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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:07:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:07:52 -0700
commit3e42dee676e8cf5adca817b1518b2e99d1c138ff (patch)
tree23580fe97d1e452667b507c2aadb99877d0b574c /mm/hugetlb.c
parent42daabf62bfa3c00974b43f030dadcf704c0db59 (diff)
parent88c8004fd3a5fdd2378069de86b90b21110d33a4 (diff)
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking changes from Ingo Molnar: "Four miscellanous standalone fixes for futexes, rtmutexes and Kconfig.locks." * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: futex: Use freezable blocking call futex: Take hugepages into account when generating futex_key rtmutex: Document rt_mutex_adjust_prio_chain() locking: Fix copy/paste errors of "ARCH_INLINE_*_UNLOCK_BH"
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e2bfbf73a55..5cf99bf8cce 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -690,6 +690,23 @@ int PageHuge(struct page *page)
}
EXPORT_SYMBOL_GPL(PageHuge);
+pgoff_t __basepage_index(struct page *page)
+{
+ struct page *page_head = compound_head(page);
+ pgoff_t index = page_index(page_head);
+ unsigned long compound_idx;
+
+ if (!PageHuge(page_head))
+ return page_index(page);
+
+ if (compound_order(page_head) >= MAX_ORDER)
+ compound_idx = page_to_pfn(page) - page_to_pfn(page_head);
+ else
+ compound_idx = page - page_head;
+
+ return (index << compound_order(page_head)) + compound_idx;
+}
+
static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
{
struct page *page;