linux-kernel - Re: [RFC][PATCH 2/2] ftrace/kbuild: Add recordmcount files to force full build

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Date:	Tue, 17 May 2011 15:36:46 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 2/2] ftrace/kbuild: Add recordmcount files to force
 full build

On Mon, May 16, 2011 at 10:10:29PM -0400, Steven Rostedt wrote:
> From: Steven Rostedt <srostedt@...hat.com>
> 
> Modifications to recordmcount must be performed on all object
> files to stay consistent with what the kernel code may expect.
> Add the recordmcount files to the force-deps to make sure
> any change to them causes a full recompile.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  scripts/Makefile.build |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 0ff5a58..057d6e9 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -252,6 +252,7 @@ sub_cmd_record_mcount =					\
>  	if [ $(@) != "scripts/mod/empty.o" ]; then	\
>  		$(objtree)/scripts/recordmcount "$(@)";	\
>  	fi;
> +force-deps += $(srctree)/scripts/recordmcount.c $(srctree)/scripts/recordmcount.h
>  else
>  sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
>  	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
> @@ -259,6 +260,7 @@ sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH
>  	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
>  	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
>  	"$(if $(part-of-module),1,0)" "$(@)";
> +force-deps += $(srctree)/scripts/recordmcount.pl
>  endif
>  cmd_record_mcount = 						\
>  	if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then	\

We could add recordmcount.c as a dependency in scripts/Makefile.build
directly, without playing with fixdep, like this (untested):

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index f133641..bc2c8d3 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -268,6 +268,7 @@ sub_cmd_record_mcount =					\
 	if [ $(@) != "scripts/mod/empty.o" ]; then	\
 		$(objtree)/scripts/recordmcount "$(@)";	\
 	fi;
+recordmcount_source := $(srctree)/scripts/recordmcount.c
 else
 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
 	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
@@ -275,6 +276,7 @@ sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH
 	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
 	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
 	"$(if $(part-of-module),1,0)" "$(@)";
+recordmcount_source := $(srctree)/scripts/recordmcount.pl
 endif
 cmd_record_mcount = 						\
 	if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then	\
@@ -295,13 +297,13 @@ define rule_cc_o_c
 endef
 
 # Built-in and composite module parts
-$(obj)/%.o: $(src)/%.c FORCE
+$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
 	$(call cmd,force_checksrc)
 	$(call if_changed_rule,cc_o_c)
 
 # Single-part modules are special since we need to mark them in $(MODVERDIR)
 
-$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
+$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
 	$(call cmd,force_checksrc)
 	$(call if_changed_rule,cc_o_c)
 	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)

Michal
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