linux-kernel - [PATCH v9 02/10] tracing: enable HAVE_FUNCTION_TRACE_MCOUNT

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Message-Id: <51e30436a435480f1f0dec146a82f2b250900690.1258719323.git.wuzhangjin@gmail.com>
Date:	Fri, 20 Nov 2009 20:34:30 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>, rostedt@...dmis.org
Cc:	Nicholas Mc Guire <der.herr@...r.at>, zhangfx@...ote.com,
	Wu Zhangjin <wuzhangjin@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: [PATCH v9 02/10] tracing: enable HAVE_FUNCTION_TRACE_MCOUNT_TEST for MIPS

From: Wu Zhangjin <wuzhangjin@...il.com>

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: Wu Zhangjin <wuzhangjin@...il.com>
---
 arch/mips/Kconfig         |    1 +
 arch/mips/kernel/mcount.S |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 6b33e88..a9bd992 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -5,6 +5,7 @@ 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 !LEMOTE_FULOONG2E
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S
index cebcc3c..cbb45ed 100644
--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -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
-- 
1.6.2.1

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