summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorFrederic Weisbecker <fweisbec@gmail.com>2008-12-09 23:54:20 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-12 11:14:08 +0100
commitbcbc4f20b52c2c40c43a4d2337707dcdfe81bc3a (patch)
tree897774cc2f53691b2736e3d1dbadc9d1e263d47a
parenta0343e823184070f55364d8359f832dcb33c57c7 (diff)
downloadop-kernel-dev-bcbc4f20b52c2c40c43a4d2337707dcdfe81bc3a.zip
op-kernel-dev-bcbc4f20b52c2c40c43a4d2337707dcdfe81bc3a.tar.gz
tracing/function-graph-tracer: annotate do_IRQ and smp_apic_timer_interrupt
Impact: move most important x86 irq entry-points to a separate subsection Annotate do_IRQ and smp_apic_timer_interrupt to put them into the .irqentry.text subsection. These function will so be recognized as hardirq entrypoints for the function-graph-tracer. We could also annotate other irq entries but the others are far less important but they can be added on request. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/kernel/apic.c3
-rw-r--r--arch/x86/kernel/irq_64.c3
-rw-r--r--include/linux/ftrace.h11
3 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index 16f9487..b946ac1 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -30,6 +30,7 @@
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/dmar.h>
+#include <linux/ftrace.h>
#include <asm/atomic.h>
#include <asm/smp.h>
@@ -800,7 +801,7 @@ static void local_apic_timer_interrupt(void)
* [ if a single-CPU system runs an SMP kernel then we call the local
* interrupt as well. Thus we cannot inline the local irq ... ]
*/
-void smp_apic_timer_interrupt(struct pt_regs *regs)
+void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 60eb84e..11c65e8 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -13,6 +13,7 @@
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/delay.h>
+#include <linux/ftrace.h>
#include <asm/uaccess.h>
#include <asm/io_apic.h>
#include <asm/idle.h>
@@ -47,7 +48,7 @@ static inline void stack_overflow_check(struct pt_regs *regs)
* SMP cross-CPU interrupts have their own specific
* handlers).
*/
-asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
+asmlinkage unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct irq_desc *desc;
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 11cac81..44020f3 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -377,6 +377,16 @@ struct ftrace_graph_ret {
*/
#define __notrace_funcgraph notrace
+/*
+ * We want to which function is an entrypoint of a hardirq.
+ * That will help us to put a signal on output.
+ */
+#define __irq_entry __attribute__((__section__(".irqentry.text")))
+
+/* Limits of hardirq entrypoints */
+extern char __irqentry_text_start[];
+extern char __irqentry_text_end[];
+
#define FTRACE_RETFUNC_DEPTH 50
#define FTRACE_RETSTACK_ALLOC_SIZE 32
/* Type of the callback handlers for tracing function graph*/
@@ -414,6 +424,7 @@ static inline void unpause_graph_tracing(void)
#else
#define __notrace_funcgraph
+#define __irq_entry
static inline void ftrace_graph_init_task(struct task_struct *t) { }
static inline void ftrace_graph_exit_task(struct task_struct *t) { }
OpenPOWER on IntegriCloud