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-rw-r--r--arch/arm/kernel/calls.S2
-rw-r--r--arch/arm/kernel/irq.c6
-rw-r--r--arch/arm/kernel/process.c77
-rw-r--r--arch/arm/kernel/unwind.c19
-rw-r--r--arch/arm/kernel/vmlinux.lds.S8
5 files changed, 72 insertions, 40 deletions
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 1680e9e9c83..f776e72a4cb 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 6874c7dca75..096f600dc8d 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 1585423699e..39196dff478 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 1dedc2c7ff4..dd56e11f339 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 6c077979254..4340bf3d2c8 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)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 04:32:52 +0000