[Bug tapsets/19905] New: preadv2/pwritev2 missing from syscall tapset

[Bug tapsets/19905] New: preadv2/pwritev2 missing from syscall tapset

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19905

            Bug ID: 19905
           Summary: preadv2/pwritev2 missing from syscall tapset
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

The preadv2/pwritev2 syscalls were added in kernel 4.6-rc1 by the following
kernel commit:

====
commit f17d8b35452cab31a70d224964cd583fb2845449
Author: Milosz Tanski <milosz@adfin.com>
Date:   Thu Mar 3 16:03:59 2016 +0100

    vfs: vfs: Define new syscalls preadv2,pwritev2

    New syscalls that take an flag argument.   No flags are added yet in this
    patch.
====

Support for these syscalls should be added to the syscall tapset.

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[Bug tapsets/19905] preadv2/pwritev2 missing from syscall tapset

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19905

David Smith <dsmith at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|systemtap at sourceware dot org    |dsmith at redhat dot com

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
While working on this one, I've discovered a kernel bug - the syscalls were
wired up incorrectly in the x86_64 syscall table. In compat mode, the syscalls
are still wired up to sys_preadv2/sys_pwritev2 instead of
compat_sys_preadv2/compat_sys_pwritev2.

I've sent email to Christoph Hellwig, the author of the patch that added the
syscalls to the x86_64 syscall table. He's agreed that it doesn't look right,
and we're working through the problem.

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