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Subject[RFC PATCH v2] kbuild: add variables for compression tools
Date
Allow user to use alternative implementations of compression tools.
For example, multi-threaded tools to speed up the build:
$ make GZIP=pigz BZIP2=pbzip2

Variable _GZIP is used internally instead of GZIP because the latter is
reserved by the tool. The use of GZIP in gzip tool is obsolete since
2015. However, alternative implementations (e.g., pigz) can still rely
on it.

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>
---

Compile tested on x86_64, parisc, arm64, mips, m68k.

Makefile | 16 ++++++++++++++--
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 | 4 ++++
scripts/Makefile.lib | 12 ++++++------
scripts/Makefile.package | 8 ++++----
scripts/package/buildtar | 15 ++++++++++++---
scripts/xz_wrap.sh | 6 +++++-
12 files changed, 62 insertions(+), 25 deletions(-)

diff --git a/Makefile b/Makefile
index 04f5662ae61a..dd5ff189d97e 100644
--- a/Makefile
+++ b/Makefile
@@ -447,6 +447,12 @@ PYTHON = python
PYTHON3 = python3
CHECK = sparse
BASH = bash
+GZIP = gzip
+BZIP2 = bzip2
+LZMA = lzma
+LZO = lzop
+LZ4 = lz4c
+XZ = xz

CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@@ -492,10 +498,16 @@ KBUILD_LDFLAGS :=
GCC_PLUGINS_CFLAGS :=
CLANG_FLAGS :=

+# GZIP env var is used by old (<= 2015) versions of the tool
+# and alternative implementations for additional arguments
+override _GZIP=$(GZIP)
+unexport GZIP
+
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 LZMA LZO LZ4 XZ

export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
@@ -1005,10 +1017,10 @@ 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..7f259a723753 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..d7c25b3cb1a8 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -2,6 +2,10 @@
####
# kbuild: Generic definitions

+# GZIP env var is used by old (<= 2015) versions of the tool
+# and alternative implementations for additional arguments
+unexport GZIP
+
# Convenient variables
comma := ,
quote := "
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 4b799737722c..812f1c0e5beb 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) | $(LZO) -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..537179828d0c 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..8a0ebcc292af 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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