Re: [PATCH 00/26] Linux cleanups enabled by built-in system call tables

[Lukasz Majewski <lukma at denx dot de>]

Hi Florian,

> This series cleans up various quirks in the Linux implementation
> related to historic lack of system call numbers in several places.

I'm wondering if those "system call tables" are generated from headers
from contemporary Linux (e.g. 5.5) or the oldest supported by glibc
(3.2)?

Moreover, I thought that the

#ifdef __NR_foo_syscall__ define was to prevent from mismatch between
newest glibc build with old linux kernel headers and running under yet
another kernel.

Is there any documentation regarding this new "approach"/"feature" with
those "system call tables"?

(I'm asking as I'm a bit puzzled).

Thanks in advance for explanation.

> 
> It has been tested on aarch64-linux-gnu, i686-linux-gnu,
> powerpc64le-linux-gnu, s390x-linux-gnu, x86_64-linux-gnu, and also
> built with build-many-glibcs-py.
> 
> I did not touch the futex #ifdefs because they are going to change
> soon enough.
> 
> Thanks,
> Florian
> 
> Florian Weimer (26):
>   Linux: Enhance glibcsyscalls.h to support listing system calls
>   Linux: renameat2 syscall number is always available
>   Linux: copy_file_range syscall number is always available
>   Linux: mlock2 syscall number is always available
>   Linux: mq_* syscall numbers are always available
>   Linux: statx syscall number is always available
>   Linux: sched_setaffinity syscall number is always available
>   Linux: sched_getaffinity syscall number is always available
>   Linux: sigaltstack syscall number is always available
>   Linux: Clean up pread64/pwrite64 system call names
>   Linux: Clean up preadv2, pwritev2 system call names
>   Linux: Clean up preadv, pwritev system call names
>   Linux: getrandom syscall number is always available
>   Linux: rt_sigqueueinfo syscall number is always available
>   Linux: pkey_mprotect syscall number is always available
>   Linux: set_tid_address syscall number is always available
>   Linux: exit_group syscall number is always available
>   Linux: getdents64 syscall number is always available on MIPS
>   Linux: pciconfig_iobase syscall number is always available on alpha
>   Linux: set_robust_list syscall number is always available
>   Linux: open_by_handle_at syscall number is always available
>   ia64: Do not define __NR_semtimedop in <sysdep.h>
>   x86_64: Do not define __NR_semtimedop in <sysdep.h>
>   Linux: epoll_pwait syscall number is always available
>   m68k: getpagesize syscall number is always available
>   microblaze: vfork is always available
> 
>  nptl/nptl-init.c                              |  4 -
>  nptl/pthread_create.c                         |  6 +-
>  sysdeps/nptl/fork.c                           | 10 +--
>  sysdeps/unix/sysv/linux/_exit.c               |  2 -
>  sysdeps/unix/sysv/linux/aio_sigqueue.c        |  5 --
>  sysdeps/unix/sysv/linux/alpha/ioperm.c        |  2 -
>  sysdeps/unix/sysv/linux/copy_file_range.c     |  5 --
>  sysdeps/unix/sysv/linux/epoll_pwait.c         | 16 ----
>  sysdeps/unix/sysv/linux/gai_sigqueue.c        |  5 --
>  sysdeps/unix/sysv/linux/generic/sysdep.h      |  8 --
>  sysdeps/unix/sysv/linux/getentropy.c          |  9 --
>  sysdeps/unix/sysv/linux/getrandom.c           | 13 ---
>  sysdeps/unix/sysv/linux/glibcsyscalls.py      | 86
> ++++++++++++++++++- sysdeps/unix/sysv/linux/ia64/sysdep.h         |
> 6 -- sysdeps/unix/sysv/linux/m68k/getpagesize.c    |  4 -
>  sysdeps/unix/sysv/linux/microblaze/vfork.S    |  4 -
>  .../unix/sysv/linux/mips/mips64/getdents64.c  |  2 -
>  sysdeps/unix/sysv/linux/mlock2.c              |  2 -
>  sysdeps/unix/sysv/linux/mq_close.c            |  6 --
>  sysdeps/unix/sysv/linux/mq_getattr.c          |  6 --
>  sysdeps/unix/sysv/linux/mq_notify.c           |  6 --
>  sysdeps/unix/sysv/linux/mq_open.c             |  5 --
>  sysdeps/unix/sysv/linux/mq_receive.c          |  6 --
>  sysdeps/unix/sysv/linux/mq_send.c             |  6 --
>  sysdeps/unix/sysv/linux/mq_unlink.c           |  6 --
>  sysdeps/unix/sysv/linux/nscd_setup_thread.c   |  2 -
>  sysdeps/unix/sysv/linux/open_by_handle_at.c   |  9 --
>  sysdeps/unix/sysv/linux/pkey_mprotect.c       |  5 --
>  sysdeps/unix/sysv/linux/pread.c               |  6 +-
>  sysdeps/unix/sysv/linux/pread64.c             |  4 -
>  sysdeps/unix/sysv/linux/pread64_nocancel.c    |  4 -
>  sysdeps/unix/sysv/linux/preadv.c              |  6 --
>  sysdeps/unix/sysv/linux/preadv2.c             |  7 +-
>  sysdeps/unix/sysv/linux/preadv64.c            | 10 +--
>  sysdeps/unix/sysv/linux/preadv64v2.c          |  9 +-
>  sysdeps/unix/sysv/linux/pwrite.c              |  6 +-
>  sysdeps/unix/sysv/linux/pwrite64.c            |  4 -
>  sysdeps/unix/sysv/linux/pwritev.c             |  6 --
>  sysdeps/unix/sysv/linux/pwritev2.c            |  4 +-
>  sysdeps/unix/sysv/linux/pwritev64.c           | 10 +--
>  sysdeps/unix/sysv/linux/pwritev64v2.c         |  9 +-
>  sysdeps/unix/sysv/linux/renameat2.c           |  7 +-
>  sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h | 11 ---
>  sysdeps/unix/sysv/linux/sched_getaffinity.c   | 10 +--
>  sysdeps/unix/sysv/linux/sched_setaffinity.c   |  7 +-
>  sysdeps/unix/sysv/linux/sigstack.c            |  4 -
>  sysdeps/unix/sysv/linux/statx.c               | 11 +--
>  sysdeps/unix/sysv/linux/x86_64/sysdep.h       |  7 --
>  48 files changed, 115 insertions(+), 273 deletions(-)
> 




Best regards,

Lukasz Majewski

--

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