[PATCH] x86/ftrace: Exclude functions in head64.c from function-tracing

From	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Newsgroups	linux.kernel
Subject	[PATCH] x86/ftrace: Exclude functions in head64.c from function-tracing
Date	2017-06-27 14:10 +0200
Message-ID	<tWXtE-hF-13@gated-at.bofh.it> (permalink)
References	<tWPw6-37c-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

We've moved most logic of early boot up from startup_64() written in
assembly to __startup_64() written in C.

Fengguang reported breakage due to the change. It was tracked down to
CONFIG_FUNCTION_TRACER being enabled.

Looks like function-tracing of the new code is harmful.

Let's not comple the code with -pg compiler option.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
---
 arch/x86/kernel/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 4b994232cb57..0db512092f37 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -18,6 +18,7 @@ CFLAGS_REMOVE_pvclock.o = -pg
 CFLAGS_REMOVE_kvmclock.o = -pg
 CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
+CFLAGS_REMOVE_head64.o = -pg
 endif
 
 KASAN_SANITIZE_head$(BITS).o				:= n
-- 
2.11.0

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] x86/ftrace: Exclude functions in head64.c from function-tracing "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-06-27 14:10 +0200
  Re: [PATCH] x86/ftrace: Exclude functions in head64.c from  function-tracing Steven Rostedt <rostedt@goodmis.org> - 2017-06-27 15:40 +0200
    Re: [PATCH] x86/ftrace: Exclude functions in head64.c from  function-tracing "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-06-27 16:50 +0200
      Re: [PATCH] x86/ftrace: Exclude functions in head64.c from  function-tracing Steven Rostedt <rostedt@goodmis.org> - 2017-06-27 17:00 +0200
  [tip:x86/mm] x86/ftrace: Exclude functions in head64.c from  function-tracing "tip-bot for Kirill A. Shutemov" <tipbot@zytor.com> - 2017-06-29 22:40 +0200

csiph-web