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[PATCH] hugetlb: fix linked list corruption in unmap_hugepage_range()

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commit fe1668ae5b causes kernel to oops with
libhugetlbfs test suite.  The problem is that hugetlb pages can be shared
by multiple mappings.  Multiple threads can fight over page->lru in the
unmap path and bad things happen.  We now serialize __unmap_hugepage_range
to void concurrent linked list manipulation.  Such serialization is also
needed for shared page table page on hugetlb area.  This patch will fixed
the bug and also serve as a prepatch for shared page table.

Signed-off-by: Ken Chen <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: David Gibson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chen, Kenneth W 2006-10-11 01:20:46 -07:00 • committed by Linus Torvalds
commit 502717f4e1
3 changed files with 22 additions and 3 deletions
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2
fs/hugetlbfs/inode.c
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@ -293,7 +293,7 @@ hugetlb_vmtruncate_list(struct prio_tree_root *root, unsigned long h_pgoff)
if (h_vm_pgoff >= h_pgoff)
v_offset = 0;
unmap_hugepage_range(vma,
__unmap_hugepage_range(vma,
vma->vm_start + v_offset, vma->vm_end);
}
}