arch: System call unification and cleanup

The system call tables have diverged a bit over the years, and a number
of the recent additions never made it into all architectures, for one
reason or another.

This is an attempt to clean it up as far as we can without breaking
compatibility, doing a number of steps:

- Add system calls that have not yet been integrated into all
  architectures but that we definitely want there. This includes
  {,f}statfs64() and get{eg,eu,g,p,u,pp}id() on alpha, which have
  been missing traditionally.

- The s390 compat syscall handling is cleaned up to be more like
  what we do on other architectures, while keeping the 31-bit
  pointer extension. This was merged as a shared branch by the
  s390 maintainers and is included here in order to base the other
  patches on top.

- Add the separate ipc syscalls on all architectures that
  traditionally only had sys_ipc(). This version is done without
  support for IPC_OLD that is we have in sys_ipc. The
  new semtimedop_time64 syscall will only be added here, not
  in sys_ipc

- Add syscall numbers for a couple of syscalls that we probably
  don't need everywhere, in particular pkey_* and rseq,
  for the purpose of symmetry: if it's in asm-generic/unistd.h,
  it makes sense to have it everywhere. I expect that any future
  system calls will get assigned on all platforms together, even
  when they appear to be specific to a single architecture.

- Prepare for having the same system call numbers for any future
  calls. In combination with the generated tables, this hopefully
  makes it easier to add new calls across all architectures
  together.

All of the above are technically separate from the y2038 work,
but are done as preparation before we add the new 64-bit time_t
system calls everywhere, providing a common baseline set of system
calls.

I expect that glibc and other libraries that want to use 64-bit
time_t will require linux-5.1 kernel headers for building in
the future, and at a much later point may also require linux-5.1
or a later version as the minimum kernel at runtime. Having a
common baseline then allows the removal of many architecture or
kernel version specific workarounds.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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syscalls: remove obsolete __IGNORE_ macros

These are all for ignoring the lack of obsolete system calls,
which have been marked the same way in scripts/checksyscall.sh,
so these can be removed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
4 files changed