David Gibson wrote on Tuesday, October 25, 2005 7:49 PM

+int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
+		  unsigned long address, int write_access)
+{
+	pte_t *ptep;
+	pte_t entry;
+
+	ptep = huge_pte_alloc(mm, address);
+	if (! ptep)
+		/* OOM */
+		return VM_FAULT_SIGBUS;
+
+	entry = *ptep;
+
+	if (pte_none(entry))
+		return hugetlb_no_page(mm, vma, address, ptep);
+
+	/* we could get here if another thread instantiated the pte
+	 * before the test above */
+
+	return VM_FAULT_SIGBUS;
 }

Are you sure about the last return?  Looks like a typo to me, if *ptep
is present, it should return VM_FAULT_MINOR.

But the bigger question is: don't you need some lock when checking *ptep?

- Ken

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