diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 76989b878f3c..4820a02838ac 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -3,49 +3,38 @@
 
 config TILE
 	def_bool y
-	select HAVE_EXIT_THREAD
-	select HAVE_PERF_EVENTS
-	select USE_PMC if PERF_EVENTS
-	select HAVE_DMA_API_DEBUG
-	select HAVE_KVM if !TILEGX
-	select GENERIC_FIND_FIRST_BIT
-	select SYSCTL_EXCEPTION_TRACE
-	select CC_OPTIMIZE_FOR_SIZE
-	select HAVE_DEBUG_KMEMLEAK
-	select GENERIC_IRQ_PROBE
-	select GENERIC_PENDING_IRQ if SMP
-	select GENERIC_IRQ_SHOW
-	select HAVE_DEBUG_BUGVERBOSE
-	select VIRT_TO_BUS
-	select SYS_HYPERVISOR
+	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 	select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
-	select GENERIC_CLOCKEVENTS
-	select MODULES_USE_ELF_RELA
-	select HAVE_ARCH_TRACEHOOK
-	select HAVE_SYSCALL_TRACEPOINTS
-	select USER_STACKTRACE_SUPPORT
-	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
-	select HAVE_DEBUG_STACKOVERFLOW
 	select ARCH_WANT_FRAME_POINTERS
-	select HAVE_CONTEXT_TRACKING
-	select HAVE_NMI if USE_PMC
+	select CC_OPTIMIZE_FOR_SIZE
 	select EDAC_SUPPORT
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_FIND_FIRST_BIT
+	select GENERIC_IRQ_PROBE
+	select GENERIC_IRQ_SHOW
+	select GENERIC_PENDING_IRQ if SMP
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
 	select HAVE_ARCH_SECCOMP_FILTER
-
-# FIXME: investigate whether we need/want these options.
-#	select HAVE_IOREMAP_PROT
-#	select HAVE_OPTPROBES
-#	select HAVE_REGS_AND_STACK_ACCESS_API
-#	select HAVE_HW_BREAKPOINT
-#	select PERF_EVENTS
-#	select HAVE_USER_RETURN_NOTIFIER
-#	config NO_BOOTMEM
-#	config ARCH_SUPPORTS_DEBUG_PAGEALLOC
-#	config HUGETLB_PAGE_SIZE_VARIABLE
+	select HAVE_ARCH_TRACEHOOK
+	select HAVE_CONTEXT_TRACKING
+	select HAVE_DEBUG_BUGVERBOSE
+	select HAVE_DEBUG_KMEMLEAK
+	select HAVE_DEBUG_STACKOVERFLOW
+	select HAVE_DMA_API_DEBUG
+	select HAVE_EXIT_THREAD
+	select HAVE_KVM if !TILEGX
+	select HAVE_NMI if USE_PMC
+	select HAVE_PERF_EVENTS
+	select HAVE_SYSCALL_TRACEPOINTS
+	select MODULES_USE_ELF_RELA
+	select SYSCTL_EXCEPTION_TRACE
+	select SYS_HYPERVISOR
+	select USER_STACKTRACE_SUPPORT
+	select USE_PMC if PERF_EVENTS
+	select VIRT_TO_BUS
 
 config MMU
 	def_bool y
@@ -132,17 +121,17 @@ config HVC_TILE
 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 config TILEGX
 	def_bool ARCH != "tilepro"
-	select SPARSE_IRQ
+	select ARCH_SUPPORTS_ATOMIC_RMW
 	select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
-	select HAVE_FUNCTION_TRACER
-	select HAVE_FUNCTION_GRAPH_TRACER
+	select HAVE_ARCH_JUMP_LABEL
+	select HAVE_ARCH_KGDB
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FTRACE_MCOUNT_RECORD
+	select HAVE_FUNCTION_GRAPH_TRACER
+	select HAVE_FUNCTION_TRACER
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
-	select HAVE_ARCH_KGDB
-	select ARCH_SUPPORTS_ATOMIC_RMW
-	select HAVE_ARCH_JUMP_LABEL
+	select SPARSE_IRQ
 
 config TILEPRO
 	def_bool !TILEGX
diff --git a/arch/tile/configs/tilegx_defconfig b/arch/tile/configs/tilegx_defconfig
index 718905557f7e..dea47c31ab16 100644
--- a/arch/tile/configs/tilegx_defconfig
+++ b/arch/tile/configs/tilegx_defconfig
@@ -89,7 +89,6 @@ CONFIG_TCP_CONG_YEAH=m
 CONFIG_TCP_CONG_ILLINOIS=m
 CONFIG_TCP_MD5SIG=y
 CONFIG_IPV6=y
-CONFIG_IPV6_PRIVACY=y
 CONFIG_IPV6_ROUTER_PREF=y
 CONFIG_IPV6_ROUTE_INFO=y
 CONFIG_IPV6_OPTIMISTIC_DAD=y
diff --git a/arch/tile/configs/tilepro_defconfig b/arch/tile/configs/tilepro_defconfig
index dc85468afd5e..95743eedf747 100644
--- a/arch/tile/configs/tilepro_defconfig
+++ b/arch/tile/configs/tilepro_defconfig
@@ -85,7 +85,6 @@ CONFIG_TCP_CONG_YEAH=m
 CONFIG_TCP_CONG_ILLINOIS=m
 CONFIG_TCP_MD5SIG=y
 CONFIG_IPV6=y
-CONFIG_IPV6_PRIVACY=y
 CONFIG_IPV6_ROUTER_PREF=y
 CONFIG_IPV6_ROUTE_INFO=y
 CONFIG_IPV6_OPTIMISTIC_DAD=y
diff --git a/arch/tile/gxio/mpipe.c b/arch/tile/gxio/mpipe.c
index f102048d9c0e..34de300ab320 100644
--- a/arch/tile/gxio/mpipe.c
+++ b/arch/tile/gxio/mpipe.c
@@ -122,7 +122,7 @@ size_t gxio_mpipe_calc_buffer_stack_bytes(unsigned long buffers)
 {
 	const int BUFFERS_PER_LINE = 12;
 
-	/* Count the number of cachlines. */
+	/* Count the number of cachelines. */
 	unsigned long lines =
 		(buffers + BUFFERS_PER_LINE - 1) / BUFFERS_PER_LINE;
 
diff --git a/arch/tile/include/asm/atomic_64.h b/arch/tile/include/asm/atomic_64.h
index 51cabc26e387..b0531a623653 100644
--- a/arch/tile/include/asm/atomic_64.h
+++ b/arch/tile/include/asm/atomic_64.h
@@ -37,12 +37,25 @@ static inline void atomic_add(int i, atomic_t *v)
 	__insn_fetchadd4((void *)&v->counter, i);
 }
 
+/*
+ * Note a subtlety of the locking here.  We are required to provide a
+ * full memory barrier before and after the operation.  However, we
+ * only provide an explicit mb before the operation.  After the
+ * operation, we use barrier() to get a full mb for free, because:
+ *
+ * (1) The barrier directive to the compiler prohibits any instructions
+ * being statically hoisted before the barrier;
+ * (2) the microarchitecture will not issue any further instructions
+ * until the fetchadd result is available for the "+ i" add instruction;
+ * (3) the smb_mb before the fetchadd ensures that no other memory
+ * operations are in flight at this point.
+ */
 static inline int atomic_add_return(int i, atomic_t *v)
 {
 	int val;
 	smp_mb();  /* barrier for proper semantics */
 	val = __insn_fetchadd4((void *)&v->counter, i) + i;
-	barrier();  /* the "+ i" above will wait on memory */
+	barrier();  /* equivalent to smp_mb(); see block comment above */
 	return val;
 }
 
@@ -95,7 +108,7 @@ static inline long atomic64_add_return(long i, atomic64_t *v)
 	int val;
 	smp_mb();  /* barrier for proper semantics */
 	val = __insn_fetchadd((void *)&v->counter, i) + i;
-	barrier();  /* the "+ i" above will wait on memory */
+	barrier();  /* equivalent to smp_mb; see atomic_add_return() */
 	return val;
 }
 
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
index aa2b44cd8fd3..0e7a5d09e023 100644
--- a/arch/tile/kernel/pci_gx.c
+++ b/arch/tile/kernel/pci_gx.c
@@ -40,7 +40,7 @@
 #include <arch/sim.h>
 
 /*
- * This file containes the routines to search for PCI buses,
+ * This file contains the routines to search for PCI buses,
  * enumerate the buses, and configure any attached devices.
  */
 
@@ -434,7 +434,7 @@ int __init tile_pci_init(void)
 
 	/*
 	 * Now determine which PCIe ports are configured to operate in RC
-	 * mode. There is a differece in the port configuration capability
+	 * mode. There is a difference in the port configuration capability
 	 * between the Gx36 and Gx72 devices.
 	 *
 	 * The Gx36 has configuration capability for each of the 3 PCIe
diff --git a/arch/tile/kernel/unaligned.c b/arch/tile/kernel/unaligned.c
index 0db5f7c9d9e5..9772a3554282 100644
--- a/arch/tile/kernel/unaligned.c
+++ b/arch/tile/kernel/unaligned.c
@@ -188,7 +188,7 @@ static void find_regs(tilegx_bundle_bits bundle, uint64_t *rd, uint64_t *ra,
 	 * Parse fault bundle, find potential used registers and mark
 	 * corresponding bits in reg_map and alias_map. These 2 bit maps
 	 * are used to find the scratch registers and determine if there
-	 * is register alais.
+	 * is register alias.
 	 */
 	if (bundle & TILEGX_BUNDLE_MODE_MASK) {  /* Y Mode Bundle. */
 
@@ -1529,7 +1529,7 @@ void do_unaligned(struct pt_regs *regs, int vecnum)
 	}
 
 
-	/* Read the bundle casued the exception! */
+	/* Read the bundle caused the exception! */
 	pc = (tilegx_bundle_bits __user *)(regs->pc);
 	if (get_user(bundle, pc) != 0) {
 		/* Probably never be here since pc is valid user address.*/