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authorHugh Dickins <hugh@veritas.com>2005-10-20 16:24:28 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-20 09:02:07 -0700
commitac9b9c667c2e1194e22ebe0a441ae1c37aaa9b90 (patch)
tree3903d87d0b56a49ead39c0460b5bc0b86b040775 /mm/hugetlb.c
parent93918e9afc76717176e9e114e79cdbb602a45ae8 (diff)
downloadop-kernel-dev-ac9b9c667c2e1194e22ebe0a441ae1c37aaa9b90.zip
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[PATCH] Fix handling spurious page fault for hugetlb region
This reverts commit 3359b54c8c07338f3a863d1109b42eebccdcf379 and replaces it with a cleaner version that is purely based on page table operations, so that the synchronization between inode size and hugetlb mappings becomes moot. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index a1b30d4..61d3806 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -394,6 +394,28 @@ out:
return ret;
}
+/*
+ * On ia64 at least, it is possible to receive a hugetlb fault from a
+ * stale zero entry left in the TLB from earlier hardware prefetching.
+ * Low-level arch code should already have flushed the stale entry as
+ * part of its fault handling, but we do need to accept this minor fault
+ * and return successfully. Whereas the "normal" case is that this is
+ * an access to a hugetlb page which has been truncated off since mmap.
+ */
+int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long address, int write_access)
+{
+ int ret = VM_FAULT_SIGBUS;
+ pte_t *pte;
+
+ spin_lock(&mm->page_table_lock);
+ pte = huge_pte_offset(mm, address);
+ if (pte && !pte_none(*pte))
+ ret = VM_FAULT_MINOR;
+ spin_unlock(&mm->page_table_lock);
+ return ret;
+}
+
int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, int *length, int i)
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