Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (49 commits)
  [ARM] idle: clean up pm_idle calling, obey hlt_counter
  [ARM] S3C: Fix gpio-config off-by-one bug
  [ARM] S3C64XX: add to_irq() support for EINT() GPIO
  [ARM] S3C64XX: clock.c: fix typo in usb-host clock ctrlbit
  [ARM] S3C64XX: fix HCLK gate defines
  [ARM] Update mach-types
  [ARM] wire up rt_tgsigqueueinfo and perf_counter_open
  OMAP2 clock/powerdomain: off by 1 error in loop timeout comparisons
  OMAP3 SDRC: set FIXEDDELAY when disabling SDRC DLL
  OMAP3: Add support for DPLL3 divisor values higher than 2
  OMAP3 SRAM: convert SRAM code to use macros rather than magic numbers
  OMAP3 SRAM: add more comments on the SRAM code
  OMAP3 clock/SDRC: program SDRC_MR register during SDRC clock change
  OMAP3 clock: add a short delay when lowering CORE clk rate
  OMAP3 clock: initialize SDRC timings at kernel start
  OMAP3 clock: remove wait for DPLL3 M2 clock to stabilize
  [ARM] Add old Feroceon support to compressed/head.S
  [ARM] 5559/1: Limit the stack unwinding caused by a kthread exit
  [ARM] 5558/1: Add extra checks to ARM unwinder to avoid tracing corrupt stacks
  [ARM] 5557/1: Discard some ARM.ex*.*exit.text sections when !HOTPLUG or !HOTPLUG_CPU
  ...

5 files changed, 72 insertions, 40 deletions

diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 1680e9e9c831..f776e72a4cb8 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -372,6 +372,8 @@
 /* 360 */       CALL(sys_inotify_init1)
                 CALL(sys_preadv)
                 CALL(sys_pwritev)
+                CALL(sys_rt_tgsigqueueinfo)
+                CALL(sys_perf_counter_open)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 6874c7dca75a..096f600dc8d8 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -167,7 +167,7 @@ void __init init_IRQ(void)
 
 #ifdef CONFIG_SMP
         cpumask_setall(bad_irq_desc.affinity);
-        bad_irq_desc.cpu = smp_processor_id();
+        bad_irq_desc.node = smp_processor_id();
 #endif
         init_arch_irq();
 }
@@ -176,7 +176,7 @@ void __init init_IRQ(void)
 
 static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
 {
-        pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu);
+        pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->node, cpu);
 
         spin_lock_irq(&desc->lock);
         desc->chip->set_affinity(irq, cpumask_of(cpu));
@@ -195,7 +195,7 @@ void migrate_irqs(void)
         for (i = 0; i < NR_IRQS; i++) {
                 struct irq_desc *desc = irq_desc + i;
 
-                if (desc->cpu == cpu) {
+                if (desc->node == cpu) {
                         unsigned int newcpu = cpumask_any_and(desc->affinity,
                                                               cpu_online_mask);
                         if (newcpu >= nr_cpu_ids) {
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 1585423699ee..39196dff478c 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -114,9 +114,6 @@ void arm_machine_restart(char mode, const char *cmd)
 /*
  * Function pointers to optional machine specific functions
  */
-void (*pm_idle)(void);
-EXPORT_SYMBOL(pm_idle);
-
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
@@ -130,20 +127,19 @@ EXPORT_SYMBOL_GPL(arm_pm_restart);
  */
 static void default_idle(void)
 {
-        if (hlt_counter)
-                cpu_relax();
-        else {
-                local_irq_disable();
-                if (!need_resched())
-                        arch_idle();
-                local_irq_enable();
-        }
+        if (!need_resched())
+                arch_idle();
+        local_irq_enable();
 }
 
+void (*pm_idle)(void) = default_idle;
+EXPORT_SYMBOL(pm_idle);
+
 /*
- * The idle thread.  We try to conserve power, while trying to keep
- * overall latency low.  The architecture specific idle is passed
- * a value to indicate the level of "idleness" of the system.
+ * The idle thread, has rather strange semantics for calling pm_idle,
+ * but this is what x86 does and we need to do the same, so that
+ * things like cpuidle get called in the same way.  The only difference
+ * is that we always respect 'hlt_counter' to prevent low power idle.
  */
 void cpu_idle(void)
 {
@@ -151,21 +147,31 @@ void cpu_idle(void)
 
         /* endless idle loop with no priority at all */
         while (1) {
-                void (*idle)(void) = pm_idle;
-
+                tick_nohz_stop_sched_tick(1);
+                leds_event(led_idle_start);
+                while (!need_resched()) {
 #ifdef CONFIG_HOTPLUG_CPU
-                if (cpu_is_offline(smp_processor_id())) {
-                        leds_event(led_idle_start);
-                        cpu_die();
-                }
+                        if (cpu_is_offline(smp_processor_id()))
+                                cpu_die();
 #endif
 
-                if (!idle)
-                        idle = default_idle;
-                leds_event(led_idle_start);
-                tick_nohz_stop_sched_tick(1);
-                while (!need_resched())
-                        idle();
+                        local_irq_disable();
+                        if (hlt_counter) {
+                                local_irq_enable();
+                                cpu_relax();
+                        } else {
+                                stop_critical_timings();
+                                pm_idle();
+                                start_critical_timings();
+                                /*
+                                 * This will eventually be removed - pm_idle
+                                 * functions should always return with IRQs
+                                 * enabled.
+                                 */
+                                WARN_ON(irqs_disabled());
+                                local_irq_enable();
+                        }
+                }
                 leds_event(led_idle_end);
                 tick_nohz_restart_sched_tick();
                 preempt_enable_no_resched();
@@ -352,6 +358,23 @@ asm(	".section .text\n"
 "       .size   kernel_thread_helper, . - kernel_thread_helper\n"
 "       .previous");
 
+#ifdef CONFIG_ARM_UNWIND
+extern void kernel_thread_exit(long code);
+asm(    ".section .text\n"
+"       .align\n"
+"       .type   kernel_thread_exit, #function\n"
+"kernel_thread_exit:\n"
+"       .fnstart\n"
+"       .cantunwind\n"
+"       bl      do_exit\n"
+"       nop\n"
+"       .fnend\n"
+"       .size   kernel_thread_exit, . - kernel_thread_exit\n"
+"       .previous");
+#else
+#define kernel_thread_exit      do_exit
+#endif
+
 /*
  * Create a kernel thread.
  */
@@ -363,7 +386,7 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 
         regs.ARM_r1 = (unsigned long)arg;
         regs.ARM_r2 = (unsigned long)fn;
-        regs.ARM_r3 = (unsigned long)do_exit;
+        regs.ARM_r3 = (unsigned long)kernel_thread_exit;
         regs.ARM_pc = (unsigned long)kernel_thread_helper;
         regs.ARM_cpsr = SVC_MODE | PSR_ENDSTATE;
 
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 1dedc2c7ff49..dd56e11f339a 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -212,7 +212,8 @@ static int unwind_exec_insn(struct unwind_ctrl_block *ctrl)
                         ctrl->vrs[14] = *vsp++;
                 ctrl->vrs[SP] = (unsigned long)vsp;
         } else if (insn == 0xb0) {
-                ctrl->vrs[PC] = ctrl->vrs[LR];
+                if (ctrl->vrs[PC] == 0)
+                        ctrl->vrs[PC] = ctrl->vrs[LR];
                 /* no further processing */
                 ctrl->entries = 0;
         } else if (insn == 0xb1) {
@@ -309,18 +310,20 @@ int unwind_frame(struct stackframe *frame)
         }
 
         while (ctrl.entries > 0) {
-                int urc;
-
-                if (ctrl.vrs[SP] < low || ctrl.vrs[SP] >= high)
-                        return -URC_FAILURE;
-                urc = unwind_exec_insn(&ctrl);
+                int urc = unwind_exec_insn(&ctrl);
                 if (urc < 0)
                         return urc;
+                if (ctrl.vrs[SP] < low || ctrl.vrs[SP] >= high)
+                        return -URC_FAILURE;
         }
 
         if (ctrl.vrs[PC] == 0)
                 ctrl.vrs[PC] = ctrl.vrs[LR];
 
+        /* check for infinite loop */
+        if (frame->pc == ctrl.vrs[PC])
+                return -URC_FAILURE;
+
         frame->fp = ctrl.vrs[FP];
         frame->sp = ctrl.vrs[SP];
         frame->lr = ctrl.vrs[LR];
@@ -332,7 +335,6 @@ int unwind_frame(struct stackframe *frame)
 void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 {
         struct stackframe frame;
-        unsigned long high, low;
         register unsigned long current_sp asm ("sp");
 
         pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
@@ -362,9 +364,6 @@ void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
                 frame.pc = thread_saved_pc(tsk);
         }
 
-        low = frame.sp & ~(THREAD_SIZE - 1);
-        high = low + THREAD_SIZE;
-
         while (1) {
                 int urc;
                 unsigned long where = frame.pc;
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 6c0779792546..4340bf3d2c84 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -84,6 +84,14 @@ SECTIONS
                 *(.exitcall.exit)
                 *(.ARM.exidx.exit.text)
                 *(.ARM.extab.exit.text)
+#ifndef CONFIG_HOTPLUG_CPU
+                *(.ARM.exidx.cpuexit.text)
+                *(.ARM.extab.cpuexit.text)
+#endif
+#ifndef CONFIG_HOTPLUG
+                *(.ARM.exidx.devexit.text)
+                *(.ARM.extab.devexit.text)
+#endif
 #ifndef CONFIG_MMU
                 *(.fixup)
                 *(__ex_table)