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    SubjectRe: [PATCH v2 13/29] arch: add split IPC system calls where needed
    On Fri, Jan 18, 2019 at 05:18:19PM +0100, Arnd Bergmann wrote:
    > The IPC system call handling is highly inconsistent across architectures,
    > some use sys_ipc, some use separate calls, and some use both. We also
    > have some architectures that require passing IPC_64 in the flags, and
    > others that set it implicitly.
    >
    > For the additon of a y2083 safe semtimedop() system call, I chose to only
    > support the separate entry points, but that requires first supporting
    > the regular ones with their own syscall numbers.
    >
    > The IPC_64 is now implied by the new semctl/shmctl/msgctl system
    > calls even on the architectures that require passing it with the ipc()
    > multiplexer.
    >
    > I'm not adding the new semtimedop() or semop() on 32-bit architectures,
    > those will get implemented using the new semtimedop_time64() version
    > that gets added along with the other time64 calls.
    > Three 64-bit architectures (powerpc, s390 and sparc) get semtimedop().
    >
    > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
    > ---
    > One aspect here that might be a bit controversial is the use of
    > the same system call numbers across all architectures, synchronizing
    > all of them with the x86-32 numbers. With the new syscall.tbl
    > files, I hope we can just keep doing that in the future, and no
    > longer require the architecture maintainers to assign a number.
    >
    > This is mainly useful for implementers of the C libraries: if
    > we can add future system calls everywhere at the same time, using
    > a particular version of the kernel headers also guarantees that
    > the system call number macro is visible.
    > ---
    > arch/m68k/kernel/syscalls/syscall.tbl | 11 +++++++++++
    > arch/mips/kernel/syscalls/syscall_o32.tbl | 11 +++++++++++
    > arch/powerpc/kernel/syscalls/syscall.tbl | 13 +++++++++++++
    > arch/s390/kernel/syscalls/syscall.tbl | 12 ++++++++++++
    > arch/sh/kernel/syscalls/syscall.tbl | 11 +++++++++++
    > arch/sparc/kernel/syscalls/syscall.tbl | 12 ++++++++++++
    > arch/x86/entry/syscalls/syscall_32.tbl | 11 +++++++++++
    > 7 files changed, 81 insertions(+)

    For the s390 bits:
    Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>

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