Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:
 "The first part of the s390 updates for 4.14:

   - Add machine type 0x3906 for IBM z14

   - Add IBM z14 TLB flushing improvements for KVM guests

   - Exploit the TOD clock epoch extension to provide a continuous TOD
     clock afer 2042/09/17

   - Add NIAI spinlock hints for IBM z14

   - Rework the vmcp driver and use CMA for the respone buffer of z/VM
     CP commands

   - Drop some s390 specific asm headers and use the generic version

   - Add block discard for DASD-FBA devices under z/VM

   - Add average request times to DASD statistics

   - A few of those constify patches which seem to be in vogue right now

   - Cleanup and bug fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (50 commits)
  s390/mm: avoid empty zero pages for KVM guests to avoid postcopy hangs
  s390/dasd: Add discard support for FBA devices
  s390/zcrypt: make CPRBX const
  s390/uaccess: avoid mvcos jump label
  s390/mm: use generic mm_hooks
  s390/facilities: fix typo
  s390/vmcp: simplify vmcp_response_free()
  s390/topology: Remove the unused parent_node() macro
  s390/dasd: Change unsigned long long to unsigned long
  s390/smp: convert cpuhp_setup_state() return code to zero on success
  s390: fix 'novx' early parameter handling
  s390/dasd: add average request times to dasd statistics
  s390/scm: use common completion path
  s390/pci: log changes to uid checking
  s390/vmcp: simplify vmcp_ioctl()
  s390/vmcp: return -ENOTTY for unknown ioctl commands
  s390/vmcp: split vmcp header file and move to uapi
  s390/vmcp: make use of contiguous memory allocator
  s390/cpcmd,vmcp: avoid GFP_DMA allocations
  s390/vmcp: fix uaccess check and avoid undefined behavior
  ...

1 files changed, 26 insertions, 12 deletions

diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index b3bd3f23b8e8..4ea9106417ee 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -15,8 +15,30 @@
 #include <asm/mmu_context.h>
 #include <asm/facility.h>
 
+#ifndef CONFIG_HAVE_MARCH_Z10_FEATURES
 static DEFINE_STATIC_KEY_FALSE(have_mvcos);
 
+static int __init uaccess_init(void)
+{
+	if (test_facility(27))
+		static_branch_enable(&have_mvcos);
+	return 0;
+}
+early_initcall(uaccess_init);
+
+static inline int copy_with_mvcos(void)
+{
+	if (static_branch_likely(&have_mvcos))
+		return 1;
+	return 0;
+}
+#else
+static inline int copy_with_mvcos(void)
+{
+	return 1;
+}
+#endif
+
 static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr,
 						 unsigned long size)
 {
@@ -84,7 +106,7 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
 
 unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 {
-	if (static_branch_likely(&have_mvcos))
+	if (copy_with_mvcos())
 		return copy_from_user_mvcos(to, from, n);
 	return copy_from_user_mvcp(to, from, n);
 }
@@ -157,7 +179,7 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
 
 unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 {
-	if (static_branch_likely(&have_mvcos))
+	if (copy_with_mvcos())
 		return copy_to_user_mvcos(to, from, n);
 	return copy_to_user_mvcs(to, from, n);
 }
@@ -220,7 +242,7 @@ static inline unsigned long copy_in_user_mvc(void __user *to, const void __user
 
 unsigned long raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
 {
-	if (static_branch_likely(&have_mvcos))
+	if (copy_with_mvcos())
 		return copy_in_user_mvcos(to, from, n);
 	return copy_in_user_mvc(to, from, n);
 }
@@ -292,7 +314,7 @@ static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
 
 unsigned long __clear_user(void __user *to, unsigned long size)
 {
-	if (static_branch_likely(&have_mvcos))
+	if (copy_with_mvcos())
 			return clear_user_mvcos(to, size);
 	return clear_user_xc(to, size);
 }
@@ -349,11 +371,3 @@ long __strncpy_from_user(char *dst, const char __user *src, long size)
 	return done;
 }
 EXPORT_SYMBOL(__strncpy_from_user);
-
-static int __init uaccess_init(void)
-{
-	if (test_facility(27))
-		static_branch_enable(&have_mvcos);
-	return 0;
-}
-early_initcall(uaccess_init);