Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6

* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6:
  [PATCH] x86-64: Use stricter in process stack check for unwinder
  [PATCH] i386: Fix compilation with UP genericarch
  [PATCH] x86-64: Fix warning in io_apic.c
  [PATCH] x86-64: work around gcc4 issue with -Os in Dwarf2 stack unwind
  [PATCH] x86_64: Align data segment to PAGE_SIZE boundary

4 files changed, 18 insertions, 7 deletions

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 14654e682411..c80081a6ba41 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -754,10 +754,8 @@ void __setup_vector_irq(int cpu)
 {
         /* Initialize vector_irq on a new cpu */
         /* This function must be called with vector_lock held */
-        unsigned long flags;
         int irq, vector;
 
-
         /* Mark the inuse vectors */
         for (irq = 0; irq < NR_IRQ_VECTORS; ++irq) {
                 if (!cpu_isset(cpu, irq_domain[irq]))
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index a153d0a01b72..0d65b22f229c 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -242,12 +242,19 @@ static int dump_trace_unwind(struct unwind_frame_info *info, void *context)
  * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
  */
 
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+{
+        void *t = (void *)tinfo;
+        return p > t && p < t + THREAD_SIZE - 3;
+}
+
 void dump_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * stack,
                 struct stacktrace_ops *ops, void *data)
 {
         const unsigned cpu = smp_processor_id();
         unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
         unsigned used = 0;
+        struct thread_info *tinfo;
 
         if (!tsk)
                 tsk = current;
@@ -370,7 +377,8 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
         /*
          * This handles the process stack:
          */
-        HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
+        tinfo = current_thread_info();
+        HANDLE_STACK (valid_stack_ptr(tinfo, stack));
 #undef HANDLE_STACK
 }
 EXPORT_SYMBOL(dump_trace);
diff --git a/include/asm-i386/mach-summit/mach_apic.h b/include/asm-i386/mach-summit/mach_apic.h
index ef0671e5d5c5..43e5bd8f4a19 100644
--- a/include/asm-i386/mach-summit/mach_apic.h
+++ b/include/asm-i386/mach-summit/mach_apic.h
@@ -88,7 +88,11 @@ static inline void clustered_apic_check(void)
 
 static inline int apicid_to_node(int logical_apicid)
 {
+#ifdef CONFIG_SMP
         return apicid_2_node[hard_smp_processor_id()];
+#else
+        return 0;
+#endif
 }
 
 /* Mapping from cpu number to logical apicid */
diff --git a/kernel/unwind.c b/kernel/unwind.c
index f7e50d16dbf6..ed0a21d4a902 100644
--- a/kernel/unwind.c
+++ b/kernel/unwind.c
@@ -938,8 +938,11 @@ int unwind(struct unwind_frame_info *frame)
                 else {
                         retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end);
                         /* skip augmentation */
-                        if (((const char *)(cie + 2))[1] == 'z')
-                                ptr += get_uleb128(&ptr, end);
+                        if (((const char *)(cie + 2))[1] == 'z') {
+                                uleb128_t augSize = get_uleb128(&ptr, end);
+
+                                ptr += augSize;
+                        }
                         if (ptr > end
                            || retAddrReg >= ARRAY_SIZE(reg_info)
                            || REG_INVALID(retAddrReg)
@@ -963,9 +966,7 @@ int unwind(struct unwind_frame_info *frame)
         if (cie == NULL || fde == NULL) {
 #ifdef CONFIG_FRAME_POINTER
                 unsigned long top, bottom;
-#endif
 
-#ifdef CONFIG_FRAME_POINTER
                 top = STACK_TOP(frame->task);
                 bottom = STACK_BOTTOM(frame->task);
 # if FRAME_RETADDR_OFFSET < 0