MFC r260949:
Make comconsole options set before its activation to be remembered.
MFC: 261291

The timestamp bit is number 17, and not number 9, in the stat error
field of the receive descriptor.
MFC r261449:
Fix lock acquisition in case no request space available, missed in r260097.
MFC r244535, r245995, r261505 and r258961:
- Use a boundary of zero, hence a PAGE_SIZE boundary
is implied by all memory allocations.
- Fix an external compiler warning about write-only
assigned variable.