let import_iovec deal with compat_iovecs as well v3

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Hi Al,

this series changes import_iovec to transparently deal with comat iovec
structures, and then cleanups up a lot of code dupliation.

Changes since v2:
 - revert the switch of the access process vm sysclls to iov_iter
 - refactor the import_iovec internals differently
 - switch aio to use __import_iovec

Changes since v1:
 - improve a commit message
 - drop a pointless unlikely
 - drop the PF_FORCE_COMPAT flag
 - add a few more cleanups (including two from David Laight)

Diffstat:
 arch/arm64/include/asm/unistd32.h                  |   10 
 arch/mips/kernel/syscalls/syscall_n32.tbl          |   10 
 arch/mips/kernel/syscalls/syscall_o32.tbl          |   10 
 arch/parisc/kernel/syscalls/syscall.tbl            |   10 
 arch/powerpc/kernel/syscalls/syscall.tbl           |   10 
 arch/s390/kernel/syscalls/syscall.tbl              |   10 
 arch/sparc/kernel/syscalls/syscall.tbl             |   10 
 arch/x86/entry/syscall_x32.c                       |    5 
 arch/x86/entry/syscalls/syscall_32.tbl             |   10 
 arch/x86/entry/syscalls/syscall_64.tbl             |   10 
 block/scsi_ioctl.c                                 |   12 
 drivers/scsi/sg.c                                  |    9 
 fs/aio.c                                           |   38 --
 fs/io_uring.c                                      |   20 -
 fs/read_write.c                                    |  362 +--------------------
 fs/splice.c                                        |   57 ---
 include/linux/compat.h                             |   24 -
 include/linux/fs.h                                 |   11 
 include/linux/uio.h                                |   10 
 include/uapi/asm-generic/unistd.h                  |   12 
 lib/iov_iter.c                                     |  161 +++++++--
 mm/process_vm_access.c                             |   85 ----
 net/compat.c                                       |    4 
 security/keys/compat.c                             |   37 --
 security/keys/internal.h                           |    5 
 security/keys/keyctl.c                             |    2 
 tools/include/uapi/asm-generic/unistd.h            |   12 
 tools/perf/arch/powerpc/entry/syscalls/syscall.tbl |   10 
 tools/perf/arch/s390/entry/syscalls/syscall.tbl    |   10 
 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl  |   10 
 30 files changed, 280 insertions(+), 706 deletions(-)



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