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Subject[RFC PATCH] 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 KGZIP=pigz KXZ=pxz

Variable KGZIP is used instead of GZIP because the latter is reserved
by the tool. Other variables are prefixed with 'K' for consistency.

The credit goes to @grsecurity.

Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Denis Efremov <efremov@linux.com>
---
Makefile | 11 +++++++++--
arch/arm/boot/deflate_xip_data.sh | 6 +++++-
arch/ia64/Makefile | 2 +-
arch/m68k/Makefile | 4 ++--
arch/mips/lasat/image/Makefile | 2 +-
arch/parisc/Makefile | 2 +-
kernel/gen_kheaders.sh | 6 +++++-
scripts/Makefile.lib | 12 ++++++------
scripts/Makefile.package | 6 +++---
scripts/xz_wrap.sh | 6 +++++-
10 files changed, 38 insertions(+), 19 deletions(-)

diff --git a/Makefile b/Makefile
index 11fe9b1535de..9af13cfeed7a 100644
--- a/Makefile
+++ b/Makefile
@@ -447,6 +447,12 @@ PYTHON = python
PYTHON3 = python3
CHECK = sparse
BASH = bash
+KGZIP = gzip
+KBZIP2 = bzip2
+KLZMA = lzma
+KLZOP = lzop
+KLZ4 = lz4c
+KXZ = xz

CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@@ -496,6 +502,7 @@ export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD
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 KGZIP KBZIP2 KLZMA KLZOP KLZ4 KXZ

export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
@@ -1005,10 +1012,10 @@ 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 = $(KGZIP) -n -f
endif # CONFIG_MODULE_COMPRESS_GZIP
ifdef CONFIG_MODULE_COMPRESS_XZ
- mod_compress_cmd = xz -f
+ mod_compress_cmd = $(KXZ) -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..08dd50e08c17 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$KGZIP = "x" ]; then
+ KGZIP=gzip
+fi
+
# Use "make V=1" to debug this script.
case "$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"
+$KGZIP -9 >> "$XIPIMAGE.tmp"

# replace kernel binary
mv -f "$XIPIMAGE.tmp" "$XIPIMAGE"
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 32240000dc0c..2876a7df1b0a 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) | $(KGZIP) -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..e6c7c92aa72e 100644
--- a/arch/m68k/Makefile
+++ b/arch/m68k/Makefile
@@ -148,10 +148,10 @@ vmlinux.bz2: vmlinux
ifndef CONFIG_KGDB
cp vmlinux vmlinux.tmp
$(STRIP) vmlinux.tmp
- bzip2 -1c vmlinux.tmp >vmlinux.bz2
+ $(KBZIP2) -1c vmlinux.tmp >vmlinux.bz2
rm vmlinux.tmp
else
- bzip2 -1c vmlinux >vmlinux.bz2
+ $(KBZIP2) -1c vmlinux >vmlinux.bz2
endif

archclean:
diff --git a/arch/mips/lasat/image/Makefile b/arch/mips/lasat/image/Makefile
index 78ce4cff1012..617ccb1659d5 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 $< > $@
+ $(KGZIP) -cf -9 $< > $@

$(obj)/kImage.bin: $(KERNEL_IMAGE)
$(OBJCOPY) -O binary -S $^ $@
diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 628cd8bb7ad8..412ddec0297d 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -162,7 +162,7 @@ vmlinuz: bzImage
$(OBJCOPY) $(boot)/bzImage $@
else
vmlinuz: vmlinux
- @gzip -cf -9 $< > $@
+ @$(KGZIP) -cf -9 $< > $@
endif

install:
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index e13ca842eb7e..f3dfaf9f6647 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$KXZ = "x" ]; then
+ KXZ=xz
+fi
+
dir_list="
include/
arch/$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 $KXZ -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/Makefile.lib b/scripts/Makefile.lib
index 4b799737722c..dd38f5ac8d48 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) | $(KGZIP) -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) | $(KBZIP2) -9; $(size_append); } > $@

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

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

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

quiet_cmd_lz4 = LZ4 $@
- cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \
+ cmd_lz4 = { cat $(real-prereqs) | $(KLZ4) -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) | $(KXZ) --check=crc32 --lzma2=dict=1MiB > $@

# ASM offsets
# ---------------------------------------------------------------------------
diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index 02135d2671a6..1b91fe1bfcdb 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -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 $(findstring bz2,$@),$(KBZIP2), \
+$(if $(findstring gz,$@),$(KGZIP), \
+$(if $(findstring xz,$@),$(KXZ), \
$(error unknown target $@)))) \
-f -9 $(perf-tar).tar)

diff --git a/scripts/xz_wrap.sh b/scripts/xz_wrap.sh
index 7a2d372f4885..4922102dbfe7 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$KXZ = "x" ]; then
+ KXZ=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 $KXZ --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB
--
2.25.4
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