[SCM] GNU Mach branch, master, updated. v1.8-880-g661835c9

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 661835c91d14a41755c5f340ba0257c6ca8db1a1
Author: Flavio Cruz <flaviocruz@gmail.com>
Date:   Mon Feb 19 23:58:00 2024 -0500

    x86_64: avoid iterating over the message twice in copyoutmsg/copyinmsg for 
faster RPCs.
    
    This is a follow up to
    
https://git.savannah.gnu.org/cgit/hurd/gnumach.git/commit/?id=69620634858b2992e1a362e33c95d9a8ee57bce7
    where we made inlined ports 8 bytes long to avoid resizing.
    
    The last thing that copy{in,out}msg were doing was just updating
    msgt_size field since that's required for kernel stub code and implicitly
    assumed by IPC code. This was moved into ipc_kmsg_copy{in,out}_body.
    
    For a 32 bit userland, the code also stops updating
    msgt_size for out of line ports, same as the 64 bit userland.
    Message-ID: <ZdQxWNSieTHcpM1b@jupiter.tail36e24.ts.net>

-----------------------------------------------------------------------

Summary of changes:
 i386/i386/locore.h |   6 +++
 ipc/copy_user.c    | 123 ++++++++++-------------------------------------------
 ipc/ipc_kmsg.c     |  52 +++++++++++++++-------
 3 files changed, 66 insertions(+), 115 deletions(-)


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