Re: [PATCH -v6 05/13] tracing: enable HAVE_FUNCTION_TRACE_MCOUNT_TESTfor MIPS
From: Sergei Shtylyov
Date: Mon Oct 26 2009 - 11:42:19 EST
Hello.
Wu Zhangjin wrote:
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@xxxxxxxxx>
[...]
diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S
index 0c39bc8..5dfaca8 100644
--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -64,6 +64,10 @@
.endm
NESTED(_mcount, PT_SIZE, ra)
+ lw t0, function_trace_stop
+ bnez t0, ftrace_stub
+ nop
1) unless .set noreorder is specified in this file, explicit nop is not needed;
2) delay slot instruction is usually denoted by adding extra space on its
left, like this:
bnez t0, ftrace_stub
nop
WBR, Sergei
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