Commit 8dfb61dc authored by Denis Efremov's avatar Denis Efremov Committed by Masahiro Yamada
Browse files

kbuild: add variables for compression tools 



Allow user to use alternative implementations of compression tools,
such as pigz, pbzip2, pxz. For example, multi-threaded tools to
speed up the build:
$ make GZIP=pigz BZIP2=pbzip2

Variables _GZIP, _BZIP2, _LZOP are used internally because original env
vars are reserved by the tools. The use of GZIP in gzip tool is obsolete
since 2015. However, alternative implementations (e.g., pigz) still rely
on it. BZIP2, BZIP, LZOP vars are not obsolescent.

The credit goes to @grsecurity.

As a sidenote, for multi-threaded lzma, xz compression one can use:
$ export XZ_OPT="--threads=0"

Signed-off-by: default avatarDenis Efremov <efremov@linux.com>
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent e0b250b5

Makefile

+23 −2
Original line number Diff line number Diff line
@@ -458,6 +458,26 @@ PYTHON = python 
PYTHON3		= python3

CHECK		= sparse

BASH		= bash

GZIP		= gzip

BZIP2		= bzip2

LZOP		= lzop

LZMA		= lzma

LZ4		= lz4c

XZ		= xz



# GZIP, BZIP2, LZOP env vars are used by the tools. Support them as the command

# line interface, but use _GZIP, _BZIP2, _LZOP internally.

_GZIP          := $(GZIP)

_BZIP2         := $(BZIP2)

_LZOP          := $(LZOP)



# Reset GZIP, BZIP2, LZOP in this Makefile

override GZIP=

override BZIP2=

override LZOP=



# Reset GZIP, BZIP2, LZOP in recursive invocations

MAKEOVERRIDES += GZIP= BZIP2= LZOP=



CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \

		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@@ -506,6 +526,7 @@ CLANG_FLAGS := 
export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC

export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL

export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX

export _GZIP _BZIP2 _LZOP LZMA LZ4 XZ

export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE



export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
@@ -1020,10 +1041,10 @@ export mod_strip_cmd 
mod_compress_cmd = true

ifdef CONFIG_MODULE_COMPRESS

  ifdef CONFIG_MODULE_COMPRESS_GZIP

    mod_compress_cmd = gzip -n -f

    mod_compress_cmd = $(_GZIP) -n -f

  endif # CONFIG_MODULE_COMPRESS_GZIP

  ifdef CONFIG_MODULE_COMPRESS_XZ

    mod_compress_cmd = xz -f

    mod_compress_cmd = $(XZ) -f

  endif # CONFIG_MODULE_COMPRESS_XZ

endif # CONFIG_MODULE_COMPRESS

export mod_compress_cmd

arch/arm/boot/deflate_xip_data.sh

+1 −1
Original line number Diff line number Diff line
@@ -56,7 +56,7 @@ trap 'rm -f "$XIPIMAGE.tmp"; exit 1' 1 2 3 
# substitute the data section by a compressed version

$DD if="$XIPIMAGE" count=$data_start iflag=count_bytes of="$XIPIMAGE.tmp"

$DD if="$XIPIMAGE"  skip=$data_start iflag=skip_bytes |

gzip -9 >> "$XIPIMAGE.tmp"

$_GZIP -9 >> "$XIPIMAGE.tmp"



# replace kernel binary

mv -f "$XIPIMAGE.tmp" "$XIPIMAGE"

arch/ia64/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -40,7 +40,7 @@ $(error Sorry, you need a newer version of the assember, one that is built from 
endif



quiet_cmd_gzip = GZIP    $@

cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@

cmd_gzip = cat $(real-prereqs) | $(_GZIP) -n -f -9 > $@



quiet_cmd_objcopy = OBJCOPY $@

cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

arch/m68k/Makefile

+4 −4
Original line number Diff line number Diff line
@@ -135,10 +135,10 @@ vmlinux.gz: vmlinux 
ifndef CONFIG_KGDB

	cp vmlinux vmlinux.tmp

	$(STRIP) vmlinux.tmp

	gzip -9c vmlinux.tmp >vmlinux.gz

	$(_GZIP) -9c vmlinux.tmp >vmlinux.gz

	rm vmlinux.tmp

else

	gzip -9c vmlinux >vmlinux.gz

	$(_GZIP) -9c vmlinux >vmlinux.gz

endif



bzImage: vmlinux.bz2
@@ -148,10 +148,10 @@ vmlinux.bz2: vmlinux 
ifndef CONFIG_KGDB

	cp vmlinux vmlinux.tmp

	$(STRIP) vmlinux.tmp

	bzip2 -1c vmlinux.tmp >vmlinux.bz2

	$(_BZIP2) -1c vmlinux.tmp >vmlinux.bz2

	rm vmlinux.tmp

else

	bzip2 -1c vmlinux >vmlinux.bz2

	$(_BZIP2) -1c vmlinux >vmlinux.bz2

endif



archclean:

arch/parisc/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -162,7 +162,7 @@ vmlinuz: bzImage 
	$(OBJCOPY) $(boot)/bzImage $@

else

vmlinuz: vmlinux

	@gzip -cf -9 $< > $@

	@$(_GZIP) -cf -9 $< > $@

endif



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