From our i386 counterpart: |revision 1.13 |date: 1995/09/15 23:49:23;  author: davidg;  state: Exp;  lines: +15 -2 |Check for page being resident when doing I/O with /dev/kmem and return |EFAULT if it is not resident. This prevents the system from manufacturing |a zero-fill page for unused but allocated areas of the kernel's VM.
From our i386 counterpart:
|revision 1.13
|date: 1995/09/15 23:49:23;  author: davidg;  state: Exp;  lines: +15 -2
|Check for page being resident when doing I/O with /dev/kmem and return
|EFAULT if it is not resident. This prevents the system from manufacturing
|a zero-fill page for unused but allocated areas of the kernel's VM.

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