The patch titled
Subject: mm: fix vm_fault_t cast in VM_FAULT_GET_HINDEX()
has been added to the -mm tree. Its filename is
mm-fix-vm_fault_t-cast-in-vm_fault_get_hindex.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fix-vm_fault_t-cast-in-vm_fault_get_hindex.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fix-vm_fault_t-cast-in-vm_fault_get_hindex.patch
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------------------------------------------------------
From: Jann Horn <jannh@xxxxxxxxxx>
Subject: mm: fix vm_fault_t cast in VM_FAULT_GET_HINDEX()
Symmetrically to VM_FAULT_SET_HINDEX(), we need a force-cast in
VM_FAULT_GET_HINDEX() to tell sparse that this is intentional.
Sparse complains about the current code when building a kernel with
CONFIG_MEMORY_FAILURE:
arch/x86/mm/fault.c:1058:53: warning: restricted vm_fault_t degrades to
integer
Link: http://lkml.kernel.org/r/20190327204117.35215-1-jannh@xxxxxxxxxx
Fixes: 3d3539018d2c ("mm: create the new vm_fault_t type")
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm_types.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/mm_types.h~mm-fix-vm_fault_t-cast-in-vm_fault_get_hindex
+++ a/include/linux/mm_types.h
@@ -671,7 +671,7 @@ enum vm_fault_reason {
/* Encode hstate index for a hwpoisoned large page */
#define VM_FAULT_SET_HINDEX(x) ((__force vm_fault_t)((x) << 16))
-#define VM_FAULT_GET_HINDEX(x) (((x) >> 16) & 0xf)
+#define VM_FAULT_GET_HINDEX(x) (((__force unsigned int)(x) >> 16) & 0xf)
#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | \
VM_FAULT_SIGSEGV | VM_FAULT_HWPOISON | \
_
Patches currently in -mm which might be from jannh@xxxxxxxxxx are
mm-fix-vm_fault_t-cast-in-vm_fault_get_hindex.patch
