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 17:59:04 +1000
From:   Paul Mackerras <paulus@...abs.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     mpe@...erman.id.au, benh@...nel.crashing.org,
        akpm@...ux-foundation.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, pbonzini@...hat.com, sfr@...b.auug.org.au,
        rppt@...ux.ibm.com, 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@...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 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>