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Date: Wed, 13 Apr 2016 11:35:26 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: Emese Revfy <re.emese@...il.com>
Cc: Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
pageexec@...email.hu, spender@...ecurity.net,
kernel-hardening@...ts.openwall.com, Michal Marek <mmarek@...e.com>,
Kees Cook <keescook@...omium.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>, fengguang.wu@...el.com,
Dmitry Vyukov <dvyukov@...gle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
David Brown <david.brown@...aro.org>
Subject: Re: [PATCH v6 2/6] GCC plugin infrastructure
Hi Emese,
2016-04-08 6:13 GMT+09:00 Emese Revfy <re.emese@...il.com>:
> diff --git a/Makefile b/Makefile
> index 173437d..3af7b9e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -418,6 +418,8 @@ export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
> export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
> export KBUILD_ARFLAGS
>
> +export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGINS_AFLAGS
> +
> # When compiling out-of-tree modules, put MODVERDIR in the module
> # tree rather than in the kernel tree. The kernel tree might
> # even be read-only.
> @@ -548,7 +550,7 @@ ifeq ($(KBUILD_EXTMOD),)
> # in parallel
> PHONY += scripts
> scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
> - asm-generic
> + asm-generic gcc-plugins
> $(Q)$(MAKE) $(build)=$(@)
>
> # Objects we will link into vmlinux / subdirs we need to visit
> @@ -623,6 +625,15 @@ endif
> # Tell gcc to never replace conditional load with a non-conditional one
> KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
>
> +PHONY += gcc-plugins
> +gcc-plugins: scripts_basic
> +ifdef CONFIG_GCC_PLUGINS
> + $(Q)$(MAKE) $(build)=scripts/gcc-plugins
> +endif
> + @:
> +
> +include scripts/Makefile.gcc-plugins
> +
> ifdef CONFIG_READABLE_ASM
> # Disable optimizations that make assembler listings hard to read.
> # reorder blocks reorders the control in the function
> @@ -949,6 +960,8 @@ endif
>
> # The actual objects are generated when descending,
> # make sure no implicit rule kicks in
> +$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
I do not get your intention here.
It looks like you are trying to omit plugin flags for init/ directory.
(Actually this code is not working, though)
Then, you add plug the following lines to init/Makefile
+ccflags-y := $(GCC_PLUGINS_CFLAGS)
+asflags-y := $(GCC_PLUGINS_AFLAGS)
> # Handle descending into subdirectories listed in $(vmlinux-dirs)
> @@ -1001,10 +1014,13 @@ prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
>
> archprepare: archheaders archscripts prepare1 scripts_basic
>
> -prepare0: archprepare FORCE
> +prepare0: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +prepare0: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +prepare0: archprepare gcc-plugins FORCE
> $(Q)$(MAKE) $(build)=.
>
> # All the preparing..
> +prepare: KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
> prepare: prepare0 prepare-objtool
>
> ifdef CONFIG_STACK_VALIDATION
> @@ -1137,6 +1153,8 @@ all: modules
> # using awk while concatenating to the final file.
>
> PHONY += modules
> +modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
> $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
> @$(kecho) ' Building modules, stage 2.';
> @@ -1257,7 +1275,7 @@ distclean: mrproper
> @find $(srctree) $(RCS_FIND_IGNORE) \
> \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
> -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
> - -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
> + -o -name '.*.rej' -o -name '*.so' -o -name '*%' -o -name 'core' \) \
> -type f -print | xargs rm -f
>
>
> @@ -1426,6 +1444,8 @@ PHONY += $(module-dirs) modules
> $(module-dirs): crmodverdir $(objtree)/Module.symvers
> $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
>
> +modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> modules: $(module-dirs)
> @$(kecho) ' Building modules, stage 2.';
> $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
> @@ -1567,10 +1587,14 @@ else
> target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
> endif
>
> +%.s: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.s: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> %.s: %.c prepare scripts FORCE
> $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> %.i: %.c prepare scripts FORCE
> $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> +%.o: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.o: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> %.o: %.c prepare scripts FORCE
> $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> %.lst: %.c prepare scripts FORCE
> @@ -1589,10 +1613,14 @@ endif
> $(build)=$(build-dir)
> # Make sure the latest headers are built for Documentation
> Documentation/: headers_install
> +%/: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%/: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> %/: prepare scripts FORCE
> $(cmd_crmodverdir)
> $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
> $(build)=$(build-dir)
> +%.ko: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.ko: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> %.ko: prepare scripts FORCE
> $(cmd_crmodverdir)
> $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Why do you need to sprinkle "KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)"
here and there?
Unless I am missing something, I think the following should work.
diff --git a/Makefile b/Makefile
index 5d65f4b..f85420b 100644
--- a/Makefile
+++ b/Makefile
@@ -962,8 +962,6 @@ endif
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
-$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
# Handle descending into subdirectories listed in $(vmlinux-dirs)
@@ -1016,13 +1014,10 @@ prepare1: prepare2 $(version_h)
include/generated/utsrelease.h
archprepare: archheaders archscripts prepare1 scripts_basic
-prepare0: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-prepare0: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
prepare0: archprepare gcc-plugins FORCE
$(Q)$(MAKE) $(build)=.
# All the preparing..
-prepare: KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
prepare: prepare0 prepare-objtool
ifdef CONFIG_STACK_VALIDATION
@@ -1155,8 +1150,6 @@ all: modules
# using awk while concatenating to the final file.
PHONY += modules
-modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
$(Q)$(AWK) '!x[$$0]++'
$(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtre
@$(kecho) ' Building modules, stage 2.';
@@ -1446,8 +1439,6 @@ PHONY += $(module-dirs) modules
$(module-dirs): crmodverdir $(objtree)/Module.symvers
$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
-modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
modules: $(module-dirs)
@$(kecho) ' Building modules, stage 2.';
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
@@ -1589,14 +1580,10 @@ else
target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif
-%.s: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-%.s: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
%.s: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.i: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
-%.o: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-%.o: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
%.o: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.lst: %.c prepare scripts FORCE
@@ -1615,14 +1602,10 @@ endif
$(build)=$(build-dir)
# Make sure the latest headers are built for Documentation
Documentation/: headers_install
-%/: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-%/: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
%/: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
-%.ko: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
-%.ko: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
%.ko: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index 25a70fb..34d6224 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -26,4 +26,6 @@ ifdef CONFIG_GCC_PLUGINS
endif
endif
+ KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
+
endif
--
Best Regards
Masahiro Yamada
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