linux-kernel - Re: mm/memory.c:3968:21: sparse: incorrect type in assignment (different base types)

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Date:   Thu, 14 Mar 2019 09:00:52 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org,
        William Kucharski <william.kucharski@...cle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: mm/memory.c:3968:21: sparse: incorrect type in assignment
 (different base types)

On Thu, Mar 14, 2019 at 03:10:19PM +0530, Souptick Joarder wrote:
> > >> 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
> 
> Looking into https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> hugetlb_fault() is converted to return vm_fault_t. Not sure, why sparse is
> still throwing warnings.

Because there are two definitions of hugetlb_fault():

$ git grep -wn hugetlb_fault
include/linux/hugetlb.h:108:vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
include/linux/hugetlb.h:206:#define hugetlb_fault(mm, vma, addr, flags) ({ BUG(); 0; })