Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] Update default configuration.
  [S390] use generic sys_ptrace
  [S390] Remove self ptrace IEEE_IP hack.
  [S390] Convert to SPARSEMEM & SPARSEMEM_VMEMMAP
  [S390] System z large page support.
  [S390] Convert machine feature detection code to C.
  [S390] vmemmap: use clear_table to initialise page tables.
  [S390] Move stfl to system.h and delete duplicated version.
  [S390] uaccess_mvcos: #ifdef config dependent code.
  [S390] cpu topology: Fix possible deadlock.
  [S390] Add topology_core_siblings to topology.h
  [S390] cio: Make isc handling more robust.
  [S390] remove -traditional
  [S390] Automatically detect added cpus.
  [S390] smp: Fix locking order.
  [S390] Add missing ifndef/define to include/asm-s390/sysinfo.h.
  [S390] Move show_regs to traps.c.
  [S390] cio: Use strict_strtoul() for attributes.

10 files changed, 205 insertions, 235 deletions

diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 77051cd27925..6302f5082588 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -2,8 +2,6 @@
 # Makefile for the linux kernel.
 #
 
-EXTRA_AFLAGS    := -traditional
-
 #
 # Passing null pointers is ok for smp code, since we access the lowcore here.
 #
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 68ec4083bf73..d0e09684b9ce 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -139,15 +139,15 @@ static noinline __init void detect_machine_type(void)
 
         /* Running under z/VM ? */
         if (cpuinfo->cpu_id.version == 0xff)
-                machine_flags |= 1;
+                machine_flags |= MACHINE_FLAG_VM;
 
         /* Running on a P/390 ? */
         if (cpuinfo->cpu_id.machine == 0x7490)
-                machine_flags |= 4;
+                machine_flags |= MACHINE_FLAG_P390;
 
         /* Running under KVM ? */
         if (cpuinfo->cpu_id.version == 0xfe)
-                machine_flags |= 64;
+                machine_flags |= MACHINE_FLAG_KVM;
 }
 
 #ifdef CONFIG_64BIT
@@ -268,6 +268,118 @@ static noinline __init void setup_lowcore_early(void)
         s390_base_pgm_handler_fn = early_pgm_check_handler;
 }
 
+static noinline __init void setup_hpage(void)
+{
+#ifndef CONFIG_DEBUG_PAGEALLOC
+        unsigned int facilities;
+
+        facilities = stfl();
+        if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
+                return;
+        machine_flags |= MACHINE_FLAG_HPAGE;
+        __ctl_set_bit(0, 23);
+#endif
+}
+
+static __init void detect_mvpg(void)
+{
+#ifndef CONFIG_64BIT
+        int rc;
+
+        asm volatile(
+                "       la      0,0\n"
+                "       mvpg    %2,%2\n"
+                "0:     la      %0,0\n"
+                "1:\n"
+                EX_TABLE(0b,1b)
+                : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
+        if (!rc)
+                machine_flags |= MACHINE_FLAG_MVPG;
+#endif
+}
+
+static __init void detect_ieee(void)
+{
+#ifndef CONFIG_64BIT
+        int rc, tmp;
+
+        asm volatile(
+                "       efpc    %1,0\n"
+                "0:     la      %0,0\n"
+                "1:\n"
+                EX_TABLE(0b,1b)
+                : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
+        if (!rc)
+                machine_flags |= MACHINE_FLAG_IEEE;
+#endif
+}
+
+static __init void detect_csp(void)
+{
+#ifndef CONFIG_64BIT
+        int rc;
+
+        asm volatile(
+                "       la      0,0\n"
+                "       la      1,0\n"
+                "       la      2,4\n"
+                "       csp     0,2\n"
+                "0:     la      %0,0\n"
+                "1:\n"
+                EX_TABLE(0b,1b)
+                : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
+        if (!rc)
+                machine_flags |= MACHINE_FLAG_CSP;
+#endif
+}
+
+static __init void detect_diag9c(void)
+{
+        unsigned int cpu_address;
+        int rc;
+
+        cpu_address = stap();
+        asm volatile(
+                "       diag    %2,0,0x9c\n"
+                "0:     la      %0,0\n"
+                "1:\n"
+                EX_TABLE(0b,1b)
+                : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
+        if (!rc)
+                machine_flags |= MACHINE_FLAG_DIAG9C;
+}
+
+static __init void detect_diag44(void)
+{
+#ifdef CONFIG_64BIT
+        int rc;
+
+        asm volatile(
+                "       diag    0,0,0x44\n"
+                "0:     la      %0,0\n"
+                "1:\n"
+                EX_TABLE(0b,1b)
+                : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
+        if (!rc)
+                machine_flags |= MACHINE_FLAG_DIAG44;
+#endif
+}
+
+static __init void detect_machine_facilities(void)
+{
+#ifdef CONFIG_64BIT
+        unsigned int facilities;
+
+        facilities = stfl();
+        if (facilities & (1 << 28))
+                machine_flags |= MACHINE_FLAG_IDTE;
+        if (facilities & (1 << 23))
+                machine_flags |= MACHINE_FLAG_PFMF;
+        if (facilities & (1 << 4))
+                machine_flags |= MACHINE_FLAG_MVCOS;
+#endif
+}
+
 /*
  * Save ipl parameters, clear bss memory, initialize storage keys
  * and create a kernel NSS at startup if the SAVESYS= parm is defined
@@ -285,6 +397,13 @@ void __init startup_init(void)
         create_kernel_nss();
         sort_main_extable();
         setup_lowcore_early();
+        detect_mvpg();
+        detect_ieee();
+        detect_csp();
+        detect_diag9c();
+        detect_diag44();
+        detect_machine_facilities();
+        setup_hpage();
         sclp_read_info_early();
         sclp_facilities_detect();
         memsize = sclp_memory_detect();
diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
index dc364c1419af..a816e2de32b9 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -57,61 +57,6 @@ startup_continue:
 #
         l       %r14,.Lstartup_init-.LPG1(%r13)
         basr    %r14,%r14
-
-        l       %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
-#
-# find out if we have an IEEE fpu
-#
-        mvc     __LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13)
-        efpc    %r0,0                   # test IEEE extract fpc instruction
-        oi      3(%r12),2               # set IEEE fpu flag
-.Lchkfpu:
-
-#
-# find out if we have the CSP instruction
-#
-       mvc       __LC_PGM_NEW_PSW(8),.Lpccsp-.LPG1(%r13)
-       la        %r0,0
-       lr       %r1,%r0
-       la       %r2,4
-       csp      %r0,%r2                 # Test CSP instruction
-       oi       3(%r12),8               # set CSP flag
-.Lchkcsp:
-
-#
-# find out if we have the MVPG instruction
-#
-       mvc      __LC_PGM_NEW_PSW(8),.Lpcmvpg-.LPG1(%r13)
-       sr       %r0,%r0
-       la       %r1,0
-       la       %r2,0
-       mvpg     %r1,%r2                 # Test CSP instruction
-       oi       3(%r12),16              # set MVPG flag
-.Lchkmvpg:
-
-#
-# find out if we have the IDTE instruction
-#
-        mvc     __LC_PGM_NEW_PSW(8),.Lpcidte-.LPG1(%r13)
-        .long   0xb2b10000              # store facility list
-        tm      0xc8,0x08               # check bit for clearing-by-ASCE
-        bno     .Lchkidte-.LPG1(%r13)
-        lhi     %r1,2094
-        lhi     %r2,0
-        .long   0xb98e2001
-        oi      3(%r12),0x80            # set IDTE flag
-.Lchkidte:
-
-#
-# find out if the diag 0x9c is available
-#
-        mvc     __LC_PGM_NEW_PSW(8),.Lpcdiag9c-.LPG1(%r13)
-        stap    __LC_CPUID+4            # store cpu address
-        lh      %r1,__LC_CPUID+4
-        diag    %r1,0,0x9c              # test diag 0x9c
-        oi      2(%r12),1               # set diag9c flag
-.Lchkdiag9c:
-
         lpsw  .Lentry-.LPG1(13)         # jump to _stext in primary-space,
                                         # virtual and never return ...
         .align  8
@@ -132,13 +77,7 @@ startup_continue:
         .long   0                       # cr13: home space segment table
         .long   0xc0000000              # cr14: machine check handling off
         .long   0                       # cr15: linkage stack operations
-.Lpcfpu:.long   0x00080000,0x80000000 + .Lchkfpu
-.Lpccsp:.long   0x00080000,0x80000000 + .Lchkcsp
-.Lpcmvpg:.long  0x00080000,0x80000000 + .Lchkmvpg
-.Lpcidte:.long  0x00080000,0x80000000 + .Lchkidte
-.Lpcdiag9c:.long 0x00080000,0x80000000 + .Lchkdiag9c
 .Lmchunk:.long  memory_chunk
-.Lmflags:.long  machine_flags
 .Lbss_bgn:  .long __bss_start
 .Lbss_end:  .long _end
 .Lparmaddr: .long PARMAREA
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 79dccd206a6e..1d06961e87b3 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -125,73 +125,11 @@ startup_continue:
 # and create a kernel NSS if the SAVESYS= parm is defined
 #
         brasl   %r14,startup_init
-                                        # set program check new psw mask
-        mvc     __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
-        larl    %r12,machine_flags
-#
-# find out if we have the MVPG instruction
-#
-        la      %r1,0f-.LPG1(%r13)      # set program check address
-        stg     %r1,__LC_PGM_NEW_PSW+8
-        sgr     %r0,%r0
-        lghi    %r1,0
-        lghi    %r2,0
-        mvpg    %r1,%r2                 # test MVPG instruction
-        oi      7(%r12),16              # set MVPG flag
-0:
-
-#
-# find out if the diag 0x44 works in 64 bit mode
-#
-        la      %r1,0f-.LPG1(%r13)      # set program check address
-        stg     %r1,__LC_PGM_NEW_PSW+8
-        diag    0,0,0x44                # test diag 0x44
-        oi      7(%r12),32              # set diag44 flag
-0:
-
-#
-# find out if we have the IDTE instruction
-#
-        la      %r1,0f-.LPG1(%r13)      # set program check address
-        stg     %r1,__LC_PGM_NEW_PSW+8
-        .long   0xb2b10000              # store facility list
-        tm      0xc8,0x08               # check bit for clearing-by-ASCE
-        bno     0f-.LPG1(%r13)
-        lhi     %r1,2048
-        lhi     %r2,0
-        .long   0xb98e2001
-        oi      7(%r12),0x80            # set IDTE flag
-0:
-
-#
-# find out if the diag 0x9c is available
-#
-        la      %r1,0f-.LPG1(%r13)      # set program check address
-        stg     %r1,__LC_PGM_NEW_PSW+8
-        stap    __LC_CPUID+4            # store cpu address
-        lh      %r1,__LC_CPUID+4
-        diag    %r1,0,0x9c              # test diag 0x9c
-        oi      6(%r12),1               # set diag9c flag
-0:
-
-#
-# find out if we have the MVCOS instruction
-#
-        la      %r1,0f-.LPG1(%r13)      # set program check address
-        stg     %r1,__LC_PGM_NEW_PSW+8
-        .short  0xc800                  # mvcos 0(%r0),0(%r0),%r0
-        .short  0x0000
-        .short  0x0000
-0:      tm      0x8f,0x13               # special-operation exception?
-        bno     1f-.LPG1(%r13)          # if yes, MVCOS is present
-        oi      6(%r12),2               # set MVCOS flag
-1:
-
         lpswe   .Lentry-.LPG1(13)       # jump to _stext in primary-space,
                                         # virtual and never return ...
         .align  16
 .Lentry:.quad   0x0000000180000000,_stext
-.Lctl:  .quad   0x04b50002              # cr0: various things
+.Lctl:  .quad   0x04350002              # cr0: various things
         .quad   0                       # cr1: primary space segment table
         .quad   .Lduct                  # cr2: dispatchable unit control table
         .quad   0                       # cr3: instruction authorization
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index c1aff194141d..7920861109d2 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -180,24 +180,6 @@ void cpu_idle(void)
         }
 }
 
-void show_regs(struct pt_regs *regs)
-{
-        print_modules();
-        printk("CPU: %d %s %s %.*s\n",
-               task_thread_info(current)->cpu, print_tainted(),
-               init_utsname()->release,
-               (int)strcspn(init_utsname()->version, " "),
-               init_utsname()->version);
-        printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
-               current->comm, current->pid, current,
-               (void *) current->thread.ksp);
-        show_registers(regs);
-        /* Show stack backtrace if pt_regs is from kernel mode */
-        if (!(regs->psw.mask & PSW_MASK_PSTATE))
-                show_trace(NULL, (unsigned long *) regs->gprs[15]);
-        show_last_breaking_event(regs);
-}
-
 extern void kernel_thread_starter(void);
 
 asm(
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 58a064296987..7f4270163744 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -607,38 +607,8 @@ do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
 }
 #endif
 
-#define PT32_IEEE_IP 0x13c
-
-static int
-do_ptrace(struct task_struct *child, long request, long addr, long data)
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
-        int ret;
-
-        if (request == PTRACE_ATTACH)
-                return ptrace_attach(child);
-
-        /*
-         * Special cases to get/store the ieee instructions pointer.
-         */
-        if (child == current) {
-                if (request == PTRACE_PEEKUSR && addr == PT_IEEE_IP)
-                        return peek_user(child, addr, data);
-                if (request == PTRACE_POKEUSR && addr == PT_IEEE_IP)
-                        return poke_user(child, addr, data);
-#ifdef CONFIG_COMPAT
-                if (request == PTRACE_PEEKUSR &&
-                    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
-                        return peek_user_emu31(child, addr, data);
-                if (request == PTRACE_POKEUSR &&
-                    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
-                        return poke_user_emu31(child, addr, data);
-#endif
-        }
-
-        ret = ptrace_check_attach(child, request == PTRACE_KILL);
-        if (ret < 0)
-                return ret;
-
         switch (request) {
         case PTRACE_SYSCALL:
                 /* continue and stop at next (return from) syscall */
@@ -693,31 +663,6 @@ do_ptrace(struct task_struct *child, long request, long addr, long data)
         return -EIO;
 }
 
-asmlinkage long
-sys_ptrace(long request, long pid, long addr, long data)
-{
-        struct task_struct *child;
-        int ret;
-
-        lock_kernel();
-        if (request == PTRACE_TRACEME) {
-                 ret = ptrace_traceme();
-                 goto out;
-        }
-
-        child = ptrace_get_task_struct(pid);
-        if (IS_ERR(child)) {
-                ret = PTR_ERR(child);
-                goto out;
-        }
-
-        ret = do_ptrace(child, request, addr, data);
-        put_task_struct(child);
-out:
-        unlock_kernel();
-        return ret;
-}
-
 asmlinkage void
 syscall_trace(struct pt_regs *regs, int entryexit)
 {
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index a9d18aafa5f4..2bc70b6e876a 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -73,7 +73,7 @@ EXPORT_SYMBOL(uaccess);
 unsigned int console_mode = 0;
 unsigned int console_devno = -1;
 unsigned int console_irq = -1;
-unsigned long machine_flags = 0;
+unsigned long machine_flags;
 unsigned long elf_hwcap = 0;
 char elf_platform[ELF_PLATFORM_SIZE];
 
@@ -683,15 +683,6 @@ setup_memory(void)
 #endif
 }
 
-static __init unsigned int stfl(void)
-{
-        asm volatile(
-                "       .insn   s,0xb2b10000,0(0)\n" /* stfl */
-                "0:\n"
-                EX_TABLE(0b,0b));
-        return S390_lowcore.stfl_fac_list;
-}
-
 static int __init __stfle(unsigned long long *list, int doublewords)
 {
         typedef struct { unsigned long long _[doublewords]; } addrtype;
@@ -758,6 +749,9 @@ static void __init setup_hwcaps(void)
                         elf_hwcap |= 1UL << 6;
         }
 
+        if (MACHINE_HAS_HPAGE)
+                elf_hwcap |= 1UL << 7;
+
         switch (cpuinfo->cpu_id.machine) {
         case 0x9672:
 #if !defined(CONFIG_64BIT)
@@ -881,8 +875,9 @@ void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 
 static int show_cpuinfo(struct seq_file *m, void *v)
 {
-        static const char *hwcap_str[7] = {
-                "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
+        static const char *hwcap_str[8] = {
+                "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
+                "edat"
         };
         struct cpuinfo_S390 *cpuinfo;
         unsigned long n = (unsigned long) v - 1;
@@ -897,7 +892,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
                                (loops_per_jiffy/(5000/HZ))%100);
                 seq_puts(m, "features\t: ");
-                for (i = 0; i < 7; i++)
+                for (i = 0; i < 8; i++)
                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
                                 seq_printf(m, "%s ", hwcap_str[i]);
                 seq_puts(m, "\n");
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 0dfa988c1b26..0aeb290060d9 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -505,7 +505,7 @@ out:
         return rc;
 }
 
-static int smp_rescan_cpus(void)
+static int __smp_rescan_cpus(void)
 {
         cpumask_t avail;
 
@@ -570,7 +570,7 @@ out:
         kfree(info);
         printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
         get_online_cpus();
-        smp_rescan_cpus();
+        __smp_rescan_cpus();
         put_online_cpus();
 }
 
@@ -890,8 +890,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
         if (val != 0 && val != 1)
                 return -EINVAL;
 
-        mutex_lock(&smp_cpu_state_mutex);
         get_online_cpus();
+        mutex_lock(&smp_cpu_state_mutex);
         rc = -EBUSY;
         if (cpu_online(cpu))
                 goto out;
@@ -919,8 +919,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
                 break;
         }
 out:
-        put_online_cpus();
         mutex_unlock(&smp_cpu_state_mutex);
+        put_online_cpus();
         return rc ? rc : count;
 }
 static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
@@ -1088,17 +1088,17 @@ out:
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-static ssize_t __ref rescan_store(struct sys_device *dev,
-                                  const char *buf, size_t count)
+
+int smp_rescan_cpus(void)
 {
         cpumask_t newcpus;
         int cpu;
         int rc;
 
-        mutex_lock(&smp_cpu_state_mutex);
         get_online_cpus();
+        mutex_lock(&smp_cpu_state_mutex);
         newcpus = cpu_present_map;
-        rc = smp_rescan_cpus();
+        rc = __smp_rescan_cpus();
         if (rc)
                 goto out;
         cpus_andnot(newcpus, cpu_present_map, newcpus);
@@ -1109,10 +1109,19 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
         }
         rc = 0;
 out:
-        put_online_cpus();
         mutex_unlock(&smp_cpu_state_mutex);
+        put_online_cpus();
         if (!cpus_empty(newcpus))
                 topology_schedule_update();
+        return rc;
+}
+
+static ssize_t __ref rescan_store(struct sys_device *dev, const char *buf,
+                                  size_t count)
+{
+        int rc;
+
+        rc = smp_rescan_cpus();
         return rc ? rc : count;
 }
 static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);
@@ -1139,16 +1148,16 @@ static ssize_t dispatching_store(struct sys_device *dev, const char *buf,
         if (val != 0 && val != 1)
                 return -EINVAL;
         rc = 0;
-        mutex_lock(&smp_cpu_state_mutex);
         get_online_cpus();
+        mutex_lock(&smp_cpu_state_mutex);
         if (cpu_management == val)
                 goto out;
         rc = topology_set_cpu_management(val);
         if (!rc)
                 cpu_management = val;
 out:
-        put_online_cpus();
         mutex_unlock(&smp_cpu_state_mutex);
+        put_online_cpus();
         return rc ? rc : count;
 }
 static SYSDEV_ATTR(dispatching, 0644, dispatching_show, dispatching_store);
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 12b39b3d9c38..661a07217057 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -9,6 +9,7 @@
 #include <linux/device.h>
 #include <linux/bootmem.h>
 #include <linux/sched.h>
+#include <linux/kthread.h>
 #include <linux/workqueue.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
@@ -66,6 +67,8 @@ static struct timer_list topology_timer;
 static void set_topology_timer(void);
 static DECLARE_WORK(topology_work, topology_work_fn);
 
+cpumask_t cpu_core_map[NR_CPUS];
+
 cpumask_t cpu_coregroup_map(unsigned int cpu)
 {
         struct core_info *core = &core_info;
@@ -199,6 +202,14 @@ int topology_set_cpu_management(int fc)
         return rc;
 }
 
+static void update_cpu_core_map(void)
+{
+        int cpu;
+
+        for_each_present_cpu(cpu)
+                cpu_core_map[cpu] = cpu_coregroup_map(cpu);
+}
+
 void arch_update_cpu_topology(void)
 {
         struct tl_info *info = tl_info;
@@ -206,20 +217,33 @@ void arch_update_cpu_topology(void)
         int cpu;
 
         if (!machine_has_topology) {
+                update_cpu_core_map();
                 topology_update_polarization_simple();
                 return;
         }
         stsi(info, 15, 1, 2);
         tl_to_cores(info);
+        update_cpu_core_map();
         for_each_online_cpu(cpu) {
                 sysdev = get_cpu_sysdev(cpu);
                 kobject_uevent(&sysdev->kobj, KOBJ_CHANGE);
         }
 }
 
-static void topology_work_fn(struct work_struct *work)
+static int topology_kthread(void *data)
 {
         arch_reinit_sched_domains();
+        return 0;
+}
+
+static void topology_work_fn(struct work_struct *work)
+{
+        /* We can't call arch_reinit_sched_domains() from a multi-threaded
+         * workqueue context since it may deadlock in case of cpu hotplug.
+         * So we have to create a kernel thread in order to call
+         * arch_reinit_sched_domains().
+         */
+        kthread_run(topology_kthread, NULL, "topology_update");
 }
 
 void topology_schedule_update(void)
@@ -251,20 +275,23 @@ static int __init init_topology_update(void)
 {
         int rc;
 
+        rc = 0;
         if (!machine_has_topology) {
                 topology_update_polarization_simple();
-                return 0;
+                goto out;
         }
         init_timer_deferrable(&topology_timer);
         if (machine_has_topology_irq) {
                 rc = register_external_interrupt(0x2005, topology_interrupt);
                 if (rc)
-                        return rc;
+                        goto out;
                 ctl_set_bit(0, 8);
         }
         else
                 set_topology_timer();
-        return 0;
+out:
+        update_cpu_core_map();
+        return rc;
 }
 __initcall(init_topology_update);
 
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 57b607b61100..4584d81984c0 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -113,7 +113,7 @@ __show_trace(unsigned long sp, unsigned long low, unsigned long high)
         }
 }
 
-void show_trace(struct task_struct *task, unsigned long *stack)
+static void show_trace(struct task_struct *task, unsigned long *stack)
 {
         register unsigned long __r15 asm ("15");
         unsigned long sp;
@@ -161,14 +161,14 @@ void show_stack(struct task_struct *task, unsigned long *sp)
         show_trace(task, sp);
 }
 
-#ifdef CONFIG_64BIT
-void show_last_breaking_event(struct pt_regs *regs)
+static void show_last_breaking_event(struct pt_regs *regs)
 {
+#ifdef CONFIG_64BIT
         printk("Last Breaking-Event-Address:\n");
         printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
         print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
-}
 #endif
+}
 
 /*
  * The architecture-independent dump_stack generator
@@ -223,6 +223,24 @@ void show_registers(struct pt_regs *regs)
         show_code(regs);
 }       
 
+void show_regs(struct pt_regs *regs)
+{
+        print_modules();
+        printk("CPU: %d %s %s %.*s\n",
+               task_thread_info(current)->cpu, print_tainted(),
+               init_utsname()->release,
+               (int)strcspn(init_utsname()->version, " "),
+               init_utsname()->version);
+        printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
+               current->comm, current->pid, current,
+               (void *) current->thread.ksp);
+        show_registers(regs);
+        /* Show stack backtrace if pt_regs is from kernel mode */
+        if (!(regs->psw.mask & PSW_MASK_PSTATE))
+                show_trace(NULL, (unsigned long *) regs->gprs[15]);
+        show_last_breaking_event(regs);
+}
+
 /* This is called from fs/proc/array.c */
 void task_show_regs(struct seq_file *m, struct task_struct *task)
 {