trace: Use -mcount-record for dynamic ftrace
authorAndi Kleen <ak@linux.intel.com>
Mon, 27 Nov 2017 21:34:13 +0000 (13:34 -0800)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Mon, 28 May 2018 16:49:51 +0000 (12:49 -0400)
gcc 5 supports a new -mcount-record option to generate ftrace
tables directly. This avoids the need to run record_mcount
manually.

Use this option when available.

So far doesn't use -mcount-nop, which also exists now.

This is needed to make ftrace work with LTO because the
normal record-mcount script doesn't run over the link
time output.

It should also improve build times slightly in the general
case.
Link: http://lkml.kernel.org/r/20171127213423.27218-12-andi@firstfloor.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
scripts/Makefile.build

index 8bdb1dc..dcbca18 100644 (file)
@@ -207,6 +207,11 @@ cmd_modversions_c =                                                                \
 endif
 
 ifdef CONFIG_FTRACE_MCOUNT_RECORD
+# gcc 5 supports generating the mcount tables directly
+ifneq ($(call cc-option,-mrecord-mcount,y),y)
+KBUILD_CFLAGS += -mrecord-mcount
+else
+# else do it all manually
 ifdef BUILD_C_RECORDMCOUNT
 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
   RECORDMCOUNT_FLAGS = -w
@@ -259,6 +264,7 @@ ifneq ($(RETPOLINE_CFLAGS),)
   objtool_args += --retpoline
 endif
 endif
+endif
 
 
 ifdef CONFIG_MODVERSIONS