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

Pull s390 patches from Martin Schwidefsky:
 "An update to the oops output with additional information about the
  crash.  The renameat2 system call is enabled.  Two patches in regard
  to the PTR_ERR_OR_ZERO cleanup.  And a bunch of bug fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/sclp_cmd: replace PTR_RET with PTR_ERR_OR_ZERO
  s390/sclp: replace PTR_RET with PTR_ERR_OR_ZERO
  s390/sclp_vt220: Fix kernel panic due to early terminal input
  s390/compat: fix typo
  s390/uaccess: fix possible register corruption in strnlen_user_srst()
  s390: add 31 bit warning message
  s390: wire up sys_renameat2
  s390: show_registers() should not map user space addresses to kernel symbols
  s390/mm: print control registers and page table walk on crash
  s390/smp: fix smp_stop_cpu() for !CONFIG_SMP
  s390: fix control register update

14 files changed, 223 insertions, 36 deletions

diff --git a/arch/s390/include/asm/sigp.h b/arch/s390/include/asm/sigp.h
index d091aa1aaf11..bf9c823d4020 100644
--- a/arch/s390/include/asm/sigp.h
+++ b/arch/s390/include/asm/sigp.h
@@ -31,4 +31,23 @@
 #define SIGP_STATUS_INCORRECT_STATE     0x00000200UL
 #define SIGP_STATUS_NOT_RUNNING         0x00000400UL
 
+#ifndef __ASSEMBLY__
+
+static inline int __pcpu_sigp(u16 addr, u8 order, u32 parm, u32 *status)
+{
+        register unsigned int reg1 asm ("1") = parm;
+        int cc;
+
+        asm volatile(
+                "       sigp    %1,%2,0(%3)\n"
+                "       ipm     %0\n"
+                "       srl     %0,28\n"
+                : "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc");
+        if (status && cc == 1)
+                *status = reg1;
+        return cc;
+}
+
+#endif /* __ASSEMBLY__ */
+
 #endif /* __S390_ASM_SIGP_H */
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
index 160779394096..21703f85b48d 100644
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -7,6 +7,8 @@
 #ifndef __ASM_SMP_H
 #define __ASM_SMP_H
 
+#include <asm/sigp.h>
+
 #ifdef CONFIG_SMP
 
 #include <asm/lowcore.h>
@@ -50,9 +52,18 @@ static inline int smp_store_status(int cpu) { return 0; }
 static inline int smp_vcpu_scheduled(int cpu) { return 1; }
 static inline void smp_yield_cpu(int cpu) { }
 static inline void smp_yield(void) { }
-static inline void smp_stop_cpu(void) { }
 static inline void smp_fill_possible_mask(void) { }
 
+static inline void smp_stop_cpu(void)
+{
+        u16 pcpu = stap();
+
+        for (;;) {
+                __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
+                cpu_relax();
+        }
+}
+
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/s390/include/uapi/asm/unistd.h b/arch/s390/include/uapi/asm/unistd.h
index 5eb5c9ddb120..3802d2d3a18d 100644
--- a/arch/s390/include/uapi/asm/unistd.h
+++ b/arch/s390/include/uapi/asm/unistd.h
@@ -282,7 +282,8 @@
 #define __NR_finit_module       344
 #define __NR_sched_setattr      345
 #define __NR_sched_getattr      346
-#define NR_syscalls 345
+#define __NR_renameat2          347
+#define NR_syscalls 348
 
 /* 
  * There are some system calls that are not present on 64 bit, some
diff --git a/arch/s390/kernel/compat_wrapper.c b/arch/s390/kernel/compat_wrapper.c
index 824c39dfddfc..45cdb37aa6f8 100644
--- a/arch/s390/kernel/compat_wrapper.c
+++ b/arch/s390/kernel/compat_wrapper.c
@@ -1,5 +1,5 @@
 /*
- *  Compat sytem call wrappers.
+ *  Compat system call wrappers.
  *
  *    Copyright IBM Corp. 2014
  */
@@ -213,3 +213,4 @@ COMPAT_SYSCALL_WRAP5(kcmp, pid_t, pid1, pid_t, pid2, int, type, unsigned long, i
 COMPAT_SYSCALL_WRAP3(finit_module, int, fd, const char __user *, uargs, int, flags);
 COMPAT_SYSCALL_WRAP3(sched_setattr, pid_t, pid, struct sched_attr __user *, attr, unsigned int, flags);
 COMPAT_SYSCALL_WRAP4(sched_getattr, pid_t, pid, struct sched_attr __user *, attr, unsigned int, size, unsigned int, flags);
+COMPAT_SYSCALL_WRAP5(renameat2, int, olddfd, const char __user *, oldname, int, newdfd, const char __user *, newname, unsigned int, flags);
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index e6af9406987c..acb412442e5e 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -144,10 +144,10 @@ void show_registers(struct pt_regs *regs)
         char *mode;
 
         mode = user_mode(regs) ? "User" : "Krnl";
-        printk("%s PSW : %p %p (%pSR)\n",
-               mode, (void *) regs->psw.mask,
-               (void *) regs->psw.addr,
-               (void *) regs->psw.addr);
+        printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
+        if (!user_mode(regs))
+                printk(" (%pSR)", (void *)regs->psw.addr);
+        printk("\n");
         printk("           R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
                "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
                mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 4ac8fafec95f..1c82619eb4f7 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -64,7 +64,7 @@ void update_cr_regs(struct task_struct *task)
                 if (task->thread.per_flags & PER_FLAG_NO_TE)
                         cr_new &= ~(1UL << 55);
                 if (cr_new != cr)
-                        __ctl_load(cr, 0, 0);
+                        __ctl_load(cr_new, 0, 0);
                 /* Set or clear transaction execution TDC bits 62 and 63. */
                 __ctl_store(cr, 2, 2);
                 cr_new = cr & ~3UL;
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index f70f2489fa5f..88d1ca81e2dd 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -1027,3 +1027,35 @@ void __init setup_arch(char **cmdline_p)
         /* Setup zfcpdump support */
         setup_zfcpdump();
 }
+
+#ifdef CONFIG_32BIT
+static int no_removal_warning __initdata;
+
+static int __init parse_no_removal_warning(char *str)
+{
+        no_removal_warning = 1;
+        return 0;
+}
+__setup("no_removal_warning", parse_no_removal_warning);
+
+static int __init removal_warning(void)
+{
+        if (no_removal_warning)
+                return 0;
+        printk(KERN_ALERT "\n\n");
+        printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
+        printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
+        printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
+        printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
+        printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
+        printk(KERN_CONT "please let us know. Please write to:\n");
+        printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
+        printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
+        printk(KERN_CONT "Thank you!\n\n");
+        printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
+        printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
+        schedule_timeout_uninterruptible(300 * HZ);
+        return 0;
+}
+early_initcall(removal_warning);
+#endif
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 512ce1cde2a4..86e65ec3422b 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -82,21 +82,6 @@ DEFINE_MUTEX(smp_cpu_state_mutex);
 /*
  * Signal processor helper functions.
  */
-static inline int __pcpu_sigp(u16 addr, u8 order, u32 parm, u32 *status)
-{
-        register unsigned int reg1 asm ("1") = parm;
-        int cc;
-
-        asm volatile(
-                "       sigp    %1,%2,0(%3)\n"
-                "       ipm     %0\n"
-                "       srl     %0,28\n"
-                : "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc");
-        if (status && cc == 1)
-                *status = reg1;
-        return cc;
-}
-
 static inline int __pcpu_sigp_relax(u16 addr, u8 order, u32 parm, u32 *status)
 {
         int cc;
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index 542ef488bac1..fe5cdf29a001 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -355,3 +355,4 @@ SYSCALL(sys_kcmp,sys_kcmp,compat_sys_kcmp)
 SYSCALL(sys_finit_module,sys_finit_module,compat_sys_finit_module)
 SYSCALL(sys_sched_setattr,sys_sched_setattr,compat_sys_sched_setattr) /* 345 */
 SYSCALL(sys_sched_getattr,sys_sched_getattr,compat_sys_sched_getattr)
+SYSCALL(sys_renameat2,sys_renameat2,compat_sys_renameat2)
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index 23f866b4c7f1..7416efe8eae4 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -338,9 +338,6 @@ static inline unsigned long strnlen_user_srst(const char __user *src,
         register unsigned long reg0 asm("0") = 0;
         unsigned long tmp1, tmp2;
 
-        if (unlikely(!size))
-                return 0;
-        update_primary_asce(current);
         asm volatile(
                 "   la    %2,0(%1)\n"
                 "   la    %3,0(%0,%1)\n"
@@ -359,6 +356,8 @@ static inline unsigned long strnlen_user_srst(const char __user *src,
 
 unsigned long __strnlen_user(const char __user *src, unsigned long size)
 {
+        if (unlikely(!size))
+                return 0;
         update_primary_asce(current);
         return strnlen_user_srst(src, size);
 }
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 19f623f1f21c..2f51a998a67e 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -126,6 +126,133 @@ static inline int user_space_fault(struct pt_regs *regs)
         return 0;
 }
 
+static int bad_address(void *p)
+{
+        unsigned long dummy;
+
+        return probe_kernel_address((unsigned long *)p, dummy);
+}
+
+#ifdef CONFIG_64BIT
+static void dump_pagetable(unsigned long asce, unsigned long address)
+{
+        unsigned long *table = __va(asce & PAGE_MASK);
+
+        pr_alert("AS:%016lx ", asce);
+        switch (asce & _ASCE_TYPE_MASK) {
+        case _ASCE_TYPE_REGION1:
+                table = table + ((address >> 53) & 0x7ff);
+                if (bad_address(table))
+                        goto bad;
+                pr_cont("R1:%016lx ", *table);
+                if (*table & _REGION_ENTRY_INVALID)
+                        goto out;
+                table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+                /* fallthrough */
+        case _ASCE_TYPE_REGION2:
+                table = table + ((address >> 42) & 0x7ff);
+                if (bad_address(table))
+                        goto bad;
+                pr_cont("R2:%016lx ", *table);
+                if (*table & _REGION_ENTRY_INVALID)
+                        goto out;
+                table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+                /* fallthrough */
+        case _ASCE_TYPE_REGION3:
+                table = table + ((address >> 31) & 0x7ff);
+                if (bad_address(table))
+                        goto bad;
+                pr_cont("R3:%016lx ", *table);
+                if (*table & (_REGION_ENTRY_INVALID | _REGION3_ENTRY_LARGE))
+                        goto out;
+                table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+                /* fallthrough */
+        case _ASCE_TYPE_SEGMENT:
+                table = table + ((address >> 20) & 0x7ff);
+                if (bad_address(table))
+                        goto bad;
+                pr_cont(KERN_CONT "S:%016lx ", *table);
+                if (*table & (_SEGMENT_ENTRY_INVALID | _SEGMENT_ENTRY_LARGE))
+                        goto out;
+                table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
+        }
+        table = table + ((address >> 12) & 0xff);
+        if (bad_address(table))
+                goto bad;
+        pr_cont("P:%016lx ", *table);
+out:
+        pr_cont("\n");
+        return;
+bad:
+        pr_cont("BAD\n");
+}
+
+#else /* CONFIG_64BIT */
+
+static void dump_pagetable(unsigned long asce, unsigned long address)
+{
+        unsigned long *table = __va(asce & PAGE_MASK);
+
+        pr_alert("AS:%08lx ", asce);
+        table = table + ((address >> 20) & 0x7ff);
+        if (bad_address(table))
+                goto bad;
+        pr_cont("S:%08lx ", *table);
+        if (*table & _SEGMENT_ENTRY_INVALID)
+                goto out;
+        table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
+        table = table + ((address >> 12) & 0xff);
+        if (bad_address(table))
+                goto bad;
+        pr_cont("P:%08lx ", *table);
+out:
+        pr_cont("\n");
+        return;
+bad:
+        pr_cont("BAD\n");
+}
+
+#endif /* CONFIG_64BIT */
+
+static void dump_fault_info(struct pt_regs *regs)
+{
+        unsigned long asce;
+
+        pr_alert("Fault in ");
+        switch (regs->int_parm_long & 3) {
+        case 3:
+                pr_cont("home space ");
+                break;
+        case 2:
+                pr_cont("secondary space ");
+                break;
+        case 1:
+                pr_cont("access register ");
+                break;
+        case 0:
+                pr_cont("primary space ");
+                break;
+        }
+        pr_cont("mode while using ");
+        if (!user_space_fault(regs)) {
+                asce = S390_lowcore.kernel_asce;
+                pr_cont("kernel ");
+        }
+#ifdef CONFIG_PGSTE
+        else if ((current->flags & PF_VCPU) && S390_lowcore.gmap) {
+                struct gmap *gmap = (struct gmap *)S390_lowcore.gmap;
+                asce = gmap->asce;
+                pr_cont("gmap ");
+        }
+#endif
+        else {
+                asce = S390_lowcore.user_asce;
+                pr_cont("user ");
+        }
+        pr_cont("ASCE.\n");
+        dump_pagetable(asce, regs->int_parm_long & __FAIL_ADDR_MASK);
+}
+
 static inline void report_user_fault(struct pt_regs *regs, long signr)
 {
         if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
@@ -138,8 +265,9 @@ static inline void report_user_fault(struct pt_regs *regs, long signr)
                regs->int_code);
         print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN);
         printk(KERN_CONT "\n");
-        printk(KERN_ALERT "failing address: %lX\n",
-               regs->int_parm_long & __FAIL_ADDR_MASK);
+        printk(KERN_ALERT "failing address: %016lx TEID: %016lx\n",
+               regs->int_parm_long & __FAIL_ADDR_MASK, regs->int_parm_long);
+        dump_fault_info(regs);
         show_regs(regs);
 }
 
@@ -177,11 +305,13 @@ static noinline void do_no_context(struct pt_regs *regs)
         address = regs->int_parm_long & __FAIL_ADDR_MASK;
         if (!user_space_fault(regs))
                 printk(KERN_ALERT "Unable to handle kernel pointer dereference"
-                       " at virtual kernel address %p\n", (void *)address);
+                       " in virtual kernel address space\n");
         else
                 printk(KERN_ALERT "Unable to handle kernel paging request"
-                       " at virtual user address %p\n", (void *)address);
-
+                       " in virtual user address space\n");
+        printk(KERN_ALERT "failing address: %016lx TEID: %016lx\n",
+               regs->int_parm_long & __FAIL_ADDR_MASK, regs->int_parm_long);
+        dump_fault_info(regs);
         die(regs, "Oops");
         do_exit(SIGKILL);
 }
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 1990285296c6..c316051d9bda 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -1252,7 +1252,7 @@ static __init int sclp_initcall(void)
                 return rc;
 
         sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0);
-        rc = PTR_RET(sclp_pdev);
+        rc = PTR_ERR_OR_ZERO(sclp_pdev);
         if (rc)
                 goto fail_platform_driver_unregister;
 
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 6e8f90f84e49..6e14999f9e8f 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -515,7 +515,7 @@ static int __init sclp_detect_standby_memory(void)
         if (rc)
                 goto out;
         sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
-        rc = PTR_RET(sclp_pdev);
+        rc = PTR_ERR_OR_ZERO(sclp_pdev);
         if (rc)
                 goto out_driver;
         sclp_add_standby_memory();
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index 4eed38cd0af6..cd9c91909596 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/drivers/s390/char/sclp_vt220.c
@@ -97,13 +97,16 @@ static void sclp_vt220_pm_event_fn(struct sclp_register *reg,
 static int __sclp_vt220_emit(struct sclp_vt220_request *request);
 static void sclp_vt220_emit_current(void);
 
-/* Registration structure for our interest in SCLP event buffers */
+/* Registration structure for SCLP output event buffers */
 static struct sclp_register sclp_vt220_register = {
         .send_mask              = EVTYP_VT220MSG_MASK,
+        .pm_event_fn            = sclp_vt220_pm_event_fn,
+};
+
+/* Registration structure for SCLP input event buffers */
+static struct sclp_register sclp_vt220_register_input = {
         .receive_mask           = EVTYP_VT220MSG_MASK,
-        .state_change_fn        = NULL,
         .receiver_fn            = sclp_vt220_receiver_fn,
-        .pm_event_fn            = sclp_vt220_pm_event_fn,
 };
 
 
@@ -715,9 +718,14 @@ static int __init sclp_vt220_tty_init(void)
         rc = tty_register_driver(driver);
         if (rc)
                 goto out_init;
+        rc = sclp_register(&sclp_vt220_register_input);
+        if (rc)
+                goto out_reg;
         sclp_vt220_driver = driver;
         return 0;
 
+out_reg:
+        tty_unregister_driver(driver);
 out_init:
         __sclp_vt220_cleanup();
 out_driver: