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Subject[RFC PATCH v3] kbuild: add variables for compression tools
Date
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 The use of GZIP in gzip tool is obsolete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: Denis Efremov <efremov@linux.com>
---
Changes in v2:
- _GZIP used instead of GZIP
- tar commands altered to use tools from the vars
Changes in v3:
- _BZIP2 used instead of BZIP2
- _LZOP used instead of LZOP

Makefile | 19 +++++++++++++++++--
arch/arm/boot/deflate_xip_data.sh | 6 +++++-
arch/ia64/Makefile | 2 +-
arch/m68k/Makefile | 8 ++++----
arch/mips/lasat/image/Makefile | 2 +-
arch/parisc/Makefile | 2 +-
kernel/gen_kheaders.sh | 6 +++++-
scripts/Kbuild.include | 5 +++++
scripts/Makefile.lib | 12 ++++++------
scripts/Makefile.package | 8 ++++----
scripts/package/buildtar | 15 ++++++++++++---
scripts/xz_wrap.sh | 6 +++++-
12 files changed, 66 insertions(+), 25 deletions(-)

diff --git a/Makefile b/Makefile
index f0d118b86287..2ac2dc87f903 100644
--- a/Makefile
+++ b/Makefile
@@ -447,6 +447,12 @@ PYTHON = python
PYTHON3 = python3
CHECK = sparse
BASH = bash
+GZIP = gzip
+BZIP2 = bzip2
+LZOP = lzop
+LZMA = lzma
+LZ4 = lz4c
+XZ = xz

CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@@ -492,10 +498,19 @@ KBUILD_LDFLAGS :=
GCC_PLUGINS_CFLAGS :=
CLANG_FLAGS :=

+# GZIP, BZIP2, LZOP env vars are used by the tools
+override _GZIP=$(GZIP)
+override _BZIP2=$(BZIP2)
+override _LZOP=$(LZOP)
+unexport GZIP
+unexport BZIP2
+unexport LZOP
+
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 KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
+export _GZIP _BZIP2 _LZOP LZMA LZ4 XZ

export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
@@ -1005,10 +1020,10 @@ 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
diff --git a/arch/arm/boot/deflate_xip_data.sh b/arch/arm/boot/deflate_xip_data.sh
index 40937248cebe..81253142d2ae 100755
--- a/arch/arm/boot/deflate_xip_data.sh
+++ b/arch/arm/boot/deflate_xip_data.sh
@@ -19,6 +19,10 @@ XIPIMAGE="$2"

DD="dd status=none"

+if [ x$_GZIP = "x" ]; then
+ _GZIP=gzip
+fi
+
# Use "make V=1" to debug this script.
case "$KBUILD_VERBOSE" in
*1*)
@@ -56,7 +60,7 @@ 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"
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 32240000dc0c..f817f3d5e758 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -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)) $< $@
diff --git a/arch/m68k/Makefile b/arch/m68k/Makefile
index 5d9288384096..ce6db5e5a5a3 100644
--- a/arch/m68k/Makefile
+++ b/arch/m68k/Makefile
@@ -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:
diff --git a/arch/mips/lasat/image/Makefile b/arch/mips/lasat/image/Makefile
index 78ce4cff1012..24d8dbde1109 100644
--- a/arch/mips/lasat/image/Makefile
+++ b/arch/mips/lasat/image/Makefile
@@ -44,7 +44,7 @@ $(obj)/%.o: $(obj)/%.gz
$(LD) -r -o $@ -b binary $<

$(obj)/%.gz: $(obj)/%.bin
- gzip -cf -9 $< > $@
+ $(_GZIP) -cf -9 $< > $@

$(obj)/kImage.bin: $(KERNEL_IMAGE)
$(OBJCOPY) -O binary -S $^ $@
diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 628cd8bb7ad8..e1aa514aeb36 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -162,7 +162,7 @@ vmlinuz: bzImage
$(OBJCOPY) $(boot)/bzImage $@
else
vmlinuz: vmlinux
- @gzip -cf -9 $< > $@
+ @$(_GZIP) -cf -9 $< > $@
endif

install:
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index e13ca842eb7e..58e05b3702f3 100755
--- a/kernel/gen_kheaders.sh
+++ b/kernel/gen_kheaders.sh
@@ -9,6 +9,10 @@ outdir="$(pwd)"
tarfile=$1
cpio_dir=$outdir/$tarfile.tmp

+if [ x$XZ = "x" ]; then
+ XZ=xz
+fi
+
dir_list="
include/
arch/$SRCARCH/include/
@@ -88,7 +92,7 @@ find $cpio_dir -type f -print0 |
find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \
tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
--owner=0 --group=0 --numeric-owner --no-recursion \
- -Jcf $tarfile -C $cpio_dir/ -T - > /dev/null
+ -I $XZ -cf $tarfile -C $cpio_dir/ -T - > /dev/null

echo $headers_md5 > kernel/kheaders.md5
echo "$this_file_md5" >> kernel/kheaders.md5
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 6cabf20ce66a..b3b49fe7f25f 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -2,6 +2,11 @@
####
# kbuild: Generic definitions

+# GZIP, BZIP2, LZOP env vars are used by the tools
+unexport GZIP
+unexport BZIP2
+unexport LZOP
+
# Convenient variables
comma := ,
quote := "
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 4b799737722c..a1c1424e6b52 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -241,7 +241,7 @@ cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
# ---------------------------------------------------------------------------

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

# DTC
# ---------------------------------------------------------------------------
@@ -334,19 +334,19 @@ printf "%08x\n" $$dec_size | \
)

quiet_cmd_bzip2 = BZIP2 $@
- cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@
+ cmd_bzip2 = { cat $(real-prereqs) | $(_BZIP2) -9; $(size_append); } > $@

# Lzma
# ---------------------------------------------------------------------------

quiet_cmd_lzma = LZMA $@
- cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@
+ cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@

quiet_cmd_lzo = LZO $@
- cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@
+ cmd_lzo = { cat $(real-prereqs) | $(_LZOP) -9; $(size_append); } > $@

quiet_cmd_lz4 = LZ4 $@
- cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
+ cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
$(size_append); } > $@

# U-Boot mkimage
@@ -393,7 +393,7 @@ quiet_cmd_xzkern = XZKERN $@
$(size_append); } > $@

quiet_cmd_xzmisc = XZMISC $@
- cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@
+ cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@

# ASM offsets
# ---------------------------------------------------------------------------
diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index 02135d2671a6..b2b6153af63a 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -45,7 +45,7 @@ if test "$(objtree)" != "$(srctree)"; then \
false; \
fi ; \
$(srctree)/scripts/setlocalversion --save-scmversion; \
-tar -cz $(RCS_TAR_IGNORE) -f $(2).tar.gz \
+tar -I $(_GZIP) -c $(RCS_TAR_IGNORE) -f $(2).tar.gz \
--transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3); \
rm -f $(objtree)/.scmversion

@@ -127,9 +127,9 @@ util/PERF-VERSION-GEN $(CURDIR)/$(perf-tar)/); \
tar rf $(perf-tar).tar $(perf-tar)/HEAD $(perf-tar)/PERF-VERSION-FILE; \
rm -r $(perf-tar); \
$(if $(findstring tar-src,$@),, \
-$(if $(findstring bz2,$@),bzip2, \
-$(if $(findstring gz,$@),gzip, \
-$(if $(findstring xz,$@),xz, \
+$(if $(findstring bz2,$@),$(_BZIP2), \
+$(if $(findstring gz,$@),$(_GZIP), \
+$(if $(findstring xz,$@),$(XZ), \
$(error unknown target $@)))) \
-f -9 $(perf-tar).tar)

diff --git a/scripts/package/buildtar b/scripts/package/buildtar
index 77c7caefede1..165826c12da9 100755
--- a/scripts/package/buildtar
+++ b/scripts/package/buildtar
@@ -19,6 +19,15 @@ set -e
tmpdir="${objtree}/tar-install"
tarball="${objtree}/linux-${KERNELRELEASE}-${ARCH}.tar"

+if [ x$_GZIP = "x" ]; then
+ _GZIP=gzip
+fi
+if [ x$_BZIP2 = "x" ]; then
+ _BZIP2=bzip2
+fi
+if [ x$XZ = "x" ]; then
+ XZ=xz
+fi

#
# Figure out how to compress, if requested at all
@@ -28,15 +37,15 @@ case "${1}" in
opts=
;;
targz-pkg)
- opts=--gzip
+ opts="-I ${_GZIP}"
tarball=${tarball}.gz
;;
tarbz2-pkg)
- opts=--bzip2
+ opts="-I ${_BZIP2}"
tarball=${tarball}.bz2
;;
tarxz-pkg)
- opts=--xz
+ opts="-I ${XZ}"
tarball=${tarball}.xz
;;
*)
diff --git a/scripts/xz_wrap.sh b/scripts/xz_wrap.sh
index 7a2d372f4885..b387cd208952 100755
--- a/scripts/xz_wrap.sh
+++ b/scripts/xz_wrap.sh
@@ -9,6 +9,10 @@
# You can do whatever you want with this file.
#

+if [ x$XZ = "x" ]; then
+ XZ=xz
+fi
+
BCJ=
LZMA2OPTS=

@@ -20,4 +24,4 @@ case $SRCARCH in
sparc) BCJ=--sparc ;;
esac

-exec xz --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB
+exec $XZ --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB
--
2.26.2
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