[PATCHv2, RFC 22/30] mm: add huge_fault() callback to vm_operations_struct

[Kirill A. Shutemov]

From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>

huge_fault() should try to setup huge page for the pgoff, if possbile.
VM_FAULT_OOM return code means we need to fallback to small pages.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 include/linux/mm.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index df83ab9..5456294 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -195,6 +195,7 @@ struct vm_operations_struct {
 	void (*open)(struct vm_area_struct * area);
 	void (*close)(struct vm_area_struct * area);
 	int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
+	int (*huge_fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
 
 	/* notification that a previously read-only page is about to become
 	 * writable, if an error is returned it will cause a SIGBUS */
-- 
1.7.10.4

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