On Tue, Nov 26, 2019 at 12:00 AM Richard Weinberger <richard.weinberger@xxxxxxxxx> wrote: > > On Fri, Nov 8, 2019 at 6:03 AM Hajime Tazaki <thehajime@xxxxxxxxx> wrote: > > > > From: Octavian Purdila <tavi.purdila@xxxxxxxxx> > > > > Adds the LKL Kconfig, vmlinux linker script, basic architecture > > headers and miscellaneous basic functions or stubs such as > > dump_stack(), show_regs() and cpuinfo proc ops. > > > > The headers we introduce in this patch are simple wrappers to the > > asm-generic headers or stubs for things we don't support, such as > > ptrace, DMA, signals, ELF handling and low level processor operations. > > > > The kernel configuration is automatically updated to reflect the > > endianness of the host, 64bit support or the output format for > > vmlinux's linker script. We do this by looking at the ld's default > > output format. > > > > Signed-off-by: Andreas Abel <aabel@xxxxxxxxxx> > > Signed-off-by: Conrad Meyer <cem@xxxxxxxxxxx> > > Signed-off-by: Edison M. Castro <edisonmcastro@xxxxxxxxxxx> > > Signed-off-by: H.K. Jerry Chu <hkchu@xxxxxxxxxx> > > Signed-off-by: Hajime Tazaki <thehajime@xxxxxxxxx> > > Signed-off-by: Jens Staal <staal1978@xxxxxxxxx> > > Signed-off-by: Lai Jiangshan <jiangshanlai@xxxxxxxxx> > > Signed-off-by: Levente Kurusa <levex@xxxxxxxxx> > > Signed-off-by: Luca Dariz <luca.dariz@xxxxxxxxx> > > Signed-off-by: Mark Stillwell <mark@xxxxxxxxxxxx> > > Signed-off-by: Matthieu Coudron <mattator@xxxxxxxxx> > > Signed-off-by: Michael Zimmermann <sigmaepsilon92@xxxxxxxxx> > > Signed-off-by: Motomu Utsumi <motomuman@xxxxxxxxx> > > Signed-off-by: Patrick Collins <pscollins@xxxxxxxxxx> > > Signed-off-by: Petros Angelatos <petrosagg@xxxxxxxxx> > > Signed-off-by: Pierre-Hugues Husson <phh@xxxxxx> > > Signed-off-by: Xiao Jia <xiaoj@xxxxxxxxxx> > > Signed-off-by: Yuan Liu <liuyuan@xxxxxxxxxx> > > Signed-off-by: Octavian Purdila <tavi.purdila@xxxxxxxxx> > > Can we please have this chain cleaned up? > Please see process/submitting-patches.rst. > > > --- > > MAINTAINERS | 8 + > > arch/um/lkl/.gitignore | 2 + > > arch/um/lkl/Kconfig | 95 ++++++ > > arch/um/lkl/Kconfig.debug | 0 > > arch/um/lkl/configs/lkl_defconfig | 91 ++++++ > > arch/um/lkl/include/asm/Kbuild | 80 +++++ > > arch/um/lkl/include/asm/bitsperlong.h | 11 + > > arch/um/lkl/include/asm/byteorder.h | 7 + > > arch/um/lkl/include/asm/cpu.h | 14 + > > arch/um/lkl/include/asm/elf.h | 15 + > > arch/um/lkl/include/asm/mutex.h | 7 + > > arch/um/lkl/include/asm/processor.h | 60 ++++ > > arch/um/lkl/include/asm/ptrace.h | 25 ++ > > arch/um/lkl/include/asm/sched.h | 23 ++ > > arch/um/lkl/include/asm/syscalls.h | 18 ++ > > arch/um/lkl/include/asm/syscalls_32.h | 43 +++ > > arch/um/lkl/include/asm/tlb.h | 12 + > > arch/um/lkl/include/asm/uaccess.h | 64 ++++ > > arch/um/lkl/include/asm/unistd_32.h | 31 ++ > > arch/um/lkl/include/asm/vmlinux.lds.h | 14 + > > arch/um/lkl/include/asm/xor.h | 9 + > > arch/um/lkl/include/uapi/asm/Kbuild | 9 + > > arch/um/lkl/include/uapi/asm/bitsperlong.h | 13 + > > arch/um/lkl/include/uapi/asm/byteorder.h | 11 + > > arch/um/lkl/include/uapi/asm/siginfo.h | 11 + > > arch/um/lkl/include/uapi/asm/swab.h | 11 + > > arch/um/lkl/include/uapi/asm/syscalls.h | 348 +++++++++++++++++++++ > > I think this is the first big thing which needs a unification. > > In UML we try hard to re-use headers from x86. > We also have some headers in arch/x86/um/. > > LKL should do the same. At least try hard to avoid duplication. > In LKL we tried to avoid coupling the kernel build part to a particular architecture, to make it easier to port it (to different arches, but as well to other OSes or special environments [1][2]). That is the main reason for having two build steps, one for kernel proper, and one for the host. That is why the host part was placed into tools/lkl to make it clear that is not part of the kernel proper. I think this is one of the biggest differences between UML and LKL and it would be helpful to get feedback of what people think of a potential similar split for UML. [1] https://www.haiku-os.org/blog/lucian/2010-07-08_booting_lkl_inside_haiku/ [2] https://github.com/lkl/lkl-ntk-driver-poc
