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ntb_hw: Add tunable to disable write-combining

Description

ntb_hw: Add tunable to disable write-combining

The tunable 'hw.ntb.enable_writecombine' may be set to zero to
administratively disable write combining the mapped NTB region.

Sponsored by: EMC / Isilon Storage Division

Details

Provenance
cemAuthored on
Parents
rS291029: NTB: Fix 32-bit BAR size validation
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