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authorVasily Gorbik <gor@linux.ibm.com>2018-08-06 16:17:44 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-08-16 05:37:22 +0300
commit07d0408120216b60625c9a5b8012d1c3a907984d (patch)
tree429c3adb6437a1d828e3debdd3ab163e6ae16c90 /scripts/Makefile.build
parentf28bc3c32c059ab4d13f52155fabd3e20f477f65 (diff)
downloadlinux-07d0408120216b60625c9a5b8012d1c3a907984d.tar.xz
tracing: Avoid calling cc-option -mrecord-mcount for every Makefile
Currently if CONFIG_FTRACE_MCOUNT_RECORD is enabled -mrecord-mcount compiler flag support is tested for every Makefile. Top 4 cc-option usages: 511 -mrecord-mcount 11 -fno-stack-protector 9 -Wno-override-init 2 -fsched-pressure To address that move cc-option from scripts/Makefile.build to top Makefile and export CC_USING_RECORD_MCOUNT to be used in original place. While doing that also add -mrecord-mcount to CC_FLAGS_FTRACE (if gcc actually supports it). Link: http://lkml.kernel.org/r/patch-2.thread-aa7b8d.git-de935bace15a.your-ad-here.call-01533557518-ext-9465@work.hours Acked-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'scripts/Makefile.build')
-rw-r--r--scripts/Makefile.build9
1 files changed, 3 insertions, 6 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 514ed63ff571..42ecb8cf7666 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -206,11 +206,8 @@ cmd_modversions_c = \
endif
ifdef CONFIG_FTRACE_MCOUNT_RECORD
-# gcc 5 supports generating the mcount tables directly
-ifneq ($(call cc-option,-mrecord-mcount,y),y)
-KBUILD_CFLAGS += -mrecord-mcount
-else
-# else do it all manually
+ifndef CC_USING_RECORD_MCOUNT
+# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
RECORDMCOUNT_FLAGS = -w
@@ -239,7 +236,7 @@ cmd_record_mcount = \
"$(CC_FLAGS_FTRACE)" ]; then \
$(sub_cmd_record_mcount) \
fi;
-endif # -record-mcount
+endif # CC_USING_RECORD_MCOUNT
endif # CONFIG_FTRACE_MCOUNT_RECORD
ifdef CONFIG_STACK_VALIDATION