MIPS: Tracing: Add IRQENTRY_EXIT section for MIPS
This patch add a new section for MIPS to record the block of the hardirq
handling for function graph tracer(print_graph_irq) via adding the
__irq_entry annotation to the the entrypoints of the hardirqs(the block
with irq_enter()...irq_exit()).
Thanks goes to Steven & Frederic Weisbecker for their feedbacks.
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: zhangfx@lemote.com
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/676/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index a38e3ee..23499b5 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -25,6 +25,7 @@
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
+#include <linux/ftrace.h>
#include <asm/cpu.h>
#include <asm/processor.h>
@@ -939,23 +940,29 @@
DECLARE_PER_CPU(struct clock_event_device, mips_clockevent_device);
-void ipi_decode(struct smtc_ipi *pipi)
+static void __irq_entry smtc_clock_tick_interrupt(void)
{
unsigned int cpu = smp_processor_id();
struct clock_event_device *cd;
+ int irq = MIPS_CPU_IRQ_BASE + 1;
+
+ irq_enter();
+ kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
+ cd = &per_cpu(mips_clockevent_device, cpu);
+ cd->event_handler(cd);
+ irq_exit();
+}
+
+void ipi_decode(struct smtc_ipi *pipi)
+{
void *arg_copy = pipi->arg;
int type_copy = pipi->type;
- int irq = MIPS_CPU_IRQ_BASE + 1;
smtc_ipi_nq(&freeIPIq, pipi);
switch (type_copy) {
case SMTC_CLOCK_TICK:
- irq_enter();
- kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
- cd = &per_cpu(mips_clockevent_device, cpu);
- cd->event_handler(cd);
- irq_exit();
+ smtc_clock_tick_interrupt();
break;
case LINUX_SMP_IPI: