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Subject: Re: [PATCH 2/3] kbuild: add real-prereqs shorthand for $(filter-out
 FORCE, $^)
To:     Masahiro Yamada <yamada.masahiro@socionext.com>,
        linux-kbuild@vger.kernel.org
Cc:     Mark Rutland <mark.rutland@arm.com>,
        Mark Greer <mgreer@animalcreek.com>,
        linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        Ingo Molnar <mingo@redhat.com>, Joel Stanley <joel@jms.id.au>,
        James Hogan <jhogan@kernel.org>, devicetree@vger.kernel.org,
        Kees Cook <keescook@chromium.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Michal Marek <michal.lkml@markovi.net>,
        "Mauro S. M. Rodrigues" <maurosr@linux.vnet.ibm.com>,
        linux-mips@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
        Paul Burton <paul.burton@mips.com>,
        linuxppc-dev@lists.ozlabs.org
References: <1547698231-20985-1-git-send-email-yamada.masahiro@socionext.com>
 <1547698231-20985-2-git-send-email-yamada.masahiro@socionext.com>
From:   Alexey Kardashevskiy <aik@ozlabs.ru>
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Message-ID: <71a0e80a-c587-4973-cfc3-9c74b2b3a16c@ozlabs.ru>
Date:   Thu, 17 Jan 2019 15:22:16 +1100
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On 17/01/2019 15:10, Masahiro Yamada wrote:
> In Kbuild, if_changed and friends must have FORCE as a prerequisite.
> 
> Hence, $(filter-out FORCE,$^) or $(filter-out $(PHONY),$^) is a common
> pattern to get the names of all the prerequisites except phony targets.
> 
> Add real-prereqs as a shorthand.
> 
> Note:
> We cannot replace $(filter %.o,$^) in cmd_link_multi-m because $^ may
> include auto-generated dependencies from the .*.cmd file when a single
> object module is changed into a multi object module. For details,
> see commit 69ea912fda74 ("kbuild: remove unneeded link_multi_deps").
> I added a comment to avoid accidental breakage.


What is this series made on top of? This does not apply on top of master
from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git


> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
> 
>  Documentation/devicetree/bindings/Makefile |  2 +-
>  arch/mips/boot/Makefile                    |  2 +-
>  arch/powerpc/boot/Makefile                 |  2 +-
>  arch/x86/realmode/rm/Makefile              |  3 +--
>  scripts/Kbuild.include                     |  4 ++++
>  scripts/Makefile.build                     |  9 ++++++---
>  scripts/Makefile.lib                       | 18 +++++++++---------
>  scripts/Makefile.modpost                   |  2 +-
>  8 files changed, 24 insertions(+), 18 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile
> index 6e5cef0..e4eb5d1 100644
> --- a/Documentation/devicetree/bindings/Makefile
> +++ b/Documentation/devicetree/bindings/Makefile
> @@ -15,7 +15,7 @@ DT_TMP_SCHEMA := processed-schema.yaml
>  extra-y += $(DT_TMP_SCHEMA)
>  
>  quiet_cmd_mk_schema = SCHEMA  $@
> -      cmd_mk_schema = $(DT_MK_SCHEMA) $(DT_MK_SCHEMA_FLAGS) -o $@ $(filter-out FORCE, $^)
> +      cmd_mk_schema = $(DT_MK_SCHEMA) $(DT_MK_SCHEMA_FLAGS) -o $@ $(real-prereqs)
>  
>  DT_DOCS = $(shell cd $(srctree)/$(src) && find * -name '*.yaml')
>  DT_SCHEMA_FILES ?= $(addprefix $(src)/,$(DT_DOCS))
> diff --git a/arch/mips/boot/Makefile b/arch/mips/boot/Makefile
> index 35704c2..3ce4dd5 100644
> --- a/arch/mips/boot/Makefile
> +++ b/arch/mips/boot/Makefile
> @@ -115,7 +115,7 @@ endif
>  targets += vmlinux.its.S
>  
>  quiet_cmd_its_cat = CAT     $@
> -      cmd_its_cat = cat $(filter-out $(PHONY), $^) >$@
> +      cmd_its_cat = cat $(real-prereqs) >$@
>  
>  $(obj)/vmlinux.its.S: $(addprefix $(srctree)/arch/mips/$(PLATFORM)/,$(ITS_INPUTS)) FORCE
>  	$(call if_changed,its_cat)
> diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
> index 0e8dadd..73d1f35 100644
> --- a/arch/powerpc/boot/Makefile
> +++ b/arch/powerpc/boot/Makefile
> @@ -218,7 +218,7 @@ quiet_cmd_bootas = BOOTAS  $@
>        cmd_bootas = $(BOOTCC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
>  
>  quiet_cmd_bootar = BOOTAR  $@
> -      cmd_bootar = $(BOOTAR) $(BOOTARFLAGS) $@.$$$$ $(filter-out FORCE,$^); mv $@.$$$$ $@
> +      cmd_bootar = $(BOOTAR) $(BOOTARFLAGS) $@.$$$$ $(real-prereqs); mv $@.$$$$ $@
>  
>  $(obj-libfdt): $(obj)/%.o: $(srctree)/scripts/dtc/libfdt/%.c FORCE
>  	$(call if_changed_dep,bootcc)
> diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile
> index 4463fa7..394377c 100644
> --- a/arch/x86/realmode/rm/Makefile
> +++ b/arch/x86/realmode/rm/Makefile
> @@ -37,8 +37,7 @@ REALMODE_OBJS = $(addprefix $(obj)/,$(realmode-y))
>  sed-pasyms := -n -r -e 's/^([0-9a-fA-F]+) [ABCDGRSTVW] (.+)$$/pa_\2 = \2;/p'
>  
>  quiet_cmd_pasyms = PASYMS  $@
> -      cmd_pasyms = $(NM) $(filter-out FORCE,$^) | \
> -		   sed $(sed-pasyms) | sort | uniq > $@
> +      cmd_pasyms = $(NM) $(real-prereqs) | sed $(sed-pasyms) | sort | uniq > $@
>  
>  targets += pasyms.h
>  $(obj)/pasyms.h: $(REALMODE_OBJS) FORCE
> diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> index 3081603..d93250b 100644
> --- a/scripts/Kbuild.include
> +++ b/scripts/Kbuild.include
> @@ -24,6 +24,10 @@ depfile = $(subst $(comma),_,$(dot-target).d)
>  basetarget = $(basename $(notdir $@))
>  
>  ###
> +# real prerequisites without phony targets
> +real-prereqs = $(filter-out $(PHONY), $^)
> +
> +###
>  # Escape single quote for use in echo statements
>  escsq = $(subst $(squote),'\$(squote)',$1)
>  
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 681ab58..9800178 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -399,8 +399,7 @@ $(sort $(subdir-obj-y)): $(subdir-ym) ;
>  ifdef builtin-target
>  
>  quiet_cmd_ar_builtin = AR      $@
> -      cmd_ar_builtin = rm -f $@; \
> -                     $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^)
> +      cmd_ar_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
>  
>  $(builtin-target): $(real-obj-y) FORCE
>  	$(call if_changed,ar_builtin)
> @@ -428,7 +427,7 @@ ifdef lib-target
>  quiet_cmd_link_l_target = AR      $@
>  
>  # lib target archives do get a symbol table and index
> -cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
> +cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
>  
>  $(lib-target): $(lib-y) FORCE
>  	$(call if_changed,link_l_target)
> @@ -453,6 +452,10 @@ targets += $(obj)/lib-ksyms.o
>  
>  endif
>  
> +# NOTE:
> +# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
> +# module is turned into a multi object module, $^ will contain header file
> +# dependencies recorded in the .*.cmd file.
>  quiet_cmd_link_multi-m = LD [M]  $@
>  cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis)
>  
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index ebaa348..c6fc295 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -231,7 +231,7 @@ $(obj)/%: $(src)/%_shipped
>  # ---------------------------------------------------------------------------
>  
>  quiet_cmd_ld = LD      $@
> -cmd_ld = $(LD) $(ld_flags) $(filter-out FORCE,$^) -o $@
> +      cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
>  
>  # Objcopy
>  # ---------------------------------------------------------------------------
> @@ -243,7 +243,7 @@ cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
>  # ---------------------------------------------------------------------------
>  
>  quiet_cmd_gzip = GZIP    $@
> -      cmd_gzip = cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@
> +      cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@
>  
>  # DTC
>  # ---------------------------------------------------------------------------
> @@ -321,7 +321,7 @@ dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
>  # append the size as a 32-bit littleendian number as gzip does.
>  size_append = printf $(shell						\
>  dec_size=0;								\
> -for F in $(filter-out FORCE,$^); do					\
> +for F in $(real-prereqs); do					\
>  	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);	\
>  	dec_size=$$(expr $$dec_size + $$fsize);				\
>  done;									\
> @@ -335,19 +335,19 @@ printf "%08x\n" $$dec_size |						\
>  )
>  
>  quiet_cmd_bzip2 = BZIP2   $@
> -      cmd_bzip2 = (cat $(filter-out FORCE,$^) | bzip2 -9 && $(size_append)) > $@
> +      cmd_bzip2 = (cat $(real-prereqs) | bzip2 -9 && $(size_append)) > $@
>  
>  # Lzma
>  # ---------------------------------------------------------------------------
>  
>  quiet_cmd_lzma = LZMA    $@
> -      cmd_lzma = (cat $(filter-out FORCE,$^) | lzma -9 && $(size_append)) > $@
> +      cmd_lzma = (cat $(real-prereqs) | lzma -9 && $(size_append)) > $@
>  
>  quiet_cmd_lzo = LZO     $@
> -      cmd_lzo = (cat $(filter-out FORCE,$^) | lzop -9 && $(size_append)) > $@
> +      cmd_lzo = (cat $(real-prereqs) | lzop -9 && $(size_append)) > $@
>  
>  quiet_cmd_lz4 = LZ4     $@
> -      cmd_lz4 = (cat $(filter-out FORCE,$^) | lz4c -l -c1 stdin stdout && \
> +      cmd_lz4 = (cat $(real-prereqs) | lz4c -l -c1 stdin stdout && \
>                    $(size_append)) > $@
>  
>  # U-Boot mkimage
> @@ -390,11 +390,11 @@ quiet_cmd_uimage = UIMAGE  $@
>  # big dictionary would increase the memory usage too much in the multi-call
>  # decompression mode. A BCJ filter isn't used either.
>  quiet_cmd_xzkern = XZKERN  $@
> -cmd_xzkern = (cat $(filter-out FORCE,$^) | \
> +      cmd_xzkern = (cat $(real-prereqs) | \
>  	sh $(srctree)/scripts/xz_wrap.sh && $(size_append)) > $@
>  
>  quiet_cmd_xzmisc = XZMISC  $@
> -cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
> +      cmd_xzmisc = (cat $(real-prereqs) | \
>  	xz --check=crc32 --lzma2=dict=1MiB) > $@
>  
>  # ASM offsets
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> index 7d4af0d0..c0b7f52 100644
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -122,7 +122,7 @@ quiet_cmd_ld_ko_o = LD [M]  $@
>        cmd_ld_ko_o =                                                     \
>  	$(LD) -r $(KBUILD_LDFLAGS)                                      \
>                   $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)             \
> -                 -o $@ $(filter-out FORCE,$^) ;                         \
> +                 -o $@ $(real-prereqs) ;                                \
>  	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
>  
>  $(modules): %.ko :%.o %.mod.o FORCE
> 

-- 
Alexey