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https://github.com/adulau/aha.git
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kbuild: optimize headers_* targets
Move the core functionality of headers_install and headers_check to two small perl scripts. The makefile is adapted to use the perl scrip and changed to operate on all files in a directory. So if one file is changed then all files in the directory is processed. perl were chosen for the helper scripts because this is pure text processing which perl is good at and especially the headers_check.pl script are expected to see changes / new checks implmented. The speed is ~300% faster on this box. And the output generated to the screen is now down to two lines per directory (one for install, one for check) so it is easier to scroll back after a kernel build. The perl scripts has been brought to sanity by patient feedback from: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Sam Ravnborg
parent
88181ec30f
commit
7712401ae9
4 changed files with 162 additions and 93 deletions
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@ -1,26 +1,14 @@
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# ==========================================================================
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# Installing headers
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#
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# header-y files will be installed verbatim
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# unifdef-y are the files where unifdef will be run before installing files
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# objhdr-y are generated files that will be installed verbatim
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# header-y - list files to be installed. They are preprocessed
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# to remove __KERNEL__ section of the file
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# unifdef-y - Same as header-y. Obsolete
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# objhdr-y - Same as header-y but for generated files
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#
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# ==========================================================================
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UNIFDEF := scripts/unifdef -U__KERNEL__
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# Eliminate the contents of (and inclusions of) compiler.h
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HDRSED := sed -e "s/ inline / __inline__ /g" \
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-e "s/[[:space:]]__user[[:space:]]\{1,\}/ /g" \
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-e "s/(__user[[:space:]]\{1,\}/ (/g" \
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-e "s/[[:space:]]__force[[:space:]]\{1,\}/ /g" \
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-e "s/(__force[[:space:]]\{1,\}/ (/g" \
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-e "s/[[:space:]]__iomem[[:space:]]\{1,\}/ /g" \
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-e "s/(__iomem[[:space:]]\{1,\}/ (/g" \
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-e "s/[[:space:]]__attribute_const__[[:space:]]\{1,\}/\ /g" \
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-e "s/[[:space:]]__attribute_const__$$//" \
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-e "/^\#include <linux\/compiler.h>/d"
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# called may set destination dir (when installing to asm/)
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_dst := $(if $(dst),$(dst),$(obj))
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kbuild-file := $(srctree)/$(obj)/Kbuild
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@ -28,89 +16,82 @@ include $(kbuild-file)
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include scripts/Kbuild.include
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install := $(INSTALL_HDR_PATH)/$(_dst)
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install := $(INSTALL_HDR_PATH)/$(_dst)
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header-y := $(sort $(header-y) $(unifdef-y))
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subdir-y := $(patsubst %/,%,$(filter %/, $(header-y)))
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header-y := $(filter-out %/, $(header-y))
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header-y := $(sort $(header-y) $(unifdef-y))
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subdirs := $(patsubst %/,%,$(filter %/, $(header-y)))
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header-y := $(filter-out %/, $(header-y))
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# stamp files for header checks
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check-y := $(patsubst %,.check.%,$(header-y) $(objhdr-y))
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# files used to track state of install/check
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install-file := $(install)/.install
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check-file := $(install)/.check
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# all headers files for this dir
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all-files := $(header-y) $(objhdr-y)
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input-files := $(addprefix $(srctree)/$(obj)/,$(header-y)) \
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$(addprefix $(objtree)/$(obj)/,$(objhdr-y))
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output-files := $(addprefix $(install)/, $(all-files))
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# Work out what needs to be removed
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oldheaders := $(patsubst $(install)/%,%,$(wildcard $(install)/*.h))
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unwanted := $(filter-out $(header-y) $(objhdr-y),$(oldheaders))
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oldheaders := $(patsubst $(install)/%,%,$(wildcard $(install)/*.h))
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unwanted := $(filter-out $(all-files),$(oldheaders))
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oldcheckstamps := $(patsubst $(install)/%,%,$(wildcard $(install)/.check.*.h))
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unwanted += $(filter-out $(check-y),$(oldcheckstamps))
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# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
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unwanted-file := $(addprefix $(install)/, $(unwanted))
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# Prefix them all with full paths to $(INSTALL_HDR_PATH)
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header-y := $(patsubst %,$(install)/%,$(header-y))
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objhdr-y := $(patsubst %,$(install)/%,$(objhdr-y))
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check-y := $(patsubst %,$(install)/%,$(check-y))
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printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
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quiet_cmd_o_hdr_install = INSTALL $(patsubst $(INSTALL_HDR_PATH)/%,%,$@)
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cmd_o_hdr_install = cp $(patsubst $(install)/%,$(objtree)/$(obj)/%,$@) \
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$(install)
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quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
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file$(if $(word 2, $(all-files)),s))
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cmd_install = $(PERL) $< $(srctree)/$(obj) $(install) $(header-y); \
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$(PERL) $< $(objtree)/$(obj) $(install) $(objhdr-y); \
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touch $@
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quiet_cmd_unifdef = UNIFDEF $(patsubst $(INSTALL_HDR_PATH)/%,%,$@)
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cmd_unifdef = $(UNIFDEF) $(patsubst $(install)/%,$(srctree)/$(obj)/%,$@)\
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| $(HDRSED) > $@ || :
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quiet_cmd_remove = REMOVE $(unwanted)
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cmd_remove = rm -f $(unwanted-file)
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quiet_cmd_check = CHECK $(patsubst $(install)/.check.%,$(_dst)/%,$@)
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cmd_check = $(CONFIG_SHELL) $(srctree)/scripts/hdrcheck.sh \
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$(INSTALL_HDR_PATH)/include $(subst /.check.,/,$@) $@
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quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files)
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cmd_check = $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH) \
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$(addprefix $(install)/, $(all-files)); \
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touch $@
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quiet_cmd_remove = REMOVE $(_dst)/$@
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cmd_remove = rm -f $(install)/$@
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PHONY += __headersinst __headerscheck
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quiet_cmd_mkdir = MKDIR $(patsubst $(INSTALL_HDR_PATH)/%,%,$@)
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cmd_mkdir = mkdir -p $@
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ifndef HDRCHECK
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# Rules for installing headers
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__headersinst: $(subdirs) $(install-file)
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@:
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.PHONY: __headersinst __headerscheck
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ifdef HDRCHECK
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__headerscheck: $(subdir-y) $(check-y)
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@true
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$(check-y) : $(install)/.check.%.h : $(install)/%.h
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$(call cmd,check)
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# Other dependencies for $(check-y)
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include /dev/null $(wildcard $(check-y))
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# but leave $(check-y) as .PHONY for now until those
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# deps are actually correct.
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.PHONY: $(check-y)
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targets += $(install-file)
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$(install-file): scripts/headers_install.pl $(input-files) FORCE
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$(if $(unwanted),$(call cmd,remove),)
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$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
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$(call if_changed,install)
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else
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# Rules for installing headers
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__headersinst: $(subdir-y) $(header-y) $(objhdr-y)
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@true
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__headerscheck: $(subdirs) $(check-file)
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@:
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$(objhdr-y) $(subdir-y) $(header-y): | $(install) $(unwanted)
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$(install):
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$(call cmd,mkdir)
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# Rules for removing unwanted header files
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.PHONY: $(unwanted)
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$(unwanted):
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$(call cmd,remove)
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# Install generated files
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$(objhdr-y): $(install)/%.h: $(objtree)/$(obj)/%.h $(kbuild-file)
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$(call cmd,o_hdr_install)
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# Unifdef header files and install them
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$(header-y): $(install)/%.h: $(srctree)/$(obj)/%.h $(kbuild-file)
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$(call cmd,unifdef)
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targets += $(check-file)
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$(check-file): scripts/headers_check.pl $(output-files) FORCE
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$(call if_changed,check)
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endif
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hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
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# Recursion
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.PHONY: $(subdir-y)
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$(subdir-y):
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hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
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.PHONY: $(subdirs)
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$(subdirs):
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$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@
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targets := $(wildcard $(sort $(targets)))
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cmd_files := $(wildcard \
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$(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
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ifneq ($(cmd_files),)
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include $(cmd_files)
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endif
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.PHONY: $(PHONY)
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PHONY += FORCE
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FORCE: ;
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@ -1,10 +0,0 @@
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#!/bin/sh
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for FILE in `grep '^[ \t]*#[ \t]*include[ \t]*<' $2 | cut -f2 -d\< | cut -f1 -d\> | egrep ^linux\|^asm` ; do
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if [ ! -r $1/$FILE ]; then
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echo $2 requires $FILE, which does not exist in exported headers
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exit 1
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fi
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done
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# FIXME: List dependencies into $3
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touch $3
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56
scripts/headers_check.pl
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56
scripts/headers_check.pl
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@ -0,0 +1,56 @@
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#!/usr/bin/perl
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#
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# headers_check.pl execute a number of trivial consistency checks
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#
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# Usage: headers_check.pl dir [files...]
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# dir: dir to look for included files
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# arch: architecture
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# files: list of files to check
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#
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# The script reads the supplied files line by line and:
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#
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# 1) for each include statement it checks if the
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# included file actually exists.
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# Only include files located in asm* and linux* are checked.
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# The rest are assumed to be system include files.
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#
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# 2) TODO: check for leaked CONFIG_ symbols
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use strict;
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use warnings;
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my ($dir, $arch, @files) = @ARGV;
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my $ret = 0;
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my $line;
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my $lineno = 0;
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my $filename;
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foreach my $file (@files) {
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$filename = $file;
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open(my $fh, '<', "$filename") or die "$filename: $!\n";
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$lineno = 0;
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while ($line = <$fh>) {
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$lineno++;
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check_include();
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}
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close $fh;
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}
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exit $ret;
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sub check_include
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{
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if ($line =~ m/^\s*#\s*include\s+<((asm|linux).*)>/) {
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my $inc = $1;
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my $found;
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$found = stat($dir . "/" . $inc);
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if (!$found) {
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$inc =~ s#asm/#asm-$arch/#;
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$found = stat($dir . "/" . $inc);
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}
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if (!$found) {
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printf STDERR "$filename:$lineno: included file '$inc' is not exported\n";
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$ret = 1;
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}
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}
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}
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42
scripts/headers_install.pl
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42
scripts/headers_install.pl
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@ -0,0 +1,42 @@
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#!/usr/bin/perl
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#
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# headers_install prepare the listed header files for use in
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# user space and copy the files to their destination.
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#
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# Usage: headers_install.pl odir installdir [files...]
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# odir: dir to open files
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# install: dir to install the files
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# files: list of files to check
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#
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# Step in preparation for users space:
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# 1) Drop all use of compiler.h definitions
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# 2) Drop include of compiler.h
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# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
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use strict;
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use warnings;
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my ($readdir, $installdir, @files) = @ARGV;
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my $unifdef = "scripts/unifdef -U__KERNEL__";
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foreach my $file (@files) {
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my $tmpfile = "$installdir/$file.tmp";
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open(my $infile, '<', "$readdir/$file")
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or die "$readdir/$file: $!\n";
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open(my $outfile, '>', "$tmpfile") or die "$tmpfile: $!\n";
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while (my $line = <$infile>) {
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$line =~ s/([\s(])__user\s/$1/g;
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$line =~ s/([\s(])__force\s/$1/g;
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$line =~ s/([\s(])__iomem\s/$1/g;
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$line =~ s/\s__attribute_const__\s/ /g;
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$line =~ s/\s__attribute_const__$//g;
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$line =~ s/^#include <linux\/compiler.h>//;
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printf $outfile "%s", $line;
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}
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close $outfile;
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close $infile;
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system $unifdef . " $tmpfile > $installdir/$file";
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unlink $tmpfile;
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}
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exit 0;
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