[SCM] GNU Mach branch, master, updated. v1.8-662-gbdcafee4

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit bdcafee412ab6eec58f6b315e16e57fe3dad002f
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Wed Jul 5 17:16:37 2023 +0300

    vm: Make vm_object_coalesce return new object and offset
    
    vm_object_coalesce() callers used to rely on the fact that it always
    merged the next_object into prev_object, potentially destroying
    next_object and leaving prev_object the result of the whole operation.
    
    After ee65849bec5da261be90f565bee096abb4117bdd
    "vm: Allow coalescing null object with an internal object", this is no
    longer true, since in case of prev_object == VM_OBJECT_NULL and
    next_object != VM_OBJECT_NULL, the overall result is next_object, not
    prev_object. The current callers are prepared to deal with this since
    they handle this case seprately anyway, but the following commit will
    introduce another caller that handles both cases in the same code path.
    
    So, declare the way vm_object_coalesce() coalesces the two objects its
    implementation detail, and make it return the resulting object and the
    offset into it explicitly. This simplifies the callers, too.
    Message-Id: <20230705141639.85792-2-bugaevc@gmail.com>

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

Summary of changes:
 vm/vm_map.c    | 11 ++++++-----
 vm/vm_object.c | 53 ++++++++++++++++++++++++++++++++++++++++-------------
 vm/vm_object.h |  4 +++-
 3 files changed, 49 insertions(+), 19 deletions(-)


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