11 files changed, 108 insertions, 65 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 2b7c0fbe578e..9015060919a0 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -90,7 +90,6 @@ config S390
         select HAVE_KERNEL_XZ
         select HAVE_ARCH_MUTEX_CPU_RELAX
         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
-        select HAVE_RCU_TABLE_FREE if SMP
         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
         select HAVE_MEMBLOCK
         select HAVE_MEMBLOCK_NODE_MAP
diff --git a/arch/s390/defconfig b/arch/s390/defconfig
index 6cf8e26b3137..1957a9dd256d 100644
--- a/arch/s390/defconfig
+++ b/arch/s390/defconfig
@@ -1,8 +1,12 @@
 CONFIG_EXPERIMENTAL=y
 CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
+CONFIG_FHANDLE=y
+CONFIG_TASKSTATS=y
+CONFIG_TASK_DELAY_ACCT=y
+CONFIG_TASK_XACCT=y
+CONFIG_TASK_IO_ACCOUNTING=y
 CONFIG_AUDIT=y
-CONFIG_RCU_TRACE=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_CGROUPS=y
@@ -14,16 +18,22 @@ CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
 CONFIG_CGROUP_SCHED=y
 CONFIG_RT_GROUP_SCHED=y
 CONFIG_BLK_CGROUP=y
+CONFIG_NAMESPACES=y
 CONFIG_BLK_DEV_INITRD=y
-# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
+CONFIG_RD_BZIP2=y
+CONFIG_RD_LZMA=y
+CONFIG_RD_XZ=y
+CONFIG_RD_LZO=y
+CONFIG_EXPERT=y
 # CONFIG_COMPAT_BRK is not set
-CONFIG_SLAB=y
 CONFIG_PROFILING=y
 CONFIG_OPROFILE=y
 CONFIG_KPROBES=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODVERSIONS=y
+CONFIG_PARTITION_ADVANCED=y
+CONFIG_IBM_PARTITION=y
 CONFIG_DEFAULT_DEADLINE=y
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
@@ -34,18 +44,15 @@ CONFIG_KSM=y
 CONFIG_BINFMT_MISC=m
 CONFIG_CMM=m
 CONFIG_HZ_100=y
-CONFIG_KEXEC=y
-CONFIG_PM=y
+CONFIG_CRASH_DUMP=y
 CONFIG_HIBERNATION=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_NET_KEY=y
-CONFIG_AFIUCV=m
 CONFIG_INET=y
 CONFIG_IP_MULTICAST=y
 # CONFIG_INET_LRO is not set
 CONFIG_IPV6=y
-CONFIG_NET_SCTPPROBE=m
 CONFIG_L2TP=m
 CONFIG_L2TP_DEBUGFS=m
 CONFIG_VLAN_8021Q=y
@@ -84,15 +91,14 @@ CONFIG_SCSI_CONSTANTS=y
 CONFIG_SCSI_LOGGING=y
 CONFIG_SCSI_SCAN_ASYNC=y
 CONFIG_ZFCP=y
-CONFIG_ZFCP_DIF=y
 CONFIG_NETDEVICES=y
-CONFIG_DUMMY=m
 CONFIG_BONDING=m
+CONFIG_DUMMY=m
 CONFIG_EQUALIZER=m
 CONFIG_TUN=m
-CONFIG_NET_ETHERNET=y
 CONFIG_VIRTIO_NET=y
 CONFIG_RAW_DRIVER=m
+CONFIG_VIRTIO_BALLOON=y
 CONFIG_EXT2_FS=y
 CONFIG_EXT3_FS=y
 # CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
@@ -103,27 +109,21 @@ CONFIG_PROC_KCORE=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
 # CONFIG_NETWORK_FILESYSTEMS is not set
-CONFIG_PARTITION_ADVANCED=y
-CONFIG_IBM_PARTITION=y
-CONFIG_DLM=m
 CONFIG_MAGIC_SYSRQ=y
-CONFIG_DEBUG_KERNEL=y
 CONFIG_TIMER_STATS=y
 CONFIG_PROVE_LOCKING=y
 CONFIG_PROVE_RCU=y
 CONFIG_LOCK_STAT=y
 CONFIG_DEBUG_LOCKDEP=y
-CONFIG_DEBUG_SPINLOCK_SLEEP=y
 CONFIG_DEBUG_LIST=y
 CONFIG_DEBUG_NOTIFIERS=y
-# CONFIG_RCU_CPU_STALL_DETECTOR is not set
+CONFIG_RCU_TRACE=y
 CONFIG_KPROBES_SANITY_TEST=y
 CONFIG_DEBUG_FORCE_WEAK_PER_CPU=y
 CONFIG_CPU_NOTIFIER_ERROR_INJECT=m
 CONFIG_LATENCYTOP=y
-CONFIG_SYSCTL_SYSCALL_CHECK=y
 CONFIG_DEBUG_PAGEALLOC=y
-# CONFIG_FTRACE is not set
+CONFIG_BLK_DEV_IO_TRACE=y
 # CONFIG_STRICT_DEVMEM is not set
 CONFIG_CRYPTO_NULL=m
 CONFIG_CRYPTO_CRYPTD=m
@@ -173,4 +173,3 @@ CONFIG_CRYPTO_SHA512_S390=m
 CONFIG_CRYPTO_DES_S390=m
 CONFIG_CRYPTO_AES_S390=m
 CONFIG_CRC7=m
-CONFIG_VIRTIO_BALLOON=y
diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h
index 1e5b27edc0c9..2ee66a65f2d4 100644
--- a/arch/s390/include/asm/facility.h
+++ b/arch/s390/include/asm/facility.h
@@ -38,12 +38,11 @@ static inline void stfle(u64 *stfle_fac_list, int size)
         unsigned long nr;
 
         preempt_disable();
-        S390_lowcore.stfl_fac_list = 0;
         asm volatile(
                 "       .insn s,0xb2b10000,0(0)\n" /* stfl */
                 "0:\n"
                 EX_TABLE(0b, 0b)
-                : "=m" (S390_lowcore.stfl_fac_list));
+                : "+m" (S390_lowcore.stfl_fac_list));
         nr = 4; /* bytes stored by stfl */
         memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
         if (S390_lowcore.stfl_fac_list & 0x01000000) {
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index 8eef9b5b3cf4..78e3041919de 100644
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -22,10 +22,7 @@ void crst_table_free(struct mm_struct *, unsigned long *);
 
 unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
 void page_table_free(struct mm_struct *, unsigned long *);
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
 void page_table_free_rcu(struct mmu_gather *, unsigned long *);
-void __tlb_remove_table(void *_table);
-#endif
 
 static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
 {
diff --git a/arch/s390/include/asm/swab.h b/arch/s390/include/asm/swab.h
index 6bdee21c077e..a3e4ebb32090 100644
--- a/arch/s390/include/asm/swab.h
+++ b/arch/s390/include/asm/swab.h
@@ -77,7 +77,7 @@ static inline __u16 __arch_swab16p(const __u16 *x)
         
         asm volatile(
 #ifndef __s390x__
-                "       icm     %0,2,%O+1(%R1)\n"
+                "       icm     %0,2,%O1+1(%R1)\n"
                 "       ic      %0,%1\n"
                 : "=&d" (result) : "Q" (*x) : "cc");
 #else /* __s390x__ */
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index c687a2c83462..775a5eea8f9e 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -30,14 +30,10 @@
 
 struct mmu_gather {
         struct mm_struct *mm;
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
         struct mmu_table_batch *batch;
-#endif
         unsigned int fullmm;
-        unsigned int need_flush;
 };
 
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
 struct mmu_table_batch {
         struct rcu_head         rcu;
         unsigned int            nr;
@@ -49,7 +45,6 @@ struct mmu_table_batch {
 
 extern void tlb_table_flush(struct mmu_gather *tlb);
 extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
-#endif
 
 static inline void tlb_gather_mmu(struct mmu_gather *tlb,
                                   struct mm_struct *mm,
@@ -57,29 +52,20 @@ static inline void tlb_gather_mmu(struct mmu_gather *tlb,
 {
         tlb->mm = mm;
         tlb->fullmm = full_mm_flush;
-        tlb->need_flush = 0;
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
         tlb->batch = NULL;
-#endif
         if (tlb->fullmm)
                 __tlb_flush_mm(mm);
 }
 
 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
 {
-        if (!tlb->need_flush)
-                return;
-        tlb->need_flush = 0;
-        __tlb_flush_mm(tlb->mm);
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
         tlb_table_flush(tlb);
-#endif
 }
 
 static inline void tlb_finish_mmu(struct mmu_gather *tlb,
                                   unsigned long start, unsigned long end)
 {
-        tlb_flush_mmu(tlb);
+        tlb_table_flush(tlb);
 }
 
 /*
@@ -105,10 +91,8 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
 static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
                                 unsigned long address)
 {
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
         if (!tlb->fullmm)
                 return page_table_free_rcu(tlb, (unsigned long *) pte);
-#endif
         page_table_free(tlb->mm, (unsigned long *) pte);
 }
 
@@ -125,10 +109,8 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 #ifdef __s390x__
         if (tlb->mm->context.asce_limit <= (1UL << 31))
                 return;
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
         if (!tlb->fullmm)
                 return tlb_remove_table(tlb, pmd);
-#endif
         crst_table_free(tlb->mm, (unsigned long *) pmd);
 #endif
 }
@@ -146,10 +128,8 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 #ifdef __s390x__
         if (tlb->mm->context.asce_limit <= (1UL << 42))
                 return;
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
         if (!tlb->fullmm)
                 return tlb_remove_table(tlb, pud);
-#endif
         crst_table_free(tlb->mm, (unsigned long *) pud);
 #endif
 }
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index c27a0727f930..adccd908ebc7 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -474,9 +474,9 @@ ENTRY(startup_kdump)
         stck    __LC_LAST_UPDATE_CLOCK
         spt     5f-.LPG0(%r13)
         mvc     __LC_LAST_UPDATE_TIMER(8),5f-.LPG0(%r13)
+        xc      __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
 #ifndef CONFIG_MARCH_G5
         # check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
-        xc      __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
         .insn   s,0xb2b10000,__LC_STFL_FAC_LIST # store facility list
         tm      __LC_STFL_FAC_LIST,0x01 # stfle available ?
         jz      0f
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 1c2cdd59ccd0..8a22c27219dd 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -118,9 +118,10 @@ asmlinkage void do_softirq(void)
                                          "a" (__do_softirq)
                                      : "0", "1", "2", "3", "4", "5", "14",
                                        "cc", "memory" );
-                } else
+                } else {
                         /* We are already on the async stack. */
                         __do_softirq();
+                }
         }
 
         local_irq_restore(flags);
@@ -192,11 +193,12 @@ int unregister_external_interrupt(u16 code, ext_int_handler_t handler)
         int index = ext_hash(code);
 
         spin_lock_irqsave(&ext_int_hash_lock, flags);
-        list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
+        list_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
                 if (p->code == code && p->handler == handler) {
                         list_del_rcu(&p->entry);
                         kfree_rcu(p, rcu);
                 }
+        }
         spin_unlock_irqrestore(&ext_int_hash_lock, flags);
         return 0;
 }
@@ -211,9 +213,10 @@ void __irq_entry do_extint(struct pt_regs *regs, struct ext_code ext_code,
 
         old_regs = set_irq_regs(regs);
         irq_enter();
-        if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
+        if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) {
                 /* Serve timer interrupts first. */
                 clock_comparator_work();
+        }
         kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
         if (ext_code.code != 0x1004)
                 __get_cpu_var(s390_idle).nohz_delay = 1;
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index 46405086479c..cb019f429e88 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -178,7 +178,7 @@ static void cpumf_pmu_enable(struct pmu *pmu)
         err = lcctl(cpuhw->state);
         if (err) {
                 pr_err("Enabling the performance measuring unit "
-                       "failed with rc=%lx\n", err);
+                       "failed with rc=%x\n", err);
                 return;
         }
 
@@ -203,7 +203,7 @@ static void cpumf_pmu_disable(struct pmu *pmu)
         err = lcctl(inactive);
         if (err) {
                 pr_err("Disabling the performance measuring unit "
-                       "failed with rc=%lx\n", err);
+                       "failed with rc=%x\n", err);
                 return;
         }
 
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index 7bb15fcca75e..e1335dc2b1b7 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -61,21 +61,14 @@ long probe_kernel_write(void *dst, const void *src, size_t size)
         return copied < 0 ? -EFAULT : 0;
 }
 
-/*
- * Copy memory in real mode (kernel to kernel)
- */
-int memcpy_real(void *dest, void *src, size_t count)
+static int __memcpy_real(void *dest, void *src, size_t count)
 {
         register unsigned long _dest asm("2") = (unsigned long) dest;
         register unsigned long _len1 asm("3") = (unsigned long) count;
         register unsigned long _src  asm("4") = (unsigned long) src;
         register unsigned long _len2 asm("5") = (unsigned long) count;
-        unsigned long flags;
         int rc = -EFAULT;
 
-        if (!count)
-                return 0;
-        flags = __arch_local_irq_stnsm(0xf8UL);
         asm volatile (
                 "0:     mvcle   %1,%2,0x0\n"
                 "1:     jo      0b\n"
@@ -86,7 +79,23 @@ int memcpy_real(void *dest, void *src, size_t count)
                   "+d" (_len2), "=m" (*((long *) dest))
                 : "m" (*((long *) src))
                 : "cc", "memory");
-        arch_local_irq_restore(flags);
+        return rc;
+}
+
+/*
+ * Copy memory in real mode (kernel to kernel)
+ */
+int memcpy_real(void *dest, void *src, size_t count)
+{
+        unsigned long flags;
+        int rc;
+
+        if (!count)
+                return 0;
+        local_irq_save(flags);
+        __arch_local_irq_stnsm(0xfbUL);
+        rc = __memcpy_real(dest, src, count);
+        local_irq_restore(flags);
         return rc;
 }
 
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 373adf69b01c..6e765bf00670 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -678,8 +678,6 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
         }
 }
 
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
-
 static void __page_table_free_rcu(void *table, unsigned bit)
 {
         struct page *page;
@@ -733,7 +731,66 @@ void __tlb_remove_table(void *_table)
                 free_pages((unsigned long) table, ALLOC_ORDER);
 }
 
-#endif
+static void tlb_remove_table_smp_sync(void *arg)
+{
+        /* Simply deliver the interrupt */
+}
+
+static void tlb_remove_table_one(void *table)
+{
+        /*
+         * This isn't an RCU grace period and hence the page-tables cannot be
+         * assumed to be actually RCU-freed.
+         *
+         * It is however sufficient for software page-table walkers that rely
+         * on IRQ disabling. See the comment near struct mmu_table_batch.
+         */
+        smp_call_function(tlb_remove_table_smp_sync, NULL, 1);
+        __tlb_remove_table(table);
+}
+
+static void tlb_remove_table_rcu(struct rcu_head *head)
+{
+        struct mmu_table_batch *batch;
+        int i;
+
+        batch = container_of(head, struct mmu_table_batch, rcu);
+
+        for (i = 0; i < batch->nr; i++)
+                __tlb_remove_table(batch->tables[i]);
+
+        free_page((unsigned long)batch);
+}
+
+void tlb_table_flush(struct mmu_gather *tlb)
+{
+        struct mmu_table_batch **batch = &tlb->batch;
+
+        if (*batch) {
+                __tlb_flush_mm(tlb->mm);
+                call_rcu_sched(&(*batch)->rcu, tlb_remove_table_rcu);
+                *batch = NULL;
+        }
+}
+
+void tlb_remove_table(struct mmu_gather *tlb, void *table)
+{
+        struct mmu_table_batch **batch = &tlb->batch;
+
+        if (*batch == NULL) {
+                *batch = (struct mmu_table_batch *)
+                        __get_free_page(GFP_NOWAIT | __GFP_NOWARN);
+                if (*batch == NULL) {
+                        __tlb_flush_mm(tlb->mm);
+                        tlb_remove_table_one(table);
+                        return;
+                }
+                (*batch)->nr = 0;
+        }
+        (*batch)->tables[(*batch)->nr++] = table;
+        if ((*batch)->nr == MAX_TABLE_BATCH)
+                tlb_table_flush(tlb);
+}
 
 /*
  * switch on pgstes for its userspace process (for kvm)