The patch titled
Subject: include/linux/hugetlb.h: convert to use vm_fault_t
has been added to the -mm tree. Its filename is
include-linux-hugetlbh-convert-to-use-vm_fault_t.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/include-linux-hugetlbh-convert-to-use-vm_fault_t.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/include-linux-hugetlbh-convert-to-use-vm_fault_t.patch
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------------------------------------------------------
From: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Subject: 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: 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 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@xxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/hugetlb.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/include/linux/hugetlb.h~include-linux-hugetlbh-convert-to-use-vm_fault_t
+++ a/include/linux/hugetlb.h
@@ -203,7 +203,6 @@ static inline void hugetlb_show_meminfo(
#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_rang
{
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 */
/*
_
Patches currently in -mm which might be from jrdr.linux@xxxxxxxxx are
include-linux-hugetlbh-convert-to-use-vm_fault_t.patch
