linux-kernel - Re: [PATCH 5.0 119/123] s390/mm: convert to the generic get_user_pages

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Date:   Thu, 23 May 2019 07:41:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Justin Forbes <jmforbes@...uxtx.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 5.0 119/123] s390/mm: convert to the generic
 get_user_pages_fast code

On Wed, May 22, 2019 at 04:46:16PM -0500, Justin Forbes wrote:
> On Mon, May 20, 2019 at 7:30 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > From: Martin Schwidefsky <schwidefsky@...ibm.com>
> >
> > commit 1a42010cdc26bb7e5912984f3c91b8c6d55f089a upstream.
> >
> > Define the gup_fast_permitted to check against the asce_limit of the
> > mm attached to the current task, then replace the s390 specific gup
> > code with the generic implementation in mm/gup.c.
> >
> > Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> While this code seems to work fine upstream, when backported to 5.0 it
> fails to build:
> 
> BUILDSTDERR: In file included from ./include/linux/mm.h:98,
> BUILDSTDERR:                  from mm/gup.c:6:
> BUILDSTDERR: mm/gup.c: In function '__get_user_pages_fast':
> BUILDSTDERR: ./arch/s390/include/asm/pgtable.h:1277:28: error: too
> many arguments to function 'gup_fast_permitted'
> BUILDSTDERR:  #define gup_fast_permitted gup_fast_permitted
> BUILDSTDERR:                             ^~~~~~~~~~~~~~~~~~
> BUILDSTDERR: mm/gup.c:1856:6: note: in expansion of macro 'gup_fast_permitted'
> BUILDSTDERR:   if (gup_fast_permitted(start, nr_pages, write)) {
> 
> It is missing upstream commit ad8cfb9c42ef83ecf4079bc7d77e6557648e952b
> mm/gup: Remove the 'write' parameter from gup_fast_permitted()

Oops, thanks for catching this.  I'll go queue this patch up now.

greg k-h