Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6:
  [PARISC] unwinder improvements
  [PARISC] Fix unwinder on 64-bit kernels
  [PARISC] Handle wrapping in expand_upwards()
  [PARISC] stop lcd driver from stripping initial whitespace

4 files changed, 43 insertions, 16 deletions

diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index e70f57e27643..322167737de7 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -16,6 +16,8 @@
 
 #include <asm/uaccess.h>
 #include <asm/assembly.h>
+#include <asm/asm-offsets.h>
+#include <asm/ptrace.h>
 
 #include <asm/unwind.h>
 
@@ -26,6 +28,8 @@
 #define dbg(x...)
 #endif
 
+#define KERNEL_START (KERNEL_BINARY_TEXT_START - 0x1000)
+
 extern struct unwind_table_entry __start___unwind[];
 extern struct unwind_table_entry __stop___unwind[];
 
@@ -197,6 +201,29 @@ static int unwind_init(void)
         return 0;
 }
 
+#ifdef CONFIG_64BIT
+#define get_func_addr(fptr) fptr[2]
+#else
+#define get_func_addr(fptr) fptr[0]
+#endif
+
+static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)
+{
+        void handle_interruption(int, struct pt_regs *);
+        static unsigned long *hi = (unsigned long)&handle_interruption;
+
+        if (pc == get_func_addr(hi)) {
+                struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);
+                dbg("Unwinding through handle_interruption()\n");
+                info->prev_sp = regs->gr[30];
+                info->prev_ip = regs->iaoq[0];
+
+                return 1;
+        }
+
+        return 0;
+}
+
 static void unwind_frame_regs(struct unwind_frame_info *info)
 {
         const struct unwind_table_entry *e;
@@ -310,13 +337,15 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
                         }
                 }
 
-                info->prev_sp = info->sp - frame_size;
-                if (e->Millicode)
-                        info->rp = info->r31;
-                else if (rpoffset)
-                        info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
-                info->prev_ip = info->rp;
-                info->rp = 0;
+                if (!unwind_special(info, e->region_start, frame_size)) {
+                        info->prev_sp = info->sp - frame_size;
+                        if (e->Millicode)
+                                info->rp = info->r31;
+                        else if (rpoffset)
+                                info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
+                        info->prev_ip = info->rp;
+                        info->rp = 0;
+                }
 
                 dbg("analyzing func @ %lx, setting prev_sp=%lx "
                     "prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp, 
diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c
index 98be2880757d..e5d7ed92d6f7 100644
--- a/drivers/parisc/led.c
+++ b/drivers/parisc/led.c
@@ -195,12 +195,6 @@ static int led_proc_write(struct file *file, const char *buf,
 
         cur = lbuf;
 
-        /* skip initial spaces */
-        while (*cur && isspace(*cur))
-        {
-                cur++;
-        }
-
         switch ((long)data)
         {
         case LED_NOLCD:
diff --git a/include/asm-parisc/system.h b/include/asm-parisc/system.h
index 7e9afa720d43..21fbfc5afd02 100644
--- a/include/asm-parisc/system.h
+++ b/include/asm-parisc/system.h
@@ -188,7 +188,6 @@ static inline void set_eiem(unsigned long val)
 # define __lock_aligned __attribute__((__section__(".data.lock_aligned")))
 #endif
 
-#define KERNEL_START (0x10100000 - 0x1000)
 #define arch_align_stack(x) (x)
 
 #endif
diff --git a/mm/mmap.c b/mm/mmap.c
index 68b9ad2ef1d6..906ed402f7ca 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1536,9 +1536,14 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
          * vma->vm_start/vm_end cannot change under us because the caller
          * is required to hold the mmap_sem in read mode.  We need the
          * anon_vma lock to serialize against concurrent expand_stacks.
+         * Also guard against wrapping around to address 0.
          */
-        address += 4 + PAGE_SIZE - 1;
-        address &= PAGE_MASK;
+        if (address < PAGE_ALIGN(address+4))
+                address = PAGE_ALIGN(address+4);
+        else {
+                anon_vma_unlock(vma);
+                return -ENOMEM;
+        }
         error = 0;
 
         /* Somebody else might have raced and expanded it already */