From e4e4fb01a19fa9bff3bec4b398c860aa92110c2e Mon Sep 17 00:00:00 2001
From: Daniel Glaser <7723396+the78mole@users.noreply.github.com>
Date: Fri, 22 May 2020 19:26:41 +0200
Subject: [PATCH] Adding volatile to tasks.c's runtime information to protect
 against compiler optimization (#62)

As discussed in https://forums.freertos.org/t/make-runtime-stats-working-with-compiler-optimization-enabled/9846 and on lined out on https://blog.the78mole.de/freertos-debugging-on-stm32-cpu-usage/, adding the volatile prevents the run-time stats variable being optimized away when used with compiler optimizations.
---
 tasks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tasks.c b/tasks.c
index d63f6ccfd..c057973d1 100644
--- a/tasks.c
+++ b/tasks.c
@@ -393,7 +393,7 @@ PRIVILEGED_DATA static volatile UBaseType_t uxSchedulerSuspended	= ( UBaseType_t
 	/* Do not move these variables to function scope as doing so prevents the
 	code working with debuggers that need to remove the static qualifier. */
 	PRIVILEGED_DATA static uint32_t ulTaskSwitchedInTime = 0UL;	/*< Holds the value of a timer/counter the last time a task was switched in. */
-	PRIVILEGED_DATA static uint32_t ulTotalRunTime = 0UL;		/*< Holds the total amount of execution time as defined by the run time counter clock. */
+	PRIVILEGED_DATA static volatile uint32_t ulTotalRunTime = 0UL;		/*< Holds the total amount of execution time as defined by the run time counter clock. */
 
 #endif