x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o
authorSteven Rostedt (VMware) <rostedt@goodmis.org>
Thu, 23 Mar 2017 14:33:53 +0000 (10:33 -0400)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 24 Mar 2017 09:14:08 +0000 (10:14 +0100)
commit1fa9d67a2f07893fc7e4a880867a6cbb81dda547
treeb91313082fbb3b6956e8d704a62f14af1b99868e
parent644e0e8dc76b919976c44d3929164d42cbe656bc
x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o

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.

Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20170316210043.peycxdxktwwn6cid@treble
Link: http://lkml.kernel.org/r/20170323143446.217684991@goodmis.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/kernel/Makefile
arch/x86/kernel/ftrace_32.S
arch/x86/kernel/ftrace_64.S