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Fix overflow checking.

Description

Fix overflow checking.

There are some other potential problems related to overflowing racct
counters; I'll revisit those later.

Submitted by: Pieter de Goeje (earlier version)
Reviewed by: emaste@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation

Details

Provenance
traszAuthored on
Parents
rS297863: Rename the 'M_B' macro in t4_regs.h to 'CXGBE_M_B'.
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