From bb43dbc5e09d52c6085dfee65f4f923b3fbcd1d4 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Tue, 27 Jun 2017 14:59:48 +0300 Subject: [PATCH] x86/ftrace: Exclude functions in head64.c from function-tracing A recent commit 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. Tracing this function is not possible because it's invoked from the earliest boot stage before the relocation fixups have been done. It is the function doing the relocation. Exclude it from being built with tracer stubs. Fixes: c88d71508e36 ("x86/boot/64: Rewrite startup_64() in C") Reported-by: Fengguang Wu Signed-off-by: Kirill A. Shutemov Acked-by: Steven Rostedt Signed-off-by: Thomas Gleixner Cc: lkp@01.org Link: http://lkml.kernel.org/r/20170627115948.17938-1-kirill.shutemov@linux.intel.com --- 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 -- 2.20.1