linux-kernel - Re: [PATCH] mm: Change return type to vm_fault

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Date:   Wed, 30 May 2018 04:16:02 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>, Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        zi.yan@...rutgers.edu,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>, riel@...hat.com,
        pasha.tatashin@...cle.com, jschoenh@...zon.de,
        Kate Stewart <kstewart@...uxfoundation.org>,
        David Rientjes <rientjes@...gle.com>, tglx@...utronix.de,
        Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>, yang.s@...baba-inc.com,
        Minchan Kim <minchan@...nel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH] mm: Change return type to vm_fault_t

On Wed, May 30, 2018 at 09:10:47AM +0530, Souptick Joarder wrote:
> On Tue, May 29, 2018 at 11:04 PM, Matthew Wilcox <willy@...radead.org> wrote:
> > I see:
> >
> > mm/gup.c:817:15: warning: invalid assignment: |=
> > mm/gup.c:817:15:    left side has type int
> > mm/gup.c:817:15:    right side has type restricted vm_fault_t
> >
> > are you building with 'c=2' or 'C=2'?
> 
> Building with C=2.
> Do I need to enable any separate FLAG ?

Nope.  Here's what I have:

willy@...o:~/kernel/souptick$ make C=2 mm/gup.o
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CHECK   arch/x86/purgatory/purgatory.c
  CHECK   arch/x86/purgatory/sha256.c
  CHECK   arch/x86/purgatory/string.c
arch/x86/purgatory/../boot/string.c:134:6: warning: symbol 'simple_strtol' was not declared. Should it be static?
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  DESCEND  objtool
  CHECK   scripts/mod/empty.c
  CHK     scripts/mod/devicetable-offsets.h
  CHECK   mm/gup.c
mm/gup.c:817:15: warning: invalid assignment: |=
mm/gup.c:817:15:    left side has type int
mm/gup.c:817:15:    right side has type restricted vm_fault_t
  CC      mm/gup.o