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authorChen, Kenneth W <kenneth.w.chen@intel.com>2006-10-11 01:20:46 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-11 11:14:15 -0700
commit502717f4e112b18d9c37753a32f675bec9f2838b (patch)
tree90e674229bbd7caa05e740dfe719cf8749d0eb27 /include/linux/hugetlb.h
parent97c7801cd5b0bb6a38c16108a496235474dc6310 (diff)
downloadop-kernel-dev-502717f4e112b18d9c37753a32f675bec9f2838b.zip
op-kernel-dev-502717f4e112b18d9c37753a32f675bec9f2838b.tar.gz
[PATCH] hugetlb: fix linked list corruption in unmap_hugepage_range()
commit fe1668ae5bf0145014c71797febd9ad5670d5d05 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 <kenneth.w.chen@intel.com> Cc: Hugh Dickins <hugh@veritas.com> Cc: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/hugetlb.h')
-rw-r--r--include/linux/hugetlb.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index c25a38d..5081d27 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -17,6 +17,7 @@ int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int);
void unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
+void __unmap_hugepage_range(struct vm_area_struct *, unsigned long, unsigned long);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
int hugetlb_report_meminfo(char *);
int hugetlb_report_node_meminfo(int, char *);
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