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| author | Matt Fleming <matt@console-pimps.org> | 2009-06-28 17:05:44 +0400 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-07-06 14:53:53 +0400 |
| commit | c1340c053be7a43d837a3acb352d5008be865a55 (patch) | |
| tree | b88104b3a2373d58465057eae38885b66315b3c0 | |
| parent | ca0d17277fd101ce4878f92b398b6ab71fb2c287 (diff) | |
| download | linux-c1340c053be7a43d837a3acb352d5008be865a55.tar.xz | |
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>
| -rw-r--r-- | arch/sh/Kconfig | 1 | ||||
| -rw-r--r-- | arch/sh/lib/mcount.S | 17 |
2 files changed, 17 insertions, 1 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index e2bdd7b94fd9..801a4a79ffe3 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -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 diff --git a/arch/sh/lib/mcount.S b/arch/sh/lib/mcount.S index 110fbfe1831f..cb87ef580b31 100644 --- a/arch/sh/lib/mcount.S +++ b/arch/sh/lib/mcount.S @@ -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 |