4 files changed, 9 insertions, 5 deletions
diff --git a/include/asm-generic/5level-fixup.h b/include/asm-generic/5level-fixup.h
index dfbd9d990637..9c2e0708eb82 100644
--- a/include/asm-generic/5level-fixup.h
+++ b/include/asm-generic/5level-fixup.h
@@ -8,6 +8,7 @@
 #define P4D_SHIFT			PGDIR_SHIFT
 #define P4D_SIZE			PGDIR_SIZE
 #define P4D_MASK			PGDIR_MASK
+#define MAX_PTRS_PER_P4D		1
 #define PTRS_PER_P4D			1
 
 #define p4d_t				pgd_t
diff --git a/include/asm-generic/bitops/lock.h b/include/asm-generic/bitops/lock.h
index bc397573c43a..67ab280ad134 100644
--- a/include/asm-generic/bitops/lock.h
+++ b/include/asm-generic/bitops/lock.h
@@ -7,7 +7,8 @@
  * @nr: Bit to set
  * @addr: Address to count from
  *
- * This operation is atomic and provides acquire barrier semantics.
+ * This operation is atomic and provides acquire barrier semantics if
+ * the returned value is 0.
  * It can be used to implement bit locks.
  */
 #define test_and_set_bit_lock(nr, addr)	test_and_set_bit(nr, addr)
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 963b755d19b0..a7613e1b0c87 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -52,6 +52,7 @@ struct bug_entry {
 #ifndef HAVE_ARCH_BUG
 #define BUG() do { \
 	printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
+	barrier_before_unreachable(); \
 	panic("BUG!"); \
 } while (0)
 #endif
diff --git a/include/asm-generic/pgtable-nop4d.h b/include/asm-generic/pgtable-nop4d.h
index 8f22f55de17a..1a29b2a0282b 100644
--- a/include/asm-generic/pgtable-nop4d.h
+++ b/include/asm-generic/pgtable-nop4d.h
@@ -8,10 +8,11 @@
 
 typedef struct { pgd_t pgd; } p4d_t;
 
-#define P4D_SHIFT	PGDIR_SHIFT
-#define PTRS_PER_P4D	1
-#define P4D_SIZE	(1UL << P4D_SHIFT)
-#define P4D_MASK	(~(P4D_SIZE-1))
+#define P4D_SHIFT		PGDIR_SHIFT
+#define MAX_PTRS_PER_P4D	1
+#define PTRS_PER_P4D		1
+#define P4D_SIZE		(1UL << P4D_SHIFT)
+#define P4D_MASK		(~(P4D_SIZE-1))
 
 /*
  * The "pgd_xxx()" functions here are trivial for a folded two-level