include/linux/hugetlb.h: convert to use vm_fault_t

kbuild produces the below warning:

  tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
  head:   223ae953687c7ea1b8f5f6bc9d8319a1a64c5ef6
  commit c8977e0d3d62 ("mm: create the new vm_fault_t type")
  reproduce:
        # apt-get install sparse
        git checkout c8977e0d3d6232ac8eb6a081732de586302d9b4d
        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 converts to return vm_fault_t type for hugetlb_fault() when
CONFIG_HUGETLB_PAGE=n.

Regarding the sparse warning, Luc said:

: This is the expected behaviour.  The constant 0 is magic regarding bitwise
: types but ({ ...; 0; }) is not, it is just an ordinary expression of type
: 'int'.
:
: So, IMHO, Souptick's patch is the right thing to do.

Link: http://lkml.kernel.org/r/20190318162604.GA31553@jordon-HP-15-Notebook-PC
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index ea35263eb76b76e796f2f3ffaa3378585b98db82..11943b60f2084cb5e69c6dd5553f2adf0ea4f8ca 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -203,7 +203,6 @@ static inline void hugetlb_show_meminfo(void)
 #define pud_huge(x)    0
 #define is_hugepage_only_range(mm, addr, len)  0
 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
-#define hugetlb_fault(mm, vma, addr, flags)    ({ BUG(); 0; })
 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
                                src_addr, pagep)        ({ BUG(); 0; })
 #define huge_pte_offset(mm, address, sz)       0
@@ -234,6 +233,13 @@ static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 {
        BUG();
 }
+static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
+                               struct vm_area_struct *vma, unsigned long address,
+                               unsigned int flags)
+{
+       BUG();
+       return 0;
+}
 
 #endif /* !CONFIG_HUGETLB_PAGE */
 /*