[PATCH] Handle spurious page fault for hugetlb region

[cascardo/linux.git] / include / linux / hugetlb.h

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index e670b0d..42cb7d7 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -155,11 +155,24 @@ static inline void set_file_hugepages(struct file *file)
 {
        file->f_op = &hugetlbfs_file_operations;
 }
+
+static inline int valid_hugetlb_file_off(struct vm_area_struct *vma, 
+                                         unsigned long address) 
+{
+       struct inode *inode = vma->vm_file->f_dentry->d_inode;
+       loff_t file_off = address - vma->vm_start;
+       
+       file_off += (vma->vm_pgoff << PAGE_SHIFT);
+       
+       return (file_off < inode->i_size);
+}
+
 #else /* !CONFIG_HUGETLBFS */
 
 #define is_file_hugepages(file)                0
 #define set_file_hugepages(file)       BUG()
 #define hugetlb_zero_setup(size)       ERR_PTR(-ENOSYS)
+#define valid_hugetlb_file_off(vma, address)   0
 
 #endif /* !CONFIG_HUGETLBFS */