thp: consolidate code between handle_mm_fault() and do_huge_pmd_anonymous_page()

[karo-tx-linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d2d59b4149d06536d552d402cc872186f6f5ac74..8b6e55ee885576d3dc3613a23a990cd20da4bfed 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -115,6 +115,12 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_ARCH_1      0x01000000      /* Architecture-specific flag */
 #define VM_DONTDUMP    0x04000000      /* Do not include in the core dump */
 
+#ifdef CONFIG_MEM_SOFT_DIRTY
+# define VM_SOFTDIRTY  0x08000000      /* Not soft dirty clean area */
+#else
+# define VM_SOFTDIRTY  0
+#endif
+
 #define VM_MIXEDMAP    0x10000000      /* Can contain "struct page" and pure PFN pages */
 #define VM_HUGEPAGE    0x20000000      /* MADV_HUGEPAGE marked this vma */
 #define VM_NOHUGEPAGE  0x40000000      /* MADV_NOHUGEPAGE marked this vma */
@@ -170,6 +176,7 @@ extern pgprot_t protection_map[16];
 #define FAULT_FLAG_RETRY_NOWAIT        0x10    /* Don't drop mmap_sem and wait when retrying */
 #define FAULT_FLAG_KILLABLE    0x20    /* The fault task is in SIGKILL killable region */
 #define FAULT_FLAG_TRIED       0x40    /* second try */
+#define FAULT_FLAG_USER                0x80    /* The fault originated in userspace */
 
 /*
  * vm_fault is filled by the the pagefault handler and passed to the vma's
@@ -489,20 +496,6 @@ static inline int compound_order(struct page *page)
        return (unsigned long)page[1].lru.prev;
 }
 
-static inline int compound_trans_order(struct page *page)
-{
-       int order;
-       unsigned long flags;
-
-       if (!PageHead(page))
-               return 0;
-
-       flags = compound_lock_irqsave(page);
-       order = compound_order(page);
-       compound_unlock_irqrestore(page, flags);
-       return order;
-}
-
 static inline void set_compound_order(struct page *page, unsigned long order)
 {
        page[1].lru.prev = (void *)order;
@@ -637,12 +630,12 @@ static inline enum zone_type page_zonenum(const struct page *page)
 #endif
 
 /*
- * The identification function is only used by the buddy allocator for
- * determining if two pages could be buddies. We are not really
- * identifying a zone since we could be using a the section number
- * id if we have not node id available in page flags.
- * We guarantee only that it will return the same value for two
- * combinable pages in a zone.
+ * The identification function is mainly used by the buddy allocator for
+ * determining if two pages could be buddies. We are not really identifying
+ * the zone since we could be using the section number id if we do not have
+ * node id available in page flags.
+ * We only guarantee that it will return the same value for two combinable
+ * pages in a zone.
  */
 static inline int page_zone_id(struct page *page)
 {
@@ -884,11 +877,12 @@ static inline int page_mapped(struct page *page)
 #define VM_FAULT_NOPAGE        0x0100  /* ->fault installed the pte, not return page */
 #define VM_FAULT_LOCKED        0x0200  /* ->fault locked the returned page */
 #define VM_FAULT_RETRY 0x0400  /* ->fault blocked, must retry */
+#define VM_FAULT_FALLBACK 0x0800       /* huge page fault failed, fall back to small */
 
 #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */
 
 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \
-                        VM_FAULT_HWPOISON_LARGE)
+                        VM_FAULT_FALLBACK | VM_FAULT_HWPOISON_LARGE)
 
 /* Encode hstate index for a hwpoisoned large page */
 #define VM_FAULT_SET_HINDEX(x) ((x) << 12)
@@ -992,7 +986,7 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping,
        unmap_mapping_range(mapping, holebegin, holelen, 0);
 }
 
-extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new);
+extern void truncate_pagecache(struct inode *inode, loff_t new);
 extern void truncate_setsize(struct inode *inode, loff_t newsize);
 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
 int truncate_inode_page(struct address_space *mapping, struct page *page);