linux-kernel - Re: [PATCH v3 2/9] kbuild: Support for Symbols.list creation

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Date:   Thu, 11 Apr 2019 11:18:59 +0200
From:   Artem Savkov <asavkov@...hat.com>
To:     Joe Lawrence <joe.lawrence@...hat.com>
Cc:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        linux-kbuild@...r.kernel.org, Jessica Yu <jeyu@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Joao Moreira <jmoreira@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michael Matz <matz@...e.de>, Miroslav Benes <mbenes@...e.cz>,
        Nicolai Stange <nstange@...e.de>,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH v3 2/9] kbuild: Support for Symbols.list creation

On Wed, Apr 10, 2019 at 11:50:51AM -0400, Joe Lawrence wrote:
> -clean: archclean vmlinuxclean
> +klpclean:
> +	$(Q) rm -f $(objtree)/Symbols.list

nit: $(SLIST) can be used here.

> +clean: archclean vmlinuxclean klpclean
>  
>  # mrproper - Delete all generated files, including .config
>  #
> diff --git a/samples/livepatch/Makefile b/samples/livepatch/Makefile
> index 2472ce39a18d..8b9b42a258ad 100644
> --- a/samples/livepatch/Makefile
> +++ b/samples/livepatch/Makefile
> @@ -1,3 +1,4 @@
> +LIVEPATCH_livepatch-sample := y
>  obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-sample.o
>  obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-shadow-mod.o
>  obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-shadow-fix1.o
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 76ca30cc4791..ca76bd2080f0 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -246,6 +246,11 @@ cmd_gen_ksymdeps = \
>  	$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
>  endif
>  
> +ifdef CONFIG_LIVEPATCH
> +cmd_livepatch = $(if $(LIVEPATCH_$(basetarget)),		\
> +	$(shell touch $(MODVERDIR)/$(basetarget).livepatch))
> +endif
> +
>  define rule_cc_o_c
>  	$(call cmd,checksrc)
>  	$(call cmd_and_fixdep,cc_o_c)
> @@ -280,6 +285,7 @@ $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
>  $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
>  	$(call cmd,force_checksrc)
>  	$(call if_changed_rule,cc_o_c)
> +	$(call cmd_livepatch)

nit: maybe use "cmd,livepatch" to be consistent with the other call of
this function.

>  	@{ echo $(@:.o=.ko); echo $@; \
>  	   $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
>  
> @@ -456,6 +462,7 @@ cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis
>  
>  $(multi-used-m): FORCE
>  	$(call if_changed,link_multi-m)
> +	$(call cmd,livepatch)
>  	@{ echo $(@:.o=.ko); echo $(filter %.o,$^); \
>  	   $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
>  $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
> -- 
> 2.20.1
> 

-- 
 Artem