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Step 4.2: start divorce of M_EXT and M_EXTPG

Description

Step 4.2: start divorce of M_EXT and M_EXTPG

They have more differencies than similarities. For now there is lots
of code that would check for M_EXT only and work correctly on M_EXTPG
buffers, so still carry M_EXT bit together with M_EXTPG. However,
prepare some code for explicit check for M_EXTPG.

Reviewed by: gallatin
Differential Revision: https://reviews.freebsd.org/D24598

Details

Provenance
glebiusAuthored on
Reviewer
gallatin
Differential Revision
D24598: More re-working of multipage mbufs.
Parents
rS360582: Mechanically rename MBUF_EXT_PGS_ASSERT() to M_ASSERTEXTPG() to match
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