kbuild/recordmcount: Add RECORDMCOUNT_WARN to warn about mcount callers
When mcount is called in a section that ftrace will not modify it into a nop, we want to warn about this. But not warn about this always. Now if the user builds the kernel with the option RECORDMCOUNT_WARN=1 then the build will warn about mcount callers that are ignored and will just waste execution time. Acked-by: Michal Marek <mmarek@suse.cz> Cc: linux-kbuild@vger.kernel.org Link: http://lkml.kernel.org/r/20110421023738.714956282@goodmis.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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2 changed files with 5 additions and 1 deletions
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Makefile
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Makefile
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@ -1268,6 +1268,7 @@ help:
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@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
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@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
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@echo ' make W=1 [targets] Enable extra gcc checks'
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@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
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@echo ''
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@echo 'Execute "make" or "make all" to build all targets marked with [*] '
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@echo 'For further info see the ./README file'
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@ -244,13 +244,16 @@ endif
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ifdef CONFIG_FTRACE_MCOUNT_RECORD
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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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endif
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# Due to recursion, we must skip empty.o.
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# The empty.o file is created in the make process in order to determine
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# the target endianness and word size. It is made before all other C
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# files, including recordmcount.
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sub_cmd_record_mcount = \
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if [ $(@) != "scripts/mod/empty.o" ]; then \
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$(objtree)/scripts/recordmcount "$(@)"; \
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$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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fi;
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else
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sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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