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Date: Sat, 8 Jan 2011 22:10:13 +0800
From: "Guan Xuetao" <guanxuetao@...c.pku.edu.cn>
To: "'Sam Ravnborg'" <sam@...nborg.org>,
"'lkml'" <linux-kernel@...r.kernel.org>,
"'linux-kbuild'" <linux-kbuild@...r.kernel.org>,
"'linux arch'" <linux-arch@...r.kernel.org>,
"'Arnd Bergmann'" <arnd@...db.de>,
"'Michal Marek'" <mmarek@...e.cz>
Subject: RE: [PATCH 1/2] kbuild: asm-generic support
> -----Original Message-----
> From: linux-arch-owner@...r.kernel.org [mailto:linux-arch-owner@...r.kernel.org] On Behalf Of Sam Ravnborg
> Sent: Saturday, January 08, 2011 9:04 PM
> To: lkml; linux-kbuild; linux arch; Arnd Bergmann; Guan Xuetao; Michal Marek
> Subject: [PATCH 1/2] kbuild: asm-generic support
>
> >From 47a8c36e0549191ef8b0ba7dea01d7099b772760 Mon Sep 17 00:00:00 2001
> From: Sam Ravnborg <sam@...nborg.org>
> Date: Sat, 8 Jan 2011 14:00:50 +0100
> Subject: [PATCH 1/2] kbuild: asm-generic support
>
> There is an increasing amount of header files
> shared between individual architectures in asm-generic.
> To avoid a lot of dummy wrapper files that just
> include the corresponding file in asm-generic provide
> some basic support in kbuild for this.
>
> With the followign patch an architecture can maintain
> a list of files in the file arch/$(ARCH)/include/asm-generic
>
> For each file listed kbuild will generate the necessary wrapper
> in arch/$(ARCH)/include/generated/asm.
> When installing userspace headers a wrapper is likewise created.
>
> The original inspiration for this came from the unicor32
> patchset - although is used a different method.
>
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Cc: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
> Cc: Arnd Bergmann <arnd@...db.de>
> ---
> Makefile | 12 +++++--
> include/asm-generic/Kbuild.asm | 66 ++++++++++++++++++++--------------------
> scripts/Makefile.headersinst | 19 ++++++++++-
> scripts/asm-generic.sh | 23 ++++++++++++++
> 4 files changed, 82 insertions(+), 38 deletions(-)
> create mode 100644 scripts/asm-generic.sh
>
> diff --git a/Makefile b/Makefile
> index 74b2555..ee5437c 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -344,7 +344,8 @@ CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
>
> # Use LINUXINCLUDE when you must reference the include/ directory.
> # Needed to be compatible with the O= option
> -LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
> +LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
> + -Iarch/$(hrd-arch)/include/generated -Iinclude \
> $(if $(KBUILD_SRC), -I$(srctree)/include) \
> -include include/generated/autoconf.h
>
> @@ -411,6 +412,11 @@ ifneq ($(KBUILD_SRC),)
> $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
> endif
>
> +# Support for using generic headers in asm-generic
> +PHONY += asm-generic
> +asm-generic:
> + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/asm-generic.sh $(SRCARCH)
> +
> # To make sure we do not include .config for any of the *config targets
> # catch them early, and hand them over to scripts/kconfig/Makefile
> # It is allowed to specify more targets when calling make, including
> @@ -942,7 +948,7 @@ ifneq ($(KBUILD_SRC),)
> endif
>
> # prepare2 creates a makefile if using a separate output directory
> -prepare2: prepare3 outputmakefile
> +prepare2: prepare3 outputmakefile asm-generic
>
> prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
> include/config/auto.conf
> @@ -1016,7 +1022,7 @@ hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
> hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
>
> PHONY += __headers
> -__headers: include/linux/version.h scripts_basic FORCE
> +__headers: include/linux/version.h scripts_basic asm-generic FORCE
> $(Q)$(MAKE) $(build)=scripts scripts/unifdef
>
> PHONY += headers_install_all
arch/$(hrd-arch)/include/generated dir need to be cleaned by adding it into MRPROPER_DIRS.
> diff --git a/include/asm-generic/Kbuild.asm b/include/asm-generic/Kbuild.asm
> index c5d2e5d..f859a88 100644
> --- a/include/asm-generic/Kbuild.asm
> +++ b/include/asm-generic/Kbuild.asm
> @@ -1,45 +1,45 @@
> ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/kvm.h \
> $(srctree)/include/asm-$(SRCARCH)/kvm.h),)
> -header-y += kvm.h
> +generic-y += kvm.h
> endif
>
> ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/kvm_para.h \
> $(srctree)/include/asm-$(SRCARCH)/kvm_para.h),)
> -header-y += kvm_para.h
> +generic-y += kvm_para.h
> endif
>
> ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/a.out.h \
> $(srctree)/include/asm-$(SRCARCH)/a.out.h),)
> -header-y += a.out.h
> +generic-y += a.out.h
> endif
>
> -header-y += auxvec.h
> -header-y += bitsperlong.h
> -header-y += byteorder.h
> -header-y += errno.h
> -header-y += fcntl.h
> -header-y += ioctl.h
> -header-y += ioctls.h
> -header-y += ipcbuf.h
> -header-y += mman.h
> -header-y += msgbuf.h
> -header-y += param.h
> -header-y += poll.h
> -header-y += posix_types.h
> -header-y += ptrace.h
> -header-y += resource.h
> -header-y += sembuf.h
> -header-y += setup.h
> -header-y += shmbuf.h
> -header-y += sigcontext.h
> -header-y += siginfo.h
> -header-y += signal.h
> -header-y += socket.h
> -header-y += sockios.h
> -header-y += stat.h
> -header-y += statfs.h
> -header-y += swab.h
> -header-y += termbits.h
> -header-y += termios.h
> -header-y += types.h
> -header-y += unistd.h
> +generic-y += auxvec.h
> +generic-y += bitsperlong.h
> +generic-y += byteorder.h
> +generic-y += errno.h
> +generic-y += fcntl.h
> +generic-y += ioctl.h
> +generic-y += ioctls.h
> +generic-y += ipcbuf.h
> +generic-y += mman.h
> +generic-y += msgbuf.h
> +generic-y += param.h
> +generic-y += poll.h
> +generic-y += posix_types.h
> +generic-y += ptrace.h
> +generic-y += resource.h
> +generic-y += sembuf.h
> +generic-y += setup.h
> +generic-y += shmbuf.h
> +generic-y += sigcontext.h
> +generic-y += siginfo.h
> +generic-y += signal.h
> +generic-y += socket.h
> +generic-y += sockios.h
> +generic-y += stat.h
> +generic-y += statfs.h
> +generic-y += swab.h
> +generic-y += termbits.h
> +generic-y += termios.h
> +generic-y += types.h
> +generic-y += unistd.h
Kbuild.asm is included in arch/*/include/asm/Kbuild.
When replace all header-y with generic-y, the arch-spec headers will lost.
> diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
> index f89cb87..8cd8bb7 100644
> --- a/scripts/Makefile.headersinst
> +++ b/scripts/Makefile.headersinst
> @@ -28,9 +28,10 @@ install-file := $(install)/.install
> check-file := $(install)/.check
>
> # all headers files for this dir
> -all-files := $(header-y) $(objhdr-y)
> +all-files := $(header-y) $(objhdr-y) $(generic-y)
> input-files := $(addprefix $(srctree)/$(obj)/,$(header-y)) \
> $(addprefix $(objtree)/$(obj)/,$(objhdr-y))
> +generic-files := $(addprefix $(install)/,$(generic-y))
> output-files := $(addprefix $(install)/, $(all-files))
>
> # Work out what needs to be removed
> @@ -68,8 +69,22 @@ ifndef HDRCHECK
> __headersinst: $(subdirs) $(install-file)
> @:
>
> +# List of generic files may have two sources.
> +# If a file exits in $(srctree)/$(obj) use it
> +# otherwise create a dummy that arch/$(ARCH)/include/
> +$(generic-files): scripts/headers_install.pl
> + $(Q)set -e; \
> + if [ -f $@ ]; then \
> + $(PERL) $< $(dir $@) $(install) $(SRCARCH) $(notdir $@); \
> + else \
> + mkdir -p $(install); \
> + echo "#include <asm-generic/$(notdir $@)>" \
> + > $(install)/$(notdir $@); \
> + fi
> +
> targets += $(install-file)
> -$(install-file): scripts/headers_install.pl $(input-files) FORCE
> +$(install-file): scripts/headers_install.pl \
> + $(input-files) $(generic-files) FORCE
> $(if $(unwanted),$(call cmd,remove),)
> $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
> $(call if_changed,install)
> diff --git a/scripts/asm-generic.sh b/scripts/asm-generic.sh
> new file mode 100644
> index 0000000..ec53b37
> --- /dev/null
> +++ b/scripts/asm-generic.sh
> @@ -0,0 +1,23 @@
> +#!/bin/sh
> +#
> +# include/asm-generic contains a lot of files that are used
> +# verbatim by several architectures.
> +# This scripts read the file arch/$(ARCH)/include/asm-generic
> +# and for each file listed in this file create a small include
> +# file in arch/$(ARCH)/include/generated/
> +
> +# If this arch does not have an asm-generic file exit
> +if [ ! -e ${srctree}/arch/$1/include/asm-generic ]; then
> + exit 0
> +fi
> +
> +# read list of header files form asm-generic
> +files=$(grep -v ^# ${srctree}/arch/$1/include/asm-generic)
> +
> +gendir=arch/$1/include/generated/asm
> +mkdir -p ${gendir}
> +
> +# create include files for each file used form asm-generic
> +for F in ${files}; do
> + echo "#include <asm-generic/$F>" > ${gendir}/$F
> +done
> --
> 1.6.0.6
>
> --
Guan Xuetao
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