Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

Pull MIPS updates from Ralf Baechle:

 - Improvements to the tlb_dump code
 - KVM fixes
 - Add support for appended DTB
 - Minor improvements to the R12000 support
 - Minor improvements to the R12000 support
 - Various platform improvments for BCM47xx
 - The usual pile of minor cleanups
 - A number of BPF fixes and improvments
 - Some improvments to the support for R3000 and DECstations
 - Some improvments to the ATH79 platform support
 - A major patchset for the JZ4740 SOC adding support for the CI20 platform
 - Add support for the Pistachio SOC
 - Minor BMIPS/BCM63xx platform support improvments.
 - Avoid "SYNC 0" as memory barrier when unlocking spinlocks
 - Add support for the XWR-1750 board.
 - Paul's __cpuinit/__cpuinitdata cleanups.
 - New Malta CPU board support large memory so enable ZONE_DMA32.

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (131 commits)
  MIPS: spinlock: Adjust arch_spin_lock back-off time
  MIPS: asmmacro: Ensure 64-bit FP registers are used with MSA
  MIPS: BCM47xx: Simplify handling SPROM revisions
  MIPS: Cobalt Don't use module_init in non-modular MTD registration.
  MIPS: BCM47xx: Move NVRAM driver to the drivers/firmware/
  MIPS: use for_each_sg()
  MIPS: BCM47xx: Don't select BCMA_HOST_PCI
  MIPS: BCM47xx: Add helper variable for storing NVRAM length
  MIPS: IRQ/IP27: Move IRQ allocation API to platform code.
  MIPS: Replace smp_mb with release barrier function in unlocks.
  MIPS: i8259: DT support
  MIPS: Malta: Basic DT plumbing
  MIPS: include errno.h for ENODEV in mips-cm.h
  MIPS: Define GCR_GIC_STATUS register fields
  MIPS: BPF: Introduce BPF ASM helpers
  MIPS: BPF: Use BPF register names to describe the ABI
  MIPS: BPF: Move register definition to the BPF header
  MIPS: net: BPF: Replace RSIZE with SZREG
  MIPS: BPF: Free up some callee-saved registers
  MIPS: Xtalk: Update xwidget.h with known Xtalk device numbers
  ...

1 files changed, 31 insertions, 16 deletions

diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index 9722357d2854..5305d694ffe5 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -78,6 +78,21 @@ extern u64 __ua_limit;
 
 #define segment_eq(a, b)	((a).seg == (b).seg)
 
+/*
+ * eva_kernel_access() - determine whether kernel memory access on an EVA system
+ *
+ * Determines whether memory accesses should be performed to kernel memory
+ * on a system using Extended Virtual Addressing (EVA).
+ *
+ * Return: true if a kernel memory access on an EVA system, else false.
+ */
+static inline bool eva_kernel_access(void)
+{
+	if (!config_enabled(CONFIG_EVA))
+		return false;
+
+	return segment_eq(get_fs(), get_ds());
+}
 
 /*
  * Is a address valid? This does a straighforward calculation rather
@@ -286,7 +301,7 @@ do {									\
 ({									\
 	int __gu_err;							\
 									\
-	if (segment_eq(get_fs(), get_ds())) {				\
+	if (eva_kernel_access()) {					\
 		__get_kernel_common((x), size, ptr);			\
 	} else {							\
 		__chk_user_ptr(ptr);					\
@@ -302,7 +317,7 @@ do {									\
 									\
 	might_fault();							\
 	if (likely(access_ok(VERIFY_READ,  __gu_ptr, size))) {		\
-		if (segment_eq(get_fs(), get_ds()))			\
+		if (eva_kernel_access())				\
 			__get_kernel_common((x), size, __gu_ptr);	\
 		else							\
 			__get_user_common((x), size, __gu_ptr);		\
@@ -427,7 +442,7 @@ do {									\
 	int __pu_err = 0;						\
 									\
 	__pu_val = (x);							\
-	if (segment_eq(get_fs(), get_ds())) {				\
+	if (eva_kernel_access()) {					\
 		__put_kernel_common(ptr, size);				\
 	} else {							\
 		__chk_user_ptr(ptr);					\
@@ -444,7 +459,7 @@ do {									\
 									\
 	might_fault();							\
 	if (likely(access_ok(VERIFY_WRITE,  __pu_addr, size))) {	\
-		if (segment_eq(get_fs(), get_ds()))			\
+		if (eva_kernel_access())				\
 			__put_kernel_common(__pu_addr, size);		\
 		else							\
 			__put_user_common(__pu_addr, size);		\
@@ -843,7 +858,7 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
 	__cu_from = (from);						\
 	__cu_len = (n);							\
 	might_fault();							\
-	if (segment_eq(get_fs(), get_ds()))				\
+	if (eva_kernel_access())					\
 		__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from,	\
 						   __cu_len);		\
 	else								\
@@ -863,7 +878,7 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
 	__cu_to = (to);							\
 	__cu_from = (from);						\
 	__cu_len = (n);							\
-	if (segment_eq(get_fs(), get_ds()))				\
+	if (eva_kernel_access())					\
 		__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from,	\
 						   __cu_len);		\
 	else								\
@@ -881,7 +896,7 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
 	__cu_to = (to);							\
 	__cu_from = (from);						\
 	__cu_len = (n);							\
-	if (segment_eq(get_fs(), get_ds()))				\
+	if (eva_kernel_access())					\
 		__cu_len = __invoke_copy_from_kernel_inatomic(__cu_to,	\
 							      __cu_from,\
 							      __cu_len);\
@@ -915,7 +930,7 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
 	__cu_to = (to);							\
 	__cu_from = (from);						\
 	__cu_len = (n);							\
-	if (segment_eq(get_fs(), get_ds())) {				\
+	if (eva_kernel_access()) {					\
 		__cu_len = __invoke_copy_to_kernel(__cu_to,		\
 						   __cu_from,		\
 						   __cu_len);		\
@@ -1139,7 +1154,7 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
 	__cu_to = (to);							\
 	__cu_from = (from);						\
 	__cu_len = (n);							\
-	if (segment_eq(get_fs(), get_ds())) {				\
+	if (eva_kernel_access()) {					\
 		__cu_len = __invoke_copy_from_kernel(__cu_to,		\
 						     __cu_from,		\
 						     __cu_len);		\
@@ -1163,7 +1178,7 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
 	__cu_to = (to);							\
 	__cu_from = (from);						\
 	__cu_len = (n);							\
-	if (segment_eq(get_fs(), get_ds())) {				\
+	if (eva_kernel_access()) {					\
 		__cu_len = ___invoke_copy_in_kernel(__cu_to, __cu_from,	\
 						    __cu_len);		\
 	} else {							\
@@ -1183,7 +1198,7 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
 	__cu_to = (to);							\
 	__cu_from = (from);						\
 	__cu_len = (n);							\
-	if (segment_eq(get_fs(), get_ds())) {				\
+	if (eva_kernel_access()) {					\
 		__cu_len = ___invoke_copy_in_kernel(__cu_to,__cu_from,	\
 						    __cu_len);		\
 	} else {							\
@@ -1263,7 +1278,7 @@ __strncpy_from_user(char *__to, const char __user *__from, long __len)
 {
 	long res;
 
-	if (segment_eq(get_fs(), get_ds())) {
+	if (eva_kernel_access()) {
 		__asm__ __volatile__(
 			"move\t$4, %1\n\t"
 			"move\t$5, %2\n\t"
@@ -1312,7 +1327,7 @@ strncpy_from_user(char *__to, const char __user *__from, long __len)
 {
 	long res;
 
-	if (segment_eq(get_fs(), get_ds())) {
+	if (eva_kernel_access()) {
 		__asm__ __volatile__(
 			"move\t$4, %1\n\t"
 			"move\t$5, %2\n\t"
@@ -1357,7 +1372,7 @@ static inline long strlen_user(const char __user *s)
 {
 	long res;
 
-	if (segment_eq(get_fs(), get_ds())) {
+	if (eva_kernel_access()) {
 		__asm__ __volatile__(
 			"move\t$4, %1\n\t"
 			__MODULE_JAL(__strlen_kernel_asm)
@@ -1384,7 +1399,7 @@ static inline long __strnlen_user(const char __user *s, long n)
 {
 	long res;
 
-	if (segment_eq(get_fs(), get_ds())) {
+	if (eva_kernel_access()) {
 		__asm__ __volatile__(
 			"move\t$4, %1\n\t"
 			"move\t$5, %2\n\t"
@@ -1426,7 +1441,7 @@ static inline long strnlen_user(const char __user *s, long n)
 	long res;
 
 	might_fault();
-	if (segment_eq(get_fs(), get_ds())) {
+	if (eva_kernel_access()) {
 		__asm__ __volatile__(
 			"move\t$4, %1\n\t"
 			"move\t$5, %2\n\t"