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

Kirill A. Shutemov
2017-06-27T12:00:06Z

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