linux-kernel - Re: [PATCH] include/linux/hugetlb.h: Convert to use vm_fault

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Date:   Tue, 19 Mar 2019 08:04:19 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] include/linux/hugetlb.h: Convert to use vm_fault_t

On Tue, Mar 19, 2019 at 5:47 AM Mike Kravetz <mike.kravetz@...cle.com> wrote:
>
>
> On 3/18/19 9:26 AM, Souptick Joarder wrote:
> > kbuild produces the below warning ->
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   5453a3df2a5eb49bc24615d4cf0d66b2aae05e5f
> > commit 3d3539018d2c ("mm: create the new vm_fault_t type")
> > reproduce:
> >         # apt-get install sparse
> >         git checkout 3d3539018d2cbd12e5af4a132636ee7fd8d43ef0
> >         make ARCH=x86_64 allmodconfig
> >         make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
> >
> >>> mm/memory.c:3968:21: sparse: incorrect type in assignment (different
> >>> base types) @@    expected restricted vm_fault_t [usertype] ret @@
> >>> got e] ret @@
> >    mm/memory.c:3968:21:    expected restricted vm_fault_t [usertype] ret
> >    mm/memory.c:3968:21:    got int
> >
> > This patch will convert to return vm_fault_t type for hugetlb_fault()
> > when CONFIG_HUGETLB_PAGE =n.
> >
> > Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
>
> Thanks for fixing this.
>
> The BUG() here and in several other places in this file is unnecessary
> and IMO should be cleaned up.  But that is beyond the scope of this fix.
> Added to my to do list.

I can clean it up if you are fine ;-)
>
> Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
> --
> Mike Kravetz