5d4bf0578f
In Linux, ksize() gets the actual amount of memory allocated for a given object. This commit adds malloc_usable_size() to FreeBSD KPI which does the same. It also maps LinuxKPI ksize() to newly created function. ksize() function is used by drm-kmod. Reviewed by: hselasky, kib MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D26215