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Date: Mon, 25 Apr 2011 09:29:39 +0800 From: "Guan Xuetao" <gxt@...c.pku.edu.cn> To: "'Sam Ravnborg'" <sam@...nborg.org>, "'Michal Marek'" <mmarek@...e.cz> Cc: "'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>, "'Guan Xuetao'" <guanxuetao@...c.pku.edu.cn> Subject: RE: [PATCH v3] kbuild: asm-generic support > -----Original Message----- > From: Sam Ravnborg [mailto:sam@...nborg.org] > Sent: Friday, April 22, 2011 11:54 PM > To: Michal Marek > Cc: lkml; linux-kbuild; linux arch; Arnd Bergmann; Guan Xuetao > Subject: [PATCH v3] kbuild: asm-generic support > > >From 34d0b72a343dd63c1c1b049e4ba6931f0dbcbc3f Mon Sep 17 00:00:00 2001 > From: Sam Ravnborg <sam@...nborg.org> > Date: Fri, 22 Apr 2011 14:45:13 +0200 > Subject: [PATCH] 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 following patch an architecture can maintain > a list of files in the file arch/$(ARCH)/include/asm/Kbuild > > To use a generic file just add: > > generic-y += <name-of-header-file.h> > > For each file listed kbuild will generate the necessary > wrapper in arch/$(ARCH)/include/generated/asm. > > When installing userspace headers a wrapper is likewise created. > > The original inspiration for this came from the unicore32 > patchset - although a different method is used. > > The patch includes several improvements from Arnd Bergmann. > Michael Marek contributed Makefile.asm-generic. > > Signed-off-by: Sam Ravnborg <sam@...nborg.org> > Cc: Guan Xuetao <guanxuetao@...c.pku.edu.cn> > Cc: Arnd Bergmann <arnd@...db.de> > --- > > Hi Mikael. > > It took me a while to get back to this. > I used your Makefile.asm-generic almost verbatim. > > Only change was that we always need to create the output directory. > > Sam > > .gitignore | 1 + > Documentation/kbuild/makefiles.txt | 36 ++++++++++++++++++++++++++++++++++++ > Makefile | 15 +++++++++++---- > scripts/Makefile.asm-generic | 23 +++++++++++++++++++++++ > scripts/Makefile.headersinst | 18 +++++++++++++++--- > 5 files changed, 86 insertions(+), 7 deletions(-) > create mode 100644 scripts/Makefile.asm-generic > > diff --git a/.gitignore b/.gitignore > index 5d56a3f..9dacde0 100644 > --- a/.gitignore > +++ b/.gitignore > @@ -57,6 +57,7 @@ modules.builtin > include/config > include/linux/version.h > include/generated > +arch/*/include/generated > > # stgit generated dirs > patches-* > diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt > index 5d145bb..7f2b8e7 100644 > --- a/Documentation/kbuild/makefiles.txt > +++ b/Documentation/kbuild/makefiles.txt > @@ -40,11 +40,13 @@ This document describes the Linux kernel Makefiles. > --- 6.6 Commands useful for building a boot image > --- 6.7 Custom kbuild commands > --- 6.8 Preprocessing linker scripts > + --- 6.9 Generic header files > > === 7 Kbuild syntax for exported headers > --- 7.1 header-y > --- 7.2 objhdr-y > --- 7.3 destination-y > + --- 7.4 generic-y > > === 8 Kbuild Variables > === 9 Makefile language > @@ -1209,6 +1211,14 @@ When kbuild executes, the following steps are followed (roughly): > The kbuild infrastructure for *lds file are used in several > architecture-specific files. > > +--- 6.9 Generic header files > + > + The directory include/asm-generic contains the header files > + that may be shared between individual architectures. > + The recommended approach how to use a generic header file is > + to list the file in the Kbuild file. > + See "7.4 generic-y" for further info on syntax etc. > + > === 7 Kbuild syntax for exported headers > > The kernel include a set of headers that is exported to userspace. > @@ -1265,6 +1275,32 @@ See subsequent chapter for the syntax of the Kbuild file. > In the example above all exported headers in the Kbuild file > will be located in the directory "include/linux" when exported. > > + --- 7.4 generic-y > + > + If an architecture uses a verbatim copy of a header from > + include/asm-generic then this is listed in the file > + arch/$(ARCH)/include/asm/Kbuild like this: > + > + Example: > + #arch/x86/include/asm/Kbuild > + generic-y += termios.h > + generic-y += rtc.h > + > + During the prepare phase of the build a wrapper include > + file is generated in the directory: > + > + arch/$(ARCH)/include/generated/asm > + > + When a header is exported where the architecture uses > + the generic header a similar wrapper is generated as part > + of the set of exported headers in the directory: > + > + usr/include/asm > + > + The generated wrapper will in both cases look like the following: > + > + Example: termios.h > + #include <asm-generic/termios.h> > > === 8 Kbuild Variables > > diff --git a/Makefile b/Makefile > index b967b96..30b3852 100644 > --- a/Makefile > +++ b/Makefile > @@ -349,7 +349,8 @@ 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/$(hdr-arch)/include/generated -Iinclude \ I think $(srctree) is necessary before new include-dir. > $(if $(KBUILD_SRC), -I$(srctree)/include) \ > -include include/generated/autoconf.h > > @@ -416,6 +417,11 @@ ifneq ($(KBUILD_SRC),) > $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) > endif > > +# Support for using generic headers in asm-generic > +PHONY += asm-generic > +asm-generic: > + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic obj=arch/$(SRCARCH)/include/generated/asm Too long > + > # 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 > @@ -947,7 +953,7 @@ 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 > @@ -1021,7 +1027,7 @@ 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) $(build)=scripts build_unifdef > > PHONY += headers_install_all > @@ -1136,7 +1142,8 @@ CLEAN_FILES += vmlinux System.map \ > .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map > > # Directories & files removed with 'make mrproper' > -MRPROPER_DIRS += include/config usr/include include/generated > +MRPROPER_DIRS += include/config usr/include include/generated \ > + arch/*/include/generated > MRPROPER_FILES += .config .config.old .version .old_version \ > include/linux/version.h \ > Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS > diff --git a/scripts/Makefile.asm-generic b/scripts/Makefile.asm-generic > new file mode 100644 > index 0000000..a687cb6 > --- /dev/null > +++ b/scripts/Makefile.asm-generic > @@ -0,0 +1,23 @@ > +# include/asm-generic contains a lot of files that are used > +# verbatim by several architectures. > +# > +# This Makefile reads the file arch/$(SRCARCH)/include/asm/Kbuild > +# and for each file listed in this file with generic-y creates > +# a small wrapper file in $(obj) (arch/$(SRCARCH)/include/generated/asm) > + > +kbuild-file := $(srctree)/arch/$(SRCARCH)/include/asm/Kbuild > +include $(kbuild-file) > + > +include scripts/Kbuild.include > + > +# Create output directory if not already present > +_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) > + > +quiet_cmd_wrap = WRAP $@ > +cmd_wrap = echo "\#include <asm-generic/$*.h>" >$@ > + > +all: $(patsubst %, $(obj)/%, $(generic-y)) > + > +$(obj)/%.h: > + $(call cmd,wrap) > + > diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst > index f89cb87..7960b19 100644 > --- a/scripts/Makefile.headersinst > +++ b/scripts/Makefile.headersinst > @@ -14,6 +14,7 @@ kbuild-file := $(srctree)/$(obj)/Kbuild > include $(kbuild-file) > > _dst := $(if $(destination-y),$(destination-y),$(_dst)) > +_src := $(srctree)/$(obj) _src is only used one time > > include scripts/Kbuild.include > > @@ -27,10 +28,16 @@ header-y := $(filter-out %/, $(header-y)) > install-file := $(install)/.install > check-file := $(install)/.check > > +# generic-y list all files an architecture uses from asm-generic > +# Use this to build a list of headers which require a wrapper > +wrapper-files := $(filter $(header-y), $(generic-y)) > + > # all headers files for this dir > -all-files := $(header-y) $(objhdr-y) > -input-files := $(addprefix $(srctree)/$(obj)/,$(header-y)) \ > +header-y := $(filter-out $(generic-y), $(header-y)) > +all-files := $(header-y) $(objhdr-y) $(wrapper-files) > +input-files := $(addprefix $(_src)/,$(header-y)) \ > $(addprefix $(objtree)/$(obj)/,$(objhdr-y)) > + Additional empty line > output-files := $(addprefix $(install)/, $(all-files)) > > # Work out what needs to be removed > @@ -47,8 +54,12 @@ quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\ > cmd_install = \ > $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \ > $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \ > + for F in $(wrapper-files); do \ > + echo "\#include <asm-generic/$$F>" > $(install)/$$F; \ > + done; \ > touch $@ > > + Additional empty line > quiet_cmd_remove = REMOVE $(unwanted) > cmd_remove = rm -f $(unwanted-file) > > @@ -69,7 +80,8 @@ __headersinst: $(subdirs) $(install-file) > @: > > targets += $(install-file) > -$(install-file): scripts/headers_install.pl $(input-files) FORCE > +$(install-file): scripts/headers_install.pl \ > + $(input-files) FORCE The same content > $(if $(unwanted),$(call cmd,remove),) > $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@))) > $(call if_changed,install) > -- > 1.6.0.6 I have tested on UniCore32, and it works well. Thanks Sam. Guan Xuetao -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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