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Subject[PATCH 1/4] trace: handle CC_FLAGS_FTRACE more accurately
CC_FLAGS_FTRACE is exported and later used to remove ftrace relevant
build flags from files which should be built without ftrace support.
For that reason add -mfentry to CC_FLAGS_FTRACE as well. That fixes
a problem with vdso32 build on s390, where -mfentry could not be used
together with -m31 flag.

At the same time flags like -pg and -mfentry are not relevant for asm
files, so avoid adding them to KBUILD_AFLAGS.

Introduce CC_FLAGS_USING instead of CC_USING_FENTRY to collect
-DCC_USING_FENTRY (and future alike) which are relevant for both
KBUILD_CFLAGS and KBUILD_AFLAGS.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---
Makefile | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 7a3c4548162b..503f533277c7 100644
--- a/Makefile
+++ b/Makefile
@@ -743,12 +743,15 @@ ifdef CONFIG_FUNCTION_TRACER
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
-export CC_FLAGS_FTRACE
ifdef CONFIG_HAVE_FENTRY
-CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
+ ifeq ($(call cc-option-yn, -mfentry),y)
+ CC_FLAGS_FTRACE += -mfentry
+ CC_FLAGS_USING += -DCC_USING_FENTRY
+ endif
endif
-KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
-KBUILD_AFLAGS += $(CC_USING_FENTRY)
+export CC_FLAGS_FTRACE
+KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
+KBUILD_AFLAGS += $(CC_FLAGS_USING)
ifdef CONFIG_DYNAMIC_FTRACE
ifdef CONFIG_HAVE_C_RECORDMCOUNT
BUILD_C_RECORDMCOUNT := y
--
2.18.0.13.gd42ae10
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