thp: compound_lock

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 57e11b2a18ba6ff6668925c28b0eb8310e4689de..3b1754ad8785cb4dfe9910de1757927c06729203 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -14,6 +14,7 @@
 #include <linux/mm_types.h>
 #include <linux/range.h>
 #include <linux/pfn.h>
+#include <linux/bit_spinlock.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -305,6 +306,39 @@ static inline int is_vmalloc_or_module_addr(const void *x)
 }
 #endif
 
+static inline void compound_lock(struct page *page)
+{
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+       bit_spin_lock(PG_compound_lock, &page->flags);
+#endif
+}
+
+static inline void compound_unlock(struct page *page)
+{
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+       bit_spin_unlock(PG_compound_lock, &page->flags);
+#endif
+}
+
+static inline unsigned long compound_lock_irqsave(struct page *page)
+{
+       unsigned long uninitialized_var(flags);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+       local_irq_save(flags);
+       compound_lock(page);
+#endif
+       return flags;
+}
+
+static inline void compound_unlock_irqrestore(struct page *page,
+                                             unsigned long flags)
+{
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+       compound_unlock(page);
+       local_irq_restore(flags);
+#endif
+}
+
 static inline struct page *compound_head(struct page *page)
 {
        if (unlikely(PageTail(page)))