...nel.org, pbonzini@...hat.com,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>, msuchanek@...e.de,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        kvm@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [linux-next PATCH] mm/gup.c: Convert to use get_user_{page|pages}_fast_only()

On Tue, May 26, 2020 at 1:29 PM Paul Mackerras <paulus@...abs.org> wrote:
>
> On Mon, May 25, 2020 at 02:23:32PM +0530, Souptick Joarder wrote:
> > API __get_user_pages_fast() renamed to get_user_pages_fast_only()
> > to align with pin_user_pages_fast_only().
> >
> > As part of this we will get rid of write parameter.
> > Instead caller will pass FOLL_WRITE to get_user_pages_fast_only().
> > This will not change any existing functionality of the API.
> >
> > All the callers are changed to pass FOLL_WRITE.
> >
> > Also introduce get_user_page_fast_only(), and use it in a few
> > places that hard-code nr_pages to 1.
> >
> > Updated the documentation of the API.
> >
> > Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
>
> The arch/powerpc/kvm bits look reasonable.
>
> Reviewed-by: Paul Mackerras <paulus@...abs.org>

Thanks Paul. This patch is merged through mm-tree.
https://lore.kernel.org/kvm/1590396812-31277-1-git-send-email-jrdr.linux@gmail.com/