8 files changed, 36 insertions, 17 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b21444b681b6..1831833c430e 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -61,6 +61,7 @@ config S390
         def_bool y
         select HAVE_OPROFILE
         select HAVE_KPROBES
+        select HAVE_KRETPROBES
 
 source "init/Kconfig"
 
@@ -350,6 +351,10 @@ endchoice
 
 source "fs/Kconfig.binfmt"
 
+config FORCE_MAX_ZONEORDER
+        int
+        default "9"
+
 config PROCESS_DEBUG
         bool "Show crashed user process info"
         help
diff --git a/arch/s390/defconfig b/arch/s390/defconfig
index 39921f3a9685..62f6b5a606dd 100644
--- a/arch/s390/defconfig
+++ b/arch/s390/defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.24
-# Sat Feb  9 12:13:01 2008
+# Linux kernel version: 2.6.25-rc4
+# Wed Mar  5 11:22:59 2008
 #
 CONFIG_MMU=y
 CONFIG_ZONE_DMA=y
@@ -43,12 +43,15 @@ CONFIG_CGROUPS=y
 # CONFIG_CGROUP_DEBUG is not set
 CONFIG_CGROUP_NS=y
 # CONFIG_CPUSETS is not set
+CONFIG_GROUP_SCHED=y
 CONFIG_FAIR_GROUP_SCHED=y
-CONFIG_FAIR_USER_SCHED=y
-# CONFIG_FAIR_CGROUP_SCHED is not set
+# CONFIG_RT_GROUP_SCHED is not set
+CONFIG_USER_SCHED=y
+# CONFIG_CGROUP_SCHED is not set
 # CONFIG_CGROUP_CPUACCT is not set
 # CONFIG_RESOURCE_COUNTERS is not set
 CONFIG_SYSFS_DEPRECATED=y
+CONFIG_SYSFS_DEPRECATED_V2=y
 # CONFIG_RELAY is not set
 CONFIG_NAMESPACES=y
 CONFIG_UTS_NS=y
@@ -85,7 +88,9 @@ CONFIG_SLAB=y
 # CONFIG_MARKERS is not set
 CONFIG_HAVE_OPROFILE=y
 CONFIG_KPROBES=y
+CONFIG_KRETPROBES=y
 CONFIG_HAVE_KPROBES=y
+CONFIG_HAVE_KRETPROBES=y
 CONFIG_PROC_PAGE_MONITOR=y
 CONFIG_SLABINFO=y
 CONFIG_RT_MUTEXES=y
@@ -185,6 +190,7 @@ CONFIG_IPL=y
 CONFIG_IPL_VM=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=m
+CONFIG_FORCE_MAX_ZONEORDER=9
 # CONFIG_PROCESS_DEBUG is not set
 CONFIG_PFAULT=y
 # CONFIG_SHARED_KERNEL is not set
@@ -435,6 +441,7 @@ CONFIG_DASD_EER=y
 CONFIG_MISC_DEVICES=y
 # CONFIG_EEPROM_93CX6 is not set
 # CONFIG_ENCLOSURE_SERVICES is not set
+# CONFIG_HAVE_IDE is not set
 
 #
 # SCSI device support
@@ -593,6 +600,7 @@ CONFIG_S390_VMUR=m
 #
 # Sonics Silicon Backplane
 #
+# CONFIG_MEMSTICK is not set
 
 #
 # File systems
@@ -750,7 +758,6 @@ CONFIG_DEBUG_BUGVERBOSE=y
 # CONFIG_DEBUG_LIST is not set
 # CONFIG_DEBUG_SG is not set
 # CONFIG_FRAME_POINTER is not set
-CONFIG_FORCED_INLINING=y
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_KPROBES_SANITY_TEST is not set
 # CONFIG_BACKTRACE_SELF_TEST is not set
@@ -759,6 +766,7 @@ CONFIG_FORCED_INLINING=y
 # CONFIG_LATENCYTOP is not set
 CONFIG_SAMPLES=y
 # CONFIG_SAMPLE_KOBJECT is not set
+# CONFIG_SAMPLE_KPROBES is not set
 # CONFIG_DEBUG_PAGEALLOC is not set
 
 #
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index b3b650a93c7c..4d3e38392cb1 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -4,6 +4,11 @@
 
 EXTRA_AFLAGS    := -traditional
 
+#
+# Passing null pointers is ok for smp code, since we access the lowcore here.
+#
+CFLAGS_smp.o    := -Wno-nonnull
+
 obj-y   :=  bitmap.o traps.o time.o process.o base.o early.o \
             setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
             semaphore.o s390_ext.o debug.o irq.o ipl.o dis.o diag.o
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 9f7b73b180f0..01832c440636 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -88,13 +88,17 @@ static noinline __init void create_kernel_nss(void)
 
         __cpcmd(defsys_cmd, NULL, 0, &response);
 
-        if (response != 0)
+        if (response != 0) {
+                kernel_nss_name[0] = '\0';
                 return;
+        }
 
         __cpcmd(savesys_cmd, NULL, 0, &response);
 
-        if (response != strlen(savesys_cmd))
+        if (response != strlen(savesys_cmd)) {
+                kernel_nss_name[0] = '\0';
                 return;
+        }
 
         ipl_flags = IPL_NSS_VALID;
 }
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 60acdc266db1..375232c46c7a 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -704,6 +704,7 @@ void reipl_run(struct shutdown_trigger *trigger)
         default:
                 break;
         }
+        disabled_wait((unsigned long) __builtin_return_address(0));
 }
 
 static void __init reipl_probe(void)
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 1c59ec161cf8..ce203154d8ce 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -152,6 +152,10 @@ static void default_idle(void)
         local_mcck_disable();
         if (test_thread_flag(TIF_MCCK_PENDING)) {
                 local_mcck_enable();
+                /* disable monitor call class 0 */
+                __ctl_clear_bit(8, 15);
+                atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
+                                           hcpu);
                 local_irq_enable();
                 s390_handle_mcck();
                 return;
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 818bd09c0260..8f894d380a62 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -629,14 +629,8 @@ static int __cpuinit smp_alloc_lowcore(int cpu)
         panic_stack = __get_free_page(GFP_KERNEL);
         if (!panic_stack || !async_stack)
                 goto out;
-        /*
-         * Only need to copy the first 512 bytes from address 0. But since
-         * the compiler emits a warning if src == NULL for memcpy use copy_page
-         * instead. Copies more than needed but this code is not performance
-         * critical.
-         */
-        copy_page(lowcore, &S390_lowcore);
-        memset((void *)lowcore + 512, 0, sizeof(*lowcore) - 512);
+        memcpy(lowcore, &S390_lowcore, 512);
+        memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
         lowcore->async_stack = async_stack + ASYNC_SIZE;
         lowcore->panic_stack = panic_stack + PAGE_SIZE;
 
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 76a5dd1b4ce9..cb232c155360 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -209,8 +209,6 @@ static void stop_hz_timer(void)
  */
 static void start_hz_timer(void)
 {
-        BUG_ON(!in_interrupt());
-
         if (!cpu_isset(smp_processor_id(), nohz_cpu_mask))
                 return;
         account_ticks(get_clock());