From: Kirill A. Shutemov Date: Tue, 27 Jun 2017 11:59:48 +0000 (+0300) Subject: x86/ftrace: Exclude functions in head64.c from function-tracing X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bb43dbc5e09d52c6085dfee65f4f923b3fbcd1d4;p=linux.git 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 --- diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 4b994232cb573..0db512092f370 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