[PATCH 4.4 22/35] trace: Use -mcount-record for dynamic ftrace
From: Greg Kroah-Hartman
Date: Mon Feb 22 2021 - 08:44:00 EST
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
commit 96f60dfa5819a065bfdd2f2ba0df7d9cbce7f4dd upstream.
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@xxxxxxxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
scripts/Makefile.build | 6 ++++++
1 file changed, 6 insertions(+)
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -221,6 +221,11 @@ 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
@@ -250,6 +255,7 @@ cmd_record_mcount = \
$(sub_cmd_record_mcount) \
fi;
endif
+endif
define rule_cc_o_c
$(call echo-cmd,checksrc) $(cmd_checksrc) \