Commit 69a7d1b3 authored by Wu Zhangjin's avatar Wu Zhangjin Committed by Ralf Baechle
Browse files

MIPS: Tracing: Enable HAVE_FUNCTION_TRACE_MCOUNT_TEST for MIPS 



There is an exisiting common ftrace_test_stop_func() in
kernel/trace/ftrace.c, which is used to check the global variable
ftrace_trace_stop to determine whether stop the function tracing.

This patch implepment the MIPS specific one to speedup the procedure.

Thanks goes to Zhang Le for Cleaning it up.

Signed-off-by: default avatarWu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: zhangfx@lemote.com
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/673/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent d2bb0762

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ config MIPS 
	select HAVE_OPROFILE

	select HAVE_ARCH_KGDB

	select HAVE_FUNCTION_TRACER

	select HAVE_FUNCTION_TRACE_MCOUNT_TEST

	# Horrible source of confusion.  Die, die, die ...

	select EMBEDDED

	select RTC_LIB if !MACH_LOONGSON

arch/mips/kernel/mcount.S

+3 −0
Original line number Diff line number Diff line
@@ -59,6 +59,9 @@ 
	.endm



NESTED(_mcount, PT_SIZE, ra)

	lw	t0, function_trace_stop

	bnez	t0, ftrace_stub

	 nop

	PTR_LA	t0, ftrace_stub

	PTR_L	t1, ftrace_trace_function /* Prepare t1 for (1) */

	bne	t0, t1, static_trace