sparc64,ftrace: Remove check of obsolete variable function_trace_stop

Nothing sets function_trace_stop to disable function tracing anymore.
Remove the check for it in the arch code.

Link: http://lkml.kernel.org/r/20140703.211820.1674895115102216877.davem@davemloft.net

Cc: David S. Miller <davem@davemloft.net>
OKed-to-go-through-tracing-tree-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

arch/sparc/Kconfig

@@ -55,7 +55,6 @@ config SPARC64
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_GRAPH_FP_TEST
-	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
 	select HAVE_KRETPROBES
 	select HAVE_KPROBES
 	select HAVE_RCU_TABLE_FREE if SMP

arch/sparc/lib/mcount.S

@@ -24,10 +24,7 @@ mcount:
 #ifdef CONFIG_DYNAMIC_FTRACE
 	/* Do nothing, the retl/nop below is all we need.  */
 #else
-	sethi		%hi(function_trace_stop), %g1
-	lduw		[%g1 + %lo(function_trace_stop)], %g2
-	brnz,pn		%g2, 2f
-	 sethi		%hi(ftrace_trace_function), %g1
+	sethi		%hi(ftrace_trace_function), %g1
 	sethi		%hi(ftrace_stub), %g2
 	ldx		[%g1 + %lo(ftrace_trace_function)], %g1
 	or		%g2, %lo(ftrace_stub), %g2
@@ -80,11 +77,8 @@ ftrace_stub:
 	.globl		ftrace_caller
 	.type		ftrace_caller,#function
 ftrace_caller:
-	sethi		%hi(function_trace_stop), %g1
 	mov		%i7, %g2
-	lduw		[%g1 + %lo(function_trace_stop)], %g1
-	brnz,pn		%g1, ftrace_stub
-	 mov		%fp, %g3
+	mov		%fp, %g3
 	save		%sp, -176, %sp
 	mov		%g2, %o1
 	mov		%g2, %l0