Jan Kiszka wrote: > Gilles Chanteperdrix wrote: >> Author: gch >> Date: Sun Nov 16 03:30:40 2008 >> New Revision: 4392 >> >> URL: http://svn.gna.org/viewcvs/xenomai?rev=4392&view=rev >> Log: >> Implement nodiv_ullimd on x86_64 >> >> Modified: >> trunk/include/asm-x86/arith_64.h > > Nice. This solves the user-triggerable kernel oops due to idiv overflows > in the original version (rt_task_sleep_until(1LL<<63);). I happened to > receive such a bug report on Friday and was about to consider > alternative solutions beyond limit checks. > > But how accurate is this conversion? I mean how many bits can we lose > when doing xnarch_ns_to_tsc(xnarch_tsc_to_ns(x))?
Thanks to a little addition, nodiv_ullimd has the same precision as ullimd. > > Final question: Already prepared a 32-bit version? :) Yes, the generic vercion should work, provided we implement __rthal_add96and64 which does an addl and two adcl -- Gilles. _______________________________________________ Xenomai-core mailing list Xenomaifirstname.lastname@example.org https://mail.gna.org/listinfo/xenomai-core