On Mon, 2015-01-19 at 16:29 +0000, Julien Grall wrote: > + unsigned int order; > + > if ( dabt.size != DABT_WORD ) goto bad_width; > /* No secure world support for guests. */ > *r = (((v->domain->max_vcpus << 5) & GICD_TYPE_CPUS ) | > ((v->domain->arch.vgic.nr_lines / 32) & GICD_TYPE_LINES)); > + > + /* > + * Calculate number of interrupt identifier bits supported by > + * the GIC Stream Protocol Interface > + */ > + irqs--; > + for ( order = 0; irqs; order++ ) > + irqs >>= 1;
This is some variant on fls(). See get_bitmask_order() or get_count_order() for an example of use, possibly even one you could call. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
