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

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Date:   Mon, 18 Mar 2019 17:17:44 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Souptick Joarder <jrdr.linux@...il.com>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        willy@...radead.org
Subject: Re: [PATCH] include/linux/hugetlb.h: Convert to use vm_fault_t


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.

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz