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Let DDB's buf printer handle NULL pointers in the buf page array.

Description

Let DDB's buf printer handle NULL pointers in the buf page array.

A buf's b_pages and b_npages fields may be inconsistent after a panic.
For instance, vfs_vmio_invalidate() sets b_npages to zero only after all
pages are unwired and their page array entries are cleared.

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

Details

Provenance
markjAuthored on
Parents
rS302853: Finish removing the non-INTRNG support from sys/arm64.
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