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sh: Define HAVE_FUNCTION_TRACE_MCOUNT_TEST 

Enable HAVE_FUNCTION_TRACE_MCOUNT_TEST and test the value of
function_trace_stop from our assembly code as opposed to using the
generic C function. This should optimise our mcount/ftrace code path.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Matt Fleming 2009-06-28 14:05:44 +01:00 committed by Paul Mundt
parent ca0d17277f
commit c1340c053b
2 changed files with 17 additions and 1 deletions
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1
arch/sh/Kconfig
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@ -31,6 +31,7 @@ config SUPERH32
select HAVE_FUNCTION_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_ARCH_KGDB
select ARCH_HIBERNATION_POSSIBLE if MMU

17
arch/sh/lib/mcount.S
View File

@ -2,7 +2,7 @@
* arch/sh/lib/mcount.S
*
* Copyright (C) 2008 Paul Mundt
* Copyright (C) 2008 Matt Fleming
* Copyright (C) 2008, 2009 Matt Fleming
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@ -35,6 +35,12 @@
.type mcount,@function
_mcount:
mcount:
#ifndef CONFIG_DYNAMIC_FTRACE
mov.l .Lfunction_trace_stop, r0
mov.l @r0, r0
tst r0, r0
bf ftrace_stub
#endif
MCOUNT_ENTER()
#ifdef CONFIG_DYNAMIC_FTRACE
@ -62,6 +68,11 @@ skip_trace:
#ifdef CONFIG_DYNAMIC_FTRACE
.globl ftrace_caller
ftrace_caller:
mov.l .Lfunction_trace_stop, r0
mov.l @r0, r0
tst r0, r0
bf ftrace_stub
MCOUNT_ENTER()
.globl ftrace_call
@ -88,3 +99,7 @@ ftrace_call:
ftrace_stub:
rts
nop
.align 2
.Lfunction_trace_stop:
.long function_trace_stop