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

Pull s390 fixes from Martin Schwidefsky:

 - convert the debug feature to refcount_t

 - reduce the copy size for strncpy_from_user

 - 8 bug fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/virtio: change virtio_feature_desc:features type to __le32
  s390: convert debug_info.ref_count from atomic_t to refcount_t
  s390: move _text symbol to address higher than zero
  s390/qdio: increase string buffer size
  s390/ccwgroup: increase string buffer size
  s390/topology: let topology_mnest_limit() return unsigned char
  s390/uaccess: use sane length for __strncpy_from_user()
  s390/uprobes: fix compile for !KPROBES
  s390/ftrace: fix compile for !MODULES
  s390/cputime: fix incorrect system time

13 files changed, 55 insertions, 26 deletions

diff --git a/arch/s390/include/asm/debug.h b/arch/s390/include/asm/debug.h
index 0206c8052328..df7b54ea956d 100644
--- a/arch/s390/include/asm/debug.h
+++ b/arch/s390/include/asm/debug.h
@@ -10,6 +10,7 @@
 #include <linux/spinlock.h>
 #include <linux/kernel.h>
 #include <linux/time.h>
+#include <linux/refcount.h>
 #include <uapi/asm/debug.h>
 
 #define DEBUG_MAX_LEVEL            6  /* debug levels range from 0 to 6 */
@@ -31,7 +32,7 @@ struct debug_view;
 typedef struct debug_info {     
         struct debug_info* next;
         struct debug_info* prev;
-        atomic_t ref_count;
+        refcount_t ref_count;
         spinlock_t lock;                        
         int level;
         int nr_areas;
diff --git a/arch/s390/include/asm/dis.h b/arch/s390/include/asm/dis.h
index 60323c21938b..37f617dfbede 100644
--- a/arch/s390/include/asm/dis.h
+++ b/arch/s390/include/asm/dis.h
@@ -40,6 +40,8 @@ static inline int insn_length(unsigned char code)
         return ((((int) code + 64) >> 7) + 1) << 1;
 }
 
+struct pt_regs;
+
 void show_code(struct pt_regs *regs);
 void print_fn_code(unsigned char *code, unsigned long len);
 int insn_to_mnemonic(unsigned char *instruction, char *buf, unsigned int len);
diff --git a/arch/s390/include/asm/kprobes.h b/arch/s390/include/asm/kprobes.h
index 1293c4066cfc..28792ef82c83 100644
--- a/arch/s390/include/asm/kprobes.h
+++ b/arch/s390/include/asm/kprobes.h
@@ -27,12 +27,21 @@
  * 2005-Dec     Used as a template for s390 by Mike Grundy
  *              <grundym@us.ibm.com>
  */
+#include <linux/types.h>
 #include <asm-generic/kprobes.h>
 
 #define BREAKPOINT_INSTRUCTION  0x0002
 
+#define FIXUP_PSW_NORMAL        0x08
+#define FIXUP_BRANCH_NOT_TAKEN  0x04
+#define FIXUP_RETURN_REGISTER   0x02
+#define FIXUP_NOT_REQUIRED      0x01
+
+int probe_is_prohibited_opcode(u16 *insn);
+int probe_get_fixup_type(u16 *insn);
+int probe_is_insn_relative_long(u16 *insn);
+
 #ifdef CONFIG_KPROBES
-#include <linux/types.h>
 #include <linux/ptrace.h>
 #include <linux/percpu.h>
 #include <linux/sched/task_stack.h>
@@ -56,11 +65,6 @@ typedef u16 kprobe_opcode_t;
 
 #define KPROBE_SWAP_INST        0x10
 
-#define FIXUP_PSW_NORMAL        0x08
-#define FIXUP_BRANCH_NOT_TAKEN  0x04
-#define FIXUP_RETURN_REGISTER   0x02
-#define FIXUP_NOT_REQUIRED      0x01
-
 /* Architecture specific copy of original instruction */
 struct arch_specific_insn {
         /* copy of original instruction */
@@ -90,10 +94,6 @@ int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 int kprobe_exceptions_notify(struct notifier_block *self,
         unsigned long val, void *data);
 
-int probe_is_prohibited_opcode(u16 *insn);
-int probe_get_fixup_type(u16 *insn);
-int probe_is_insn_relative_long(u16 *insn);
-
 #define flush_insn_slot(p)      do { } while (0)
 
 #endif /* CONFIG_KPROBES */
diff --git a/arch/s390/include/asm/sysinfo.h b/arch/s390/include/asm/sysinfo.h
index 73bff45ced55..e784bed6ed7f 100644
--- a/arch/s390/include/asm/sysinfo.h
+++ b/arch/s390/include/asm/sysinfo.h
@@ -146,7 +146,7 @@ extern int topology_max_mnest;
  * Returns the maximum nesting level supported by the cpu topology code.
  * The current maximum level is 4 which is the drawer level.
  */
-static inline int topology_mnest_limit(void)
+static inline unsigned char topology_mnest_limit(void)
 {
         return min(topology_max_mnest, 4);
 }
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index 530226b6cb19..86b3e74f569e 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -277,7 +277,7 @@ debug_info_alloc(const char *name, int pages_per_area, int nr_areas,
         memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
         memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
                 sizeof(struct dentry*));
-        atomic_set(&(rc->ref_count), 0);
+        refcount_set(&(rc->ref_count), 0);
 
         return rc;
 
@@ -361,7 +361,7 @@ debug_info_create(const char *name, int pages_per_area, int nr_areas,
         debug_area_last = rc;
         rc->next = NULL;
 
-        debug_info_get(rc);
+        refcount_set(&rc->ref_count, 1);
 out:
         return rc;
 }
@@ -416,7 +416,7 @@ static void
 debug_info_get(debug_info_t * db_info)
 {
         if (db_info)
-                atomic_inc(&db_info->ref_count);
+                refcount_inc(&db_info->ref_count);
 }
 
 /*
@@ -431,7 +431,7 @@ debug_info_put(debug_info_t *db_info)
 
         if (!db_info)
                 return;
-        if (atomic_dec_and_test(&db_info->ref_count)) {
+        if (refcount_dec_and_test(&db_info->ref_count)) {
                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
                         if (!db_info->views[i])
                                 continue;
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index a5f5d3bb3dbc..e408d9cc5b96 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -312,6 +312,7 @@ ENTRY(system_call)
         lg      %r14,__LC_VDSO_PER_CPU
         lmg     %r0,%r10,__PT_R0(%r11)
         mvc     __LC_RETURN_PSW(16),__PT_PSW(%r11)
+.Lsysc_exit_timer:
         stpt    __LC_EXIT_TIMER
         mvc     __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
         lmg     %r11,%r15,__PT_R11(%r11)
@@ -623,6 +624,7 @@ ENTRY(io_int_handler)
         lg      %r14,__LC_VDSO_PER_CPU
         lmg     %r0,%r10,__PT_R0(%r11)
         mvc     __LC_RETURN_PSW(16),__PT_PSW(%r11)
+.Lio_exit_timer:
         stpt    __LC_EXIT_TIMER
         mvc     __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
         lmg     %r11,%r15,__PT_R11(%r11)
@@ -1174,15 +1176,23 @@ cleanup_critical:
         br      %r14
 
 .Lcleanup_sysc_restore:
+        # check if stpt has been executed
         clg     %r9,BASED(.Lcleanup_sysc_restore_insn)
+        jh      0f
+        mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
+        cghi    %r11,__LC_SAVE_AREA_ASYNC
         je      0f
+        mvc     __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
+0:      clg     %r9,BASED(.Lcleanup_sysc_restore_insn+8)
+        je      1f
         lg      %r9,24(%r11)            # get saved pointer to pt_regs
         mvc     __LC_RETURN_PSW(16),__PT_PSW(%r9)
         mvc     0(64,%r11),__PT_R8(%r9)
         lmg     %r0,%r7,__PT_R0(%r9)
-0:      lmg     %r8,%r9,__LC_RETURN_PSW
+1:      lmg     %r8,%r9,__LC_RETURN_PSW
         br      %r14
 .Lcleanup_sysc_restore_insn:
+        .quad   .Lsysc_exit_timer
         .quad   .Lsysc_done - 4
 
 .Lcleanup_io_tif:
@@ -1190,15 +1200,20 @@ cleanup_critical:
         br      %r14
 
 .Lcleanup_io_restore:
+        # check if stpt has been executed
         clg     %r9,BASED(.Lcleanup_io_restore_insn)
-        je      0f
+        jh      0f
+        mvc     __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER
+0:      clg     %r9,BASED(.Lcleanup_io_restore_insn+8)
+        je      1f
         lg      %r9,24(%r11)            # get saved r11 pointer to pt_regs
         mvc     __LC_RETURN_PSW(16),__PT_PSW(%r9)
         mvc     0(64,%r11),__PT_R8(%r9)
         lmg     %r0,%r7,__PT_R0(%r9)
-0:      lmg     %r8,%r9,__LC_RETURN_PSW
+1:      lmg     %r8,%r9,__LC_RETURN_PSW
         br      %r14
 .Lcleanup_io_restore_insn:
+        .quad   .Lio_exit_timer
         .quad   .Lio_done - 4
 
 .Lcleanup_idle:
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 27477f34cc0a..d03a6d12c4bd 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -173,6 +173,8 @@ int __init ftrace_dyn_arch_init(void)
         return 0;
 }
 
+#ifdef CONFIG_MODULES
+
 static int __init ftrace_plt_init(void)
 {
         unsigned int *ip;
@@ -191,6 +193,8 @@ static int __init ftrace_plt_init(void)
 }
 device_initcall(ftrace_plt_init);
 
+#endif /* CONFIG_MODULES */
+
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 /*
  * Hook the return address and push it in the stack of return addresses
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index 72307f108c40..6e2c42bd1c3b 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -31,8 +31,14 @@ SECTIONS
 {
         . = 0x00000000;
         .text : {
-        _text = .;              /* Text and read-only data */
+                /* Text and read-only data */
                 HEAD_TEXT
+                /*
+                 * E.g. perf doesn't like symbols starting at address zero,
+                 * therefore skip the initial PSW and channel program located
+                 * at address zero and let _text start at 0x200.
+                 */
+        _text = 0x200;
                 TEXT_TEXT
                 SCHED_TEXT
                 CPUIDLE_TEXT
diff --git a/arch/s390/lib/probes.c b/arch/s390/lib/probes.c
index ae90e1ae3607..1963ddbf4ab3 100644
--- a/arch/s390/lib/probes.c
+++ b/arch/s390/lib/probes.c
@@ -4,6 +4,7 @@
  *    Copyright IBM Corp. 2014
  */
 
+#include <linux/errno.h>
 #include <asm/kprobes.h>
 #include <asm/dis.h>
 
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 1e5bb2b86c42..b3bd3f23b8e8 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -337,8 +337,8 @@ long __strncpy_from_user(char *dst, const char __user *src, long size)
                 return 0;
         done = 0;
         do {
-                offset = (size_t)src & ~PAGE_MASK;
-                len = min(size - done, PAGE_SIZE - offset);
+                offset = (size_t)src & (L1_CACHE_BYTES - 1);
+                len = min(size - done, L1_CACHE_BYTES - offset);
                 if (copy_from_user(dst, src, len))
                         return -EFAULT;
                 len_str = strnlen(dst, len);
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index e443b0d0b236..34b9ad6b3143 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -35,7 +35,7 @@ static struct bus_type ccwgroup_bus_type;
 static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
 {
         int i;
-        char str[8];
+        char str[16];
 
         for (i = 0; i < gdev->count; i++) {
                 sprintf(str, "cdev%d", i);
@@ -238,7 +238,7 @@ static void ccwgroup_release(struct device *dev)
 
 static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
 {
-        char str[8];
+        char str[16];
         int i, rc;
 
         for (i = 0; i < gdev->count; i++) {
diff --git a/drivers/s390/cio/qdio_debug.h b/drivers/s390/cio/qdio_debug.h
index f33ce8577619..1d595d17bf11 100644
--- a/drivers/s390/cio/qdio_debug.h
+++ b/drivers/s390/cio/qdio_debug.h
@@ -11,7 +11,7 @@
 #include "qdio.h"
 
 /* that gives us 15 characters in the text event views */
-#define QDIO_DBF_LEN    16
+#define QDIO_DBF_LEN    32
 
 extern debug_info_t *qdio_dbf_setup;
 extern debug_info_t *qdio_dbf_error;
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 2a76ea78a0bf..b18fe2014cf2 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -87,7 +87,7 @@ struct vq_info_block {
 } __packed;
 
 struct virtio_feature_desc {
-        __u32 features;
+        __le32 features;
         __u8 index;
 } __packed;