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kernel: Use hardlinks during do_install for speed

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Whilst the comment says we can't do this, its incorrect, install operates
on WORKDIR and its hard for different parts of WORKDIR to be on different
filesystems. Hardlinking instead of copying is therefore a nice performance
gain.

Also, completely skip the Documentation directory (adding a dummy Makefile
to keep make happy) and tweak the other cp commands to link since if we
don't we'd get "this is the same file" type errors from cp for some kernel
versions.

For do_install on linux-yocto, this takes it from 227s -> 84s.

(From OE-Core rev: 0727e510f8533216518563b1533e804a1dc44402)

(From OE-Core rev: f6e98af6b9f6729bb61f17e3b4203c3c79829205)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie
2013-11-08 15:17:07 +00:00
parent 4fdc3d77d4
commit 5e73287ad8
1 changed files with 9 additions and 9 deletions
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18
meta/classes/kernel.bbclass
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@@ -236,20 +236,21 @@ kernel_do_install() {
# dir. This ensures the original Makefiles are used and not the
# redirecting Makefiles in the build directory.
#
# work and sysroots can be on different partitions, so we can't rely on
# hardlinking, unfortunately.
#
find . -depth -not -name "*.cmd" -not -name "*.o" -not -path "./.*" -print0 | cpio --null -pdu $kerneldir
find . -depth -not -name "*.cmd" -not -name "*.o" -not -path "./Documentation*" -not -path "./.*" -print0 | cpio --null -pdlu $kerneldir
cp .config $kerneldir
if [ "${S}" != "${B}" ]; then
pwd="$PWD"
cd "${S}"
find . -depth -not -path "./.*" -print0 | cpio --null -pdu $kerneldir
find . -depth -not -path "./Documentation*" -not -path "./.*" -print0 | cpio --null -pdlu $kerneldir
cd "$pwd"
fi
install -m 0644 ${KERNEL_OUTPUT} $kerneldir/${KERNEL_IMAGETYPE}
install -m 0644 System.map $kerneldir/System.map-${KERNEL_VERSION}
# Dummy Makefile so the clean below works
mkdir $kerneldir/Documentation
touch $kerneldir/Documentation/Makefile
#
# Clean and remove files not needed for building modules.
# Some distributions go through a lot more trouble to strip out
@@ -262,22 +263,21 @@ kernel_do_install() {
oe_runmake -C $kerneldir CC="${KERNEL_CC}" LD="${KERNEL_LD}" clean
make -C $kerneldir _mrproper_scripts
find $kerneldir -path $kerneldir/lib -prune -o -path $kerneldir/tools -prune -o -path $kerneldir/scripts -prune -o -name "*.[csS]" -exec rm '{}' \;
find $kerneldir/Documentation -name "*.txt" -exec rm '{}' \;
# As of Linux kernel version 3.0.1, the clean target removes
# arch/powerpc/lib/crtsavres.o which is present in
# KBUILD_LDFLAGS_MODULE, making it required to build external modules.
if [ ${ARCH} = "powerpc" ]; then
cp arch/powerpc/lib/crtsavres.o $kerneldir/arch/powerpc/lib/crtsavres.o
cp -l arch/powerpc/lib/crtsavres.o $kerneldir/arch/powerpc/lib/crtsavres.o
fi
# Necessary for building modules like compat-wireless.
if [ -f include/generated/bounds.h ]; then
cp include/generated/bounds.h $kerneldir/include/generated/bounds.h
cp -l include/generated/bounds.h $kerneldir/include/generated/bounds.h
fi
if [ -d arch/${ARCH}/include/generated ]; then
mkdir -p $kerneldir/arch/${ARCH}/include/generated/
cp -fR arch/${ARCH}/include/generated/* $kerneldir/arch/${ARCH}/include/generated/
cp -flR arch/${ARCH}/include/generated/* $kerneldir/arch/${ARCH}/include/generated/
fi
# Remove the following binaries which cause strip or arch QA errors