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ARM: bL_switcher/trace: Add kernel trace trigger interface

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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@linaro.org>
This commit is contained in:
Dave Martin 2013-02-11 14:39:19 +00:00 committed by Nicolas Pitre
parent b09bbe5b12
commit 29064b8846
2 changed files with 5 additions and 1 deletions
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3
arch/arm/common/bL_switcher.c
View file

@ -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)
{

3
arch/arm/include/asm/bL_switcher.h
View file

@ -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