Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6

* 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6:
  hugetlb: add missing unlock in avoidcopy path in hugetlb_cow()
  hwpoison: rename CONFIG
  HWPOISON, hugetlb: support hwpoison injection for hugepage
  HWPOISON, hugetlb: detect hwpoison in hugetlb code
  HWPOISON, hugetlb: isolate corrupted hugepage
  HWPOISON, hugetlb: maintain mce_bad_pages in handling hugepage error
  HWPOISON, hugetlb: set/clear PG_hwpoison bits on hugepage
  HWPOISON, hugetlb: enable error handling path for hugepage
  hugetlb, rmap: add reverse mapping for hugepage
  hugetlb: move definition of is_vm_hugetlb_page() to hugepage_inline.h

Fix up trivial conflicts in mm/memory-failure.c

5 files changed, 39 insertions, 20 deletions

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 78b4bc64c006..f479700df61b 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -2,6 +2,7 @@
 #define _LINUX_HUGETLB_H
 
 #include <linux/fs.h>
+#include <linux/hugetlb_inline.h>
 
 struct ctl_table;
 struct user_struct;
@@ -14,11 +15,6 @@ struct user_struct;
 
 int PageHuge(struct page *page);
 
-static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
-{
-        return vma->vm_flags & VM_HUGETLB;
-}
-
 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
@@ -47,6 +43,7 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to,
                                                 struct vm_area_struct *vma,
                                                 int acctflags);
 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
+void __isolate_hwpoisoned_huge_page(struct page *page);
 
 extern unsigned long hugepages_treat_as_movable;
 extern const unsigned long hugetlb_zero, hugetlb_infinity;
@@ -77,11 +74,6 @@ static inline int PageHuge(struct page *page)
         return 0;
 }
 
-static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
-{
-        return 0;
-}
-
 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 {
 }
@@ -108,6 +100,8 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
 #define is_hugepage_only_range(mm, addr, len)   0
 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
+#define huge_pte_offset(mm, address)    0
+#define __isolate_hwpoisoned_huge_page(page)    0
 
 #define hugetlb_change_protection(vma, address, end, newprot)
 
diff --git a/include/linux/hugetlb_inline.h b/include/linux/hugetlb_inline.h
new file mode 100644
index 000000000000..6931489a5c14
--- /dev/null
+++ b/include/linux/hugetlb_inline.h
@@ -0,0 +1,22 @@
+#ifndef _LINUX_HUGETLB_INLINE_H
+#define _LINUX_HUGETLB_INLINE_H
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+#include <linux/mm.h>
+
+static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
+{
+        return vma->vm_flags & VM_HUGETLB;
+}
+
+#else
+
+static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
+{
+        return 0;
+}
+
+#endif
+
+#endif
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 78a702ce4fcb..e12cdc6d79ee 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -13,6 +13,7 @@
 #include <linux/gfp.h>
 #include <linux/bitops.h>
 #include <linux/hardirq.h> /* for in_interrupt() */
+#include <linux/hugetlb_inline.h>
 
 /*
  * Bits in mapping->flags.  The lower __GFP_BITS_SHIFT bits are the page
@@ -281,10 +282,16 @@ static inline loff_t page_offset(struct page *page)
         return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
 }
 
+extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
+                                     unsigned long address);
+
 static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
                                         unsigned long address)
 {
-        pgoff_t pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
+        pgoff_t pgoff;
+        if (unlikely(is_vm_hugetlb_page(vma)))
+                return linear_hugepage_index(vma, address);
+        pgoff = (address - vma->vm_start) >> PAGE_SHIFT;
         pgoff += vma->vm_pgoff;
         return pgoff >> (PAGE_CACHE_SHIFT - PAGE_SHIFT);
 }
diff --git a/include/linux/poison.h b/include/linux/poison.h
index 34066ffd893d..2110a81c5e2a 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -48,15 +48,6 @@
 #define POISON_FREE     0x6b    /* for use-after-free poisoning */
 #define POISON_END      0xa5    /* end-byte of poisoning */
 
-/********** mm/hugetlb.c **********/
-/*
- * Private mappings of hugetlb pages use this poisoned value for
- * page->mapping. The core VM should not be doing anything with this mapping
- * but futex requires the existence of some page->mapping value even though it
- * is unused if PAGE_MAPPING_ANON is set.
- */
-#define HUGETLB_POISON  ((void *)(0x00300300 + POISON_POINTER_DELTA + PAGE_MAPPING_ANON))
-
 /********** arch/$ARCH/mm/init.c **********/
 #define POISON_FREE_INITMEM     0xcc
 
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index d6661de56f30..31b2fd75dcba 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -168,6 +168,11 @@ void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned lon
 void page_add_file_rmap(struct page *);
 void page_remove_rmap(struct page *);
 
+void hugepage_add_anon_rmap(struct page *, struct vm_area_struct *,
+                            unsigned long);
+void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *,
+                                unsigned long);
+
 static inline void page_dup_rmap(struct page *page)
 {
         atomic_inc(&page->_mapcount);