From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932857AbeCOTHy (ORCPT ); Thu, 15 Mar 2018 15:07:54 -0400 Received: from isilmar-4.linta.de ([136.243.71.142]:36298 "EHLO isilmar-4.linta.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932678AbeCOTGY (ORCPT ); Thu, 15 Mar 2018 15:06:24 -0400 From: Dominik Brodowski To: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk Cc: luto@kernel.org, mingo@kernel.org, akpm@linux-foundation.org, arnd@arndb.de Subject: [PATCH v2 00/36] remove in-kernel syscall invocations (part 1) Date: Thu, 15 Mar 2018 20:04:53 +0100 Message-Id: <20180315190529.20943-1-linux@dominikbrodowski.net> X-Mailer: git-send-email 2.16.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Here is a re-spin of the first set of patches which reduce the number of syscall invocations from within the kernel; the RFC may be found at The rationale for this change is described in patch 1 as follows: The syscall entry points to the kernel defined by SYSCALL_DEFINEx() and COMPAT_SYSCALL_DEFINEx() should only be called from userspace through kernel entry points, but not from the kernel itself. This will allow cleanups and optimizations to the entry paths *and* to the parts of the kernel code which currently need to pretend to be userspace in order to make use of syscalls. The whole series can be found at https://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux.git syscalls-next and will be submitted for merging for the v4.17-rc1 cycle, probably together with another batch of related patches I hope to send out tomorrow as a RFC. Changes since the RFC / v1: - rebase to v4.15-rc5; sys_ioperm already got its SYSCALL_DEFINE3 - add ACKs - CC: -> Cc: (suggested by Ingo Molnar) - update comment in include/linux/syscalls.h (suggested by Ingo Molnar and Andy Lutomirski) - separate declarations from definitions with newlines in include/linux/syscalls.h; add comment on ksys_close() (suggested by Ingo Molnar) - expand commit messages (suggested by Christoph Hellwig) - include patch 36: fs: add ksys_open() wrapper; remove in-kernel calls to sys_open() - do not worry about the following archs, as they are going away: cris, frv, metag, mn10300, score, tile (solving conflicts in -next) - fix builds with CONFIG_FUTEX=n, CONFIG_ADVISE_SYSCALLS=n (solving issues found by Stephen Rothwell) Thanks, Dominik Dominik Brodowski (36): syscalls: define goal to not call sys_xyzzy() from within the kernel kernel: use kernel_wait4() instead of sys_wait4() mm: use do_futex() instead of sys_futex() in mm_release() kernel: add do_getpgid() helper; remove internal call to sys_getpgid() fs: add do_readlinkat() helper; remove internal call to sys_readlinkat() fs: add do_pipe2() helper; remove internal call to sys_pipe2() fs: add do_renameat2() helper; remove internal call to sys_renameat2() fs: add do_futimesat() helper; remove internal call to sys_futimesat() syscalls: add do_epoll_*() helpers; remove internal calls to sys_epoll_*() fs: add do_signalfd4() helper; remove internal calls to sys_signalfd4() fs: add do_eventfd() helper; remove internal call to sys_eventfd() kernel: open-code sys_rt_sigpending() in sys_sigpending() x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm() fs: add ksys_mount() helper; remove in-kernel calls to sys_mount() fs: add ksys_umount() helper; remove in-kernel call to sys_umount() fs: add ksys_dup{,3}() helper; remove in-kernel calls to sys_dup{,3}() fs: add ksys_chroot() helper; remove-in kernel calls to sys_chroot() fs: add ksys_write() helper; remove in-kernel calls to sys_write() kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare() mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64() mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff() fs: add ksys_chdir() helper; remove in-kernel calls to sys_chdir() fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall fs: add ksys_unlink() wrapper; remove in-kernel calls to sys_unlink() hostfs: rename do_rmdir() to hostfs_do_rmdir() fs: add ksys_rmdir() wrapper; remove in-kernel calls to sys_rmdir() fs: add do_mkdirat() helper and ksys_mkdir() wrapper; remove in-kernel calls to syscall fs: add do_symlinkat() helper and ksys_symlink() wrapper; remove in-kernel calls to syscall fs: add do_mknodat() helper and ksys_mknod() wrapper; remove in-kernel calls to syscall fs: add do_linkat() helper and ksys_link() wrapper; remove in-kernel calls to syscall fs: add ksys_fchmod() and do_fchmodat() helpers and ksys_chmod() wrapper; remove in-kernel calls to syscall fs: add do_faccessat() helper and ksys_access() wrapper; remove in-kernel calls to syscall fs: add ksys_ftruncate() wrapper; remove in-kernel calls to sys_ftruncate() fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers fs: add ksys_close() wrapper; remove in-kernel calls to sys_close() fs: add ksys_open() wrapper; remove in-kernel calls to sys_open() Documentation/process/adding-syscalls.rst | 14 --- arch/alpha/kernel/osf_sys.c | 2 +- arch/arm/kernel/sys_arm.c | 2 +- arch/arm64/kernel/sys.c | 2 +- arch/ia64/kernel/sys_ia64.c | 4 +- arch/m68k/kernel/sys_m68k.c | 2 +- arch/microblaze/kernel/sys_microblaze.c | 6 +- arch/mips/kernel/linux32.c | 10 +- arch/mips/kernel/syscall.c | 6 +- arch/parisc/kernel/sys_parisc.c | 14 +-- arch/powerpc/kernel/sys_ppc32.c | 8 +- arch/powerpc/kernel/syscalls.c | 6 +- arch/riscv/kernel/sys_riscv.c | 4 +- arch/s390/kernel/compat_linux.c | 23 ++--- arch/s390/kernel/sys_s390.c | 2 +- arch/sh/kernel/sys_sh.c | 4 +- arch/sh/kernel/sys_sh32.c | 8 +- arch/sparc/kernel/sys_sparc32.c | 14 +-- arch/sparc/kernel/sys_sparc_32.c | 6 +- arch/sparc/kernel/sys_sparc_64.c | 2 +- arch/um/kernel/syscall.c | 2 +- arch/x86/ia32/sys_ia32.c | 22 ++--- arch/x86/include/asm/syscalls.h | 1 + arch/x86/kernel/ioport.c | 7 +- arch/x86/kernel/sys_x86_64.c | 2 +- arch/xtensa/kernel/syscall.c | 2 +- drivers/base/devtmpfs.c | 11 ++- drivers/tty/vt/vt_ioctl.c | 6 +- fs/autofs4/dev-ioctl.c | 2 +- fs/binfmt_misc.c | 2 +- fs/eventfd.c | 9 +- fs/eventpoll.c | 23 +++-- fs/file.c | 17 +++- fs/hostfs/hostfs.h | 2 +- fs/hostfs/hostfs_kern.c | 2 +- fs/hostfs/hostfs_user.c | 2 +- fs/internal.h | 14 +++ fs/namei.c | 61 +++++++++---- fs/namespace.c | 19 +++- fs/open.c | 68 ++++++++++---- fs/pipe.c | 9 +- fs/read_write.c | 9 +- fs/signalfd.c | 14 ++- fs/stat.c | 12 ++- fs/sync.c | 12 ++- fs/utimes.c | 13 ++- include/linux/futex.h | 13 ++- include/linux/syscalls.h | 146 +++++++++++++++++++++++++++++- init/do_mounts.c | 16 ++-- init/do_mounts.h | 4 +- init/do_mounts_initrd.c | 38 ++++---- init/do_mounts_md.c | 14 +-- init/do_mounts_rd.c | 18 ++-- init/initramfs.c | 48 +++++----- init/main.c | 9 +- init/noinitramfs.c | 6 +- kernel/exit.c | 2 +- kernel/fork.c | 11 ++- kernel/pid_namespace.c | 6 +- kernel/signal.c | 15 ++- kernel/sys.c | 9 +- kernel/uid16.c | 6 +- kernel/umh.c | 2 +- mm/fadvise.c | 10 +- mm/mmap.c | 17 +++- mm/nommu.c | 17 +++- 66 files changed, 614 insertions(+), 275 deletions(-) -- 2.16.2