[PATCH 12/13] ARM: bL_switcher/trace: Add kernel trace trigger interface
Nicolas Pitre
nicolas.pitre at linaro.org
Mon Sep 23 19:17:55 EDT 2013
From: Dave Martin <dave.martin at linaro.org>
This patch exports a bL_switcher_trace_trigger() function to
provide a means for drivers using the trace events to get the
current status when starting a trace session.
Calling this function is equivalent to pinging the trace_trigger
file in sysfs.
Signed-off-by: Dave Martin <dave.martin at linaro.org>
---
arch/arm/common/bL_switcher.c | 3 ++-
arch/arm/include/asm/bL_switcher.h | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c
index f0dc025077..f4878a3604 100644
--- a/arch/arm/common/bL_switcher.c
+++ b/arch/arm/common/bL_switcher.c
@@ -537,7 +537,7 @@ static void bL_switcher_trace_trigger_cpu(void *__always_unused info)
trace_cpu_migrate_current(get_ns(), read_mpidr());
}
-static int bL_switcher_trace_trigger(void)
+int bL_switcher_trace_trigger(void)
{
int ret;
@@ -550,6 +550,7 @@ static int bL_switcher_trace_trigger(void)
return ret;
}
+EXPORT_SYMBOL_GPL(bL_switcher_trace_trigger);
static int bL_switcher_enable(void)
{
diff --git a/arch/arm/include/asm/bL_switcher.h b/arch/arm/include/asm/bL_switcher.h
index 7d1cce8b8a..8ada5a885c 100644
--- a/arch/arm/include/asm/bL_switcher.h
+++ b/arch/arm/include/asm/bL_switcher.h
@@ -54,6 +54,8 @@ int bL_switcher_unregister_notifier(struct notifier_block *nb);
bool bL_switcher_get_enabled(void);
void bL_switcher_put_enabled(void);
+int bL_switcher_trace_trigger(void);
+
#else
static inline int bL_switcher_register_notifier(struct notifier_block *nb)
{
@@ -67,6 +69,7 @@ static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
static inline bool bL_switcher_get_enabled(void) { return false; }
static inline void bL_switcher_put_enabled(void) { }
+static inline int bL_switcher_trace_trigger(void) { return 0; }
#endif /* CONFIG_BL_SWITCHER */
#endif
--
1.8.4.98.gb022869
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