netdev - let import_iovec deal with compat

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Date:   Fri, 25 Sep 2020 06:51:37 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        David Laight <David.Laight@...lab.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, io-uring@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: let import_iovec deal with compat_iovecs as well v4

Hi Al,

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

Changes since v3:
 - fix up changed prototypes in compat.h as well

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(-)