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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>
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parent
f28bc3c32c
commit
07d0408120
7
Makefile
7
Makefile
@ -743,6 +743,13 @@ ifdef CONFIG_FUNCTION_TRACER
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ifndef CC_FLAGS_FTRACE
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CC_FLAGS_FTRACE := -pg
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endif
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ifdef CONFIG_FTRACE_MCOUNT_RECORD
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# gcc 5 supports generating the mcount tables directly
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ifeq ($(call cc-option-yn,-mrecord-mcount),y)
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CC_FLAGS_FTRACE += -mrecord-mcount
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export CC_USING_RECORD_MCOUNT := 1
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endif
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endif
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ifdef CONFIG_HAVE_FENTRY
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ifeq ($(call cc-option-yn, -mfentry),y)
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CC_FLAGS_FTRACE += -mfentry
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@ -206,11 +206,8 @@ cmd_modversions_c = \
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endif
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ifdef CONFIG_FTRACE_MCOUNT_RECORD
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# gcc 5 supports generating the mcount tables directly
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ifneq ($(call cc-option,-mrecord-mcount,y),y)
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KBUILD_CFLAGS += -mrecord-mcount
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else
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# else do it all manually
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ifndef CC_USING_RECORD_MCOUNT
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# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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ifdef BUILD_C_RECORDMCOUNT
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ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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RECORDMCOUNT_FLAGS = -w
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@ -239,7 +236,7 @@ cmd_record_mcount = \
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"$(CC_FLAGS_FTRACE)" ]; then \
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$(sub_cmd_record_mcount) \
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fi;
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endif # -record-mcount
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endif # CC_USING_RECORD_MCOUNT
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endif # CONFIG_FTRACE_MCOUNT_RECORD
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ifdef CONFIG_STACK_VALIDATION
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