alc
be5201b0d1
Introduce vm_fault_hold() and use it to (1) eliminate a long-standing race ...
condition in proc_rwmem() and to (2) simplify the implementation of the
cxgb driver's vm_fault_hold_user_pages(). Specifically, in proc_rwmem()
the requested read or write could fail because the targeted page could be
reclaimed between the calls to vm_fault() and vm_page_hold().
In collaboration with: kib@
MFC after: 6 weeks
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be5201b0d1