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ftrace: Move ARCH_SUPPORTS_FTRACE_SAVE_REGS in Kconfig

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Move SAVE_REGS support flag into Kconfig and rename
it to CONFIG_DYNAMIC_FTRACE_WITH_REGS. This also introduces
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS which indicates
the architecture depending part of ftrace has a code
that saves full registers.
On the other hand, CONFIG_DYNAMIC_FTRACE_WITH_REGS indicates
the code is enabled.

Link: http://lkml.kernel.org/r/20120928081516.3560.72534.stgit@ltc138.sdl.hitachi.co.jp

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2012-09-28 17:15:17 +09:00 committed by Steven Rostedt
parent 8741db532e
commit 06aeaaeabf
6 changed files with 16 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/Kconfig
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@ -44,6 +44,7 @@ config X86
select HAVE_FENTRY if X86_64
select HAVE_C_RECORDMCOUNT
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_GRAPH_FP_TEST

1
arch/x86/include/asm/ftrace.h
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@ -44,7 +44,6 @@
#ifdef CONFIG_DYNAMIC_FTRACE
#define ARCH_SUPPORTS_FTRACE_OPS 1
#define ARCH_SUPPORTS_FTRACE_SAVE_REGS
#endif
#ifndef __ASSEMBLY__

6
include/linux/ftrace.h
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@ -74,7 +74,7 @@ typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
* SAVE_REGS - The ftrace_ops wants regs saved at each function called
* and passed to the callback. If this flag is set, but the
* architecture does not support passing regs
* (ARCH_SUPPORTS_FTRACE_SAVE_REGS is not defined), then the
* (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
* ftrace_ops will fail to register, unless the next flag
* is set.
* SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
@ -418,7 +418,7 @@ void ftrace_modify_all_code(int command);
#endif
#ifndef FTRACE_REGS_ADDR
#ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
# define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)
#else
# define FTRACE_REGS_ADDR FTRACE_ADDR
@ -480,7 +480,7 @@ extern int ftrace_make_nop(struct module *mod,
*/
extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
#ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
/**
* ftrace_modify_call - convert from one addr to another (no nop)
* @rec: the mcount call site record

8
kernel/trace/Kconfig
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@ -39,6 +39,9 @@ config HAVE_DYNAMIC_FTRACE
help
See Documentation/trace/ftrace-design.txt
config HAVE_DYNAMIC_FTRACE_WITH_REGS
bool
config HAVE_FTRACE_MCOUNT_RECORD
bool
help
@ -434,6 +437,11 @@ config DYNAMIC_FTRACE
were made. If so, it runs stop_machine (stops all CPUS)
and modifies the code to jump over the call to ftrace.
config DYNAMIC_FTRACE_WITH_REGS
def_bool y
depends on DYNAMIC_FTRACE
depends on HAVE_DYNAMIC_FTRACE_WITH_REGS
config FUNCTION_PROFILER
bool "Kernel function profiler"
depends on FUNCTION_TRACER

6
kernel/trace/ftrace.c
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@ -337,7 +337,7 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
if ((ops->flags & FL_GLOBAL_CONTROL_MASK) == FL_GLOBAL_CONTROL_MASK)
return -EINVAL;
#ifndef ARCH_SUPPORTS_FTRACE_SAVE_REGS
#ifndef CONFIG_DYNAMIC_FTRACE_WITH_REGS
/*
* If the ftrace_ops specifies SAVE_REGS, then it only can be used
* if the arch supports it, or SAVE_REGS_IF_SUPPORTED is also set.
@ -4143,8 +4143,8 @@ __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
* Archs are to support both the regs and ftrace_ops at the same time.
* If they support ftrace_ops, it is assumed they support regs.
* If call backs want to use regs, they must either check for regs
* being NULL, or ARCH_SUPPORTS_FTRACE_SAVE_REGS.
* Note, ARCH_SUPPORT_SAVE_REGS expects a full regs to be saved.
* being NULL, or CONFIG_DYNAMIC_FTRACE_WITH_REGS.
* Note, CONFIG_DYNAMIC_FTRACE_WITH_REGS expects a full regs to be saved.
* An architecture can pass partial regs with ftrace_ops and still
* set the ARCH_SUPPORT_FTARCE_OPS.
*/

2
kernel/trace/trace_selftest.c
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@ -568,7 +568,7 @@ trace_selftest_function_regs(void)
int ret;
int supported = 0;
#ifdef ARCH_SUPPORTS_FTRACE_SAVE_REGS
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
supported = 1;
#endif