From mboxrd@z Thu Jan 1 00:00:00 1970 From: nicolas.pitre@linaro.org (Nicolas Pitre) Date: Mon, 23 Sep 2013 19:17:55 -0400 Subject: [PATCH 12/13] ARM: bL_switcher/trace: Add kernel trace trigger interface In-Reply-To: <1379978276-31241-1-git-send-email-nicolas.pitre@linaro.org> References: <1379978276-31241-1-git-send-email-nicolas.pitre@linaro.org> Message-ID: <1379978276-31241-13-git-send-email-nicolas.pitre@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Dave Martin 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 --- 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