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The kernel source contains several definitions of an ilog2 function; some are slower than necessary, and one of them is incorrect. Elimininate them all and define an ilog2 macro in libkern to replace them, in a way that is fast, correct for all argument types, and, in a GENERIC kernel, includes a check for an invalid zero parameter. Folks at Microsoft have verified that having a correct ilog2 definition for their MANA driver doesn't break it. Reviewed by: alc, markj, mhorne (older version), jhibbits (older version) Differential Revision: https://reviews.freebsd.org/D45170 Differential Revision: https://reviews.freebsd.org/D45235 |
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