On 5/28/20 9:16 PM, Valdis Klētnieks wrote: > commit 9088b449814f788d24f35a5840b6b2c2a23cd32a > Author: Paul E. McKenney <paulmck@xxxxxxxxxx> > Date: Mon May 25 17:22:24 2020 -0700 > > refperf: Provide module parameter to specify number of experiments > > changes this line of code (line 389) > > - reader_tasks[exp].result_avg = 1000 * process_durations(exp) / ((exp + 1) * loops); > + result_avg[exp] = 1000 * process_durations(nreaders) / (nreaders * loops); > > On a 32-bit ARM make allmodconfig with gcc 8.3, this results in: > > ERROR: modpost: "__aeabi_uldivmod" [kernel/rcu/refperf.ko] undefined! > make[1]: *** [scripts/Makefile.modpost:103: __modpost] Error 1 > > I admit not understanding why the original line of code worked and the new one doesn't. > Maybe gcc is smarter/dumber about the ranges of 'exp' and 'nreaders' than we thought? > Paul has already responded: (unfortunately) "So I am restricting to 64BIT for the time being. Yeah, I know, lazy of me. ;-)" https://lore.kernel.org/lkml/20200528180855.GP2869@paulmck-ThinkPad-P72/ -- ~Randy
