On Thursday 31 July 2008, Paul Mundt wrote:
This sort of merging is fairly easy to do incrementally, at least by
someone that has both platforms available. An easy first step would be to
move the m68knommu stuff that are implemented differently over as _nommu
files, similar to how the _32/_64 renames happened, and then set about
converging the two little by little. This is what I've been doing with
sh64->sh integration for example, despite fundamental differences like
having a totally different register layout and instruction set.
I've played around with the purely mechanical side of merging the
m68k{,nommu} header files and came up with a script to do it.
All headers that are identical are used from their m68k variant, the
others get an #include magic like x86 has it for 32/64.
This assumes that the kernel ABI is compatible and that user space
can actually use the m68k headers for m68knommu as well.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
TARGET=arch/m68k/include/asm
SOURCE1=include/asm-m68k
SOURCE2=include/asm-m68knommu
FILES="atomic.h bitops.h bootinfo.h bug.h bugs.h byteorder.h cache.h \
cacheflush.h checksum.h cputime.h current.h delay.h div64.h \
dma-mapping.h dma.h elf.h entry.h fb.h fpu.h hardirq.h hw_irq.h io.h \
irq.h kmap_types.h local.h machdep.h mc146818rtc.h mmu.h mmu_context.h \
module.h page.h page_offset.h param.h pci.h percpu.h pgalloc.h \
pgtable.h processor.h ptrace.h scatterlist.h sections.h segment.h \
setup.h sigcontext.h siginfo.h signal.h string.h system.h \
thread_info.h timex.h tlbflush.h traps.h uaccess.h ucontext.h \
unaligned.h unistd.h"
EXPORTS="byteorder param ptrace sigcontext siginfo signal unistd"
mergefile() {
BASE=${1%.h}
mv $SOURCE1/$1 $TARGET/${BASE}_mmu.h
mv $SOURCE2/$1 $TARGET/${BASE}_nommu.h
cat << EOF > $TARGET/$1
#ifdef __KERNEL__
#ifdef CONFIG_MMU
#include "${BASE}_mmu.h"
#else
#include "${BASE}_nommu.h"
#endif
#else
#include "${BASE}_mmu.h"
#endif
EOF
}
mergefile2() {
if [ -e ${TARGET}/$1 ] ; then
rm $SOURCE2/$1
else
mv $SOURCE2/$1 ${TARGET}
fi
}
addexport() {
echo "unifdef-y += ${1}_mmu.h" >> $TARGET/Kbuild
}
mkdir -p ${TARGET}
# first the incompatible files
for i in $FILES ; do mergefile $i ; done
# move all the remaining m68k files
mv include/asm-m68k/* arch/m68k/include/asm/
# add a few files that are present only on nommu,
# remove the duplicate nommu files.
for i in `ls include/asm-m68knommu/` ; do mergefile2 $i ; done
# make sure the new files get exported where needed.
for i in $EXPORTS ; do addexport $i ; done
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