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Doug Moore b0056b31e9 libkern: add ilog2 macro 
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
2024-06-03 11:37:55 -05:00
..
booke_machdep.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
locore.S sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
machdep_e500.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
mp_cpudep.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
platform_bare.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
pmap.c libkern: add ilog2 macro 2024-06-03 11:37:55 -05:00
pmap_32.c libkern: add ilog2 macro 2024-06-03 11:37:55 -05:00
pmap_64.c libkern: add ilog2 macro 2024-06-03 11:37:55 -05:00
spe.c sys: Automated cleanup of cdefs and other formatting 2023-11-26 22:24:00 -07:00
trap_subr.S sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00