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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 6/6 v3] ftrace/x86: Use Makefile logic instead of #ifdef of compling ftrace_*.o
Date: Sat, 18 Mar 2017 17:09:29 -0400	[thread overview]
Message-ID: <20170318211149.740427022@goodmis.org> (raw)
In-Reply-To: 20170318210923.814509382@goodmis.org

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[-- Type: text/plain, Size: 2759 bytes --]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Currently ftrace_32.S and ftrace_64.S are compiled even when
CONFIG_FUNCTION_TRACER is not set. This means there's an unnecessary #ifdef
to protect the code. Instead of using preprocessor directives, only compile
those files when FUNCTION_TRACER is defined.

Link: http://lkml.kernel.org/r/20170316210043.peycxdxktwwn6cid@treble
Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 arch/x86/kernel/Makefile    | 4 ++--
 arch/x86/kernel/ftrace_32.S | 3 ---
 arch/x86/kernel/ftrace_64.S | 4 ----
 3 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 55e8902c461f..4b994232cb57 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -46,8 +46,7 @@ obj-$(CONFIG_MODIFY_LDT_SYSCALL)	+= ldt.o
 obj-y			+= setup.o x86_init.o i8259.o irqinit.o jump_label.o
 obj-$(CONFIG_IRQ_WORK)  += irq_work.o
 obj-y			+= probe_roms.o
-obj-$(CONFIG_X86_64)	+= sys_x86_64.o ftrace_64.o
-obj-$(CONFIG_X86_32)	+= ftrace_32.o
+obj-$(CONFIG_X86_64)	+= sys_x86_64.o
 obj-$(CONFIG_X86_ESPFIX64)	+= espfix_64.o
 obj-$(CONFIG_SYSFS)	+= ksysfs.o
 obj-y			+= bootflag.o e820.o
@@ -83,6 +82,7 @@ obj-y				+= apic/
 obj-$(CONFIG_X86_REBOOTFIXUPS)	+= reboot_fixups_32.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= ftrace.o
 obj-$(CONFIG_LIVEPATCH)	+= livepatch.o
+obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace_$(BITS).o
 obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
 obj-$(CONFIG_FTRACE_SYSCALLS)	+= ftrace.o
 obj-$(CONFIG_X86_TSC)		+= trace_clock.o
diff --git a/arch/x86/kernel/ftrace_32.S b/arch/x86/kernel/ftrace_32.S
index fe64fa596266..4d52e0d49e26 100644
--- a/arch/x86/kernel/ftrace_32.S
+++ b/arch/x86/kernel/ftrace_32.S
@@ -10,8 +10,6 @@
 #include <asm/export.h>
 #include <asm/ftrace.h>
 
-#ifdef CONFIG_FUNCTION_TRACER
-
 #ifdef CC_USING_FENTRY
 # define function_hook	__fentry__
 EXPORT_SYMBOL(__fentry__)
@@ -208,7 +206,6 @@ ftrace_stub:
 	jmp	ftrace_stub
 END(function_hook)
 #endif /* CONFIG_DYNAMIC_FTRACE */
-#endif /* CONFIG_FUNCTION_TRACER */
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 ENTRY(ftrace_graph_caller)
diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S
index 7b0d3da52fb4..b9c46919d4fc 100644
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -13,9 +13,6 @@
 	.code64
 	.section .entry.text, "ax"
 
-
-#ifdef CONFIG_FUNCTION_TRACER
-
 #ifdef CC_USING_FENTRY
 # define function_hook	__fentry__
 EXPORT_SYMBOL(__fentry__)
@@ -297,7 +294,6 @@ trace:
 	jmp fgraph_trace
 END(function_hook)
 #endif /* CONFIG_DYNAMIC_FTRACE */
-#endif /* CONFIG_FUNCTION_TRACER */
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 ENTRY(ftrace_graph_caller)
-- 
2.10.2

  parent reply	other threads:[~2017-03-18 21:12 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-18 21:09 [PATCH 0/6 v3] [GIT PULL] ftrace/x86: Ftrace cleanup and add support for -mfentry on x86_32 Steven Rostedt
2017-03-18 21:09 ` [PATCH 1/6 v3] ftrace/x86_64: Rename mcount_64.S to ftrace_64.S Steven Rostedt
2017-03-18 21:09 ` [PATCH 2/6 v3] ftrace/x86_32: Move the ftrace specific code out of entry_32.S Steven Rostedt
2017-03-18 21:09 ` [PATCH 3/6 v3] ftrace/x86_32: Add stack frame pointer to ftrace_caller Steven Rostedt
2017-03-18 21:09 ` [PATCH 4/6 v3] ftrace/x86_32: Clean up ftrace_regs_caller Steven Rostedt
2017-03-20 14:01   ` Josh Poimboeuf
2017-03-18 21:09 ` [PATCH 5/6 v3] ftrace/x86_32: Add -mfentry support to x86_32 with DYNAMIC_FTRACE set Steven Rostedt
2017-03-20 14:02   ` Josh Poimboeuf
2017-03-18 21:09 ` Steven Rostedt [this message]
2017-03-20 14:04   ` [PATCH 6/6 v3] ftrace/x86: Use Makefile logic instead of #ifdef of compling ftrace_*.o Josh Poimboeuf
2017-03-22  0:56     ` Steven Rostedt

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