arm: tracing: disable tracing for the timer clock functions

The function graph tracer causes a kernel crash when enabled. This is
because the counter_get_cntvct_cp15 and the trace_local_clock functions
call each other recursively causing a kernel stack overflow. Fix this
by annotating the timer clock functions with notrace.

Change-Id: I89864012cf98054265ac8c5ed1fb4870ca00c5a4
CRs-Fixed: 525920
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>

arch/arm/include/asm/arch_timer.h

@@ -90,7 +90,7 @@ static inline u64 arch_counter_get_cntpct_cp15(void)
 	return cval;
 }
 
-static inline u64 arch_counter_get_cntvct_cp15(void)
+static notrace inline u64 arch_counter_get_cntvct_cp15(void)
 {
 	u64 cval;
 

arch/arm/kernel/arch_timer.c

@@ -22,7 +22,7 @@ static unsigned long arch_timer_read_counter_long(void)
 	return arch_timer_read_counter();
 }
 
-static u32 arch_timer_read_counter_u32(void)
+static notrace u32 arch_timer_read_counter_u32(void)
 {
 	return arch_timer_read_counter();
 }

drivers/clocksource/arm_arch_timer.c

@@ -377,7 +377,7 @@ static u64 arch_counter_get_cntpct_mem(void)
 	return ((u64) pct_hi << 32) | pct_lo;
 }
 
-static u64 arch_counter_get_cntvct_mem(void)
+static notrace u64 arch_counter_get_cntvct_mem(void)
 {
 	u32 vct_lo, vct_hi, tmp_hi;