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

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (30 commits)
  [S390] wire up sys_perf_counter_open
  [S390] wire up sys_rt_tgsigqueueinfo
  [S390] ftrace: add system call tracer support
  [S390] ftrace: add function graph tracer support
  [S390] ftrace: add function trace mcount test support
  [S390] ftrace: add dynamic ftrace support
  [S390] kprobes: use probe_kernel_write
  [S390] maccess: arch specific probe_kernel_write() implementation
  [S390] maccess: add weak attribute to probe_kernel_write
  [S390] profile_tick called twice
  [S390] dasd: forward internal errors to dasd_sleep_on caller
  [S390] dasd: sync after async probe
  [S390] dasd: check_characteristics cleanup
  [S390] dasd: no High Performance FICON in 31-bit mode
  [S390] dcssblk: revert devt conversion
  [S390] qdio: fix access beyond ARRAY_SIZE of irq_ptr->{in,out}put_qs
  [S390] vmalloc: add vmalloc kernel parameter support
  [S390] uaccess: use might_fault() instead of might_sleep()
  [S390] 3270: lock dependency fixes
  [S390] 3270: do not register with tty_register_device
  ...

5 files changed, 82 insertions, 11 deletions

diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index 2a7458134544..db05661ac895 100644
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux s390-specific parts of the memory manager.
 #
 
-obj-y    := init.o fault.o extmem.o mmap.o vmem.o pgtable.o
+obj-y    := init.o fault.o extmem.o mmap.o vmem.o pgtable.o maccess.o
 obj-$(CONFIG_CMM) += cmm.o
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 obj-$(CONFIG_PAGE_STATES) += page-states.o
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 833e8366c351..220a152c836c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -19,6 +19,7 @@
 #include <linux/ptrace.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
+#include <linux/compat.h>
 #include <linux/smp.h>
 #include <linux/kdebug.h>
 #include <linux/smp_lock.h>
@@ -239,7 +240,7 @@ static int signal_return(struct mm_struct *mm, struct pt_regs *regs,
         up_read(&mm->mmap_sem);
         clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
 #ifdef CONFIG_COMPAT
-        compat = test_tsk_thread_flag(current, TIF_31BIT);
+        compat = is_compat_task();
         if (compat && instruction == 0x0a77)
                 sys32_sigreturn();
         else if (compat && instruction == 0x0aad)
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
new file mode 100644
index 000000000000..81756271dc44
--- /dev/null
+++ b/arch/s390/mm/maccess.c
@@ -0,0 +1,61 @@
+/*
+ * Access kernel memory without faulting -- s390 specific implementation.
+ *
+ * Copyright IBM Corp. 2009
+ *
+ *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
+ *
+ */
+
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/system.h>
+
+/*
+ * This function writes to kernel memory bypassing DAT and possible
+ * write protection. It copies one to four bytes from src to dst
+ * using the stura instruction.
+ * Returns the number of bytes copied or -EFAULT.
+ */
+static long probe_kernel_write_odd(void *dst, void *src, size_t size)
+{
+        unsigned long count, aligned;
+        int offset, mask;
+        int rc = -EFAULT;
+
+        aligned = (unsigned long) dst & ~3UL;
+        offset = (unsigned long) dst & 3;
+        count = min_t(unsigned long, 4 - offset, size);
+        mask = (0xf << (4 - count)) & 0xf;
+        mask >>= offset;
+        asm volatile(
+                "       bras    1,0f\n"
+                "       icm     0,0,0(%3)\n"
+                "0:     l       0,0(%1)\n"
+                "       lra     %1,0(%1)\n"
+                "1:     ex      %2,0(1)\n"
+                "2:     stura   0,%1\n"
+                "       la      %0,0\n"
+                "3:\n"
+                EX_TABLE(0b,3b) EX_TABLE(1b,3b) EX_TABLE(2b,3b)
+                : "+d" (rc), "+a" (aligned)
+                : "a" (mask), "a" (src) : "cc", "memory", "0", "1");
+        return rc ? rc : count;
+}
+
+long probe_kernel_write(void *dst, void *src, size_t size)
+{
+        long copied = 0;
+
+        while (size) {
+                copied = probe_kernel_write_odd(dst, src, size);
+                if (copied < 0)
+                        break;
+                dst += copied;
+                src += copied;
+                size -= copied;
+        }
+        return copied < 0 ? -EFAULT : 0;
+}
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index e008d236cc15..f4558ccf02b9 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -28,6 +28,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <asm/pgalloc.h>
+#include <asm/compat.h>
 
 /*
  * Top of mmap area (just below the process stack).
@@ -55,7 +56,7 @@ static inline int mmap_is_legacy(void)
         /*
          * Force standard allocation for 64 bit programs.
          */
-        if (!test_thread_flag(TIF_31BIT))
+        if (!is_compat_task())
                 return 1;
 #endif
         return sysctl_legacy_va_layout ||
@@ -91,7 +92,7 @@ EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
 
 int s390_mmap_check(unsigned long addr, unsigned long len)
 {
-        if (!test_thread_flag(TIF_31BIT) &&
+        if (!is_compat_task() &&
             len >= TASK_SIZE && TASK_SIZE < (1UL << 53))
                 return crst_table_upgrade(current->mm, 1UL << 53);
         return 0;
@@ -108,8 +109,7 @@ s390_get_unmapped_area(struct file *filp, unsigned long addr,
         area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
         if (!(area & ~PAGE_MASK))
                 return area;
-        if (area == -ENOMEM &&
-            !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+        if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
                 /* Upgrade the page table to 4 levels and retry. */
                 rc = crst_table_upgrade(mm, 1UL << 53);
                 if (rc)
@@ -131,8 +131,7 @@ s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
         area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
         if (!(area & ~PAGE_MASK))
                 return area;
-        if (area == -ENOMEM &&
-            !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+        if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
                 /* Upgrade the page table to 4 levels and retry. */
                 rc = crst_table_upgrade(mm, 1UL << 53);
                 if (rc)
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index be6c1cf4ad5a..4ca8e826bf30 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -1,7 +1,5 @@
 /*
- *  arch/s390/mm/pgtable.c
- *
- *    Copyright IBM Corp. 2007
+ *    Copyright IBM Corp. 2007,2009
  *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
  */
 
@@ -53,6 +51,18 @@ void clear_table_pgstes(unsigned long *table)
 
 #endif
 
+unsigned long VMALLOC_START = VMALLOC_END - VMALLOC_SIZE;
+EXPORT_SYMBOL(VMALLOC_START);
+
+static int __init parse_vmalloc(char *arg)
+{
+        if (!arg)
+                return -EINVAL;
+        VMALLOC_START = (VMALLOC_END - memparse(arg, &arg)) & PAGE_MASK;
+        return 0;
+}
+early_param("vmalloc", parse_vmalloc);
+
 unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
 {
         struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);