On Tue, 2018-04-10 at 14:33 +0200, Peter Zijlstra wrote: > On Tue, Apr 10, 2018 at 10:00:01AM +0200, Rafael J. Wysocki wrote: > > On Tue, Apr 10, 2018 at 9:33 AM, <yuank...@codeaurora.org> wrote: > > > +++ b/kernel/time/tick-sched.h > > > @@ -48,8 +48,8 @@ struct tick_sched { > > > unsigned long check_clocks; > > > enum tick_nohz_mode nohz_mode; > > > > > > + bool tick_stopped : 1; > > > unsigned int inidle : 1; > > > - unsigned int tick_stopped : 1; > > > unsigned int idle_active : 1; > > > unsigned int do_timer_last : 1; > > > unsigned int got_idle_tick : 1; > > > > I don't think this is a good idea at all. > > > > Please see https://lkml.org/lkml/2017/11/21/384 for example. > > Joe, apw, could we get Checkpatch to whinge about _Bool in composite > types? That should immediately also disqualify using it as the base type > of bitfields.
Whinging about bool <foo> : <x> seems entirely sensible and straightforward to do. I'm not so sure about bool in structs as a patch context could be adding a bool to local stack definitions and there's no real ability to determine if the bool is in a struct or on the stack. Also, I think there's nothing really wrong with using bool in structs. Steven Rostedt's rationale in https://lkml.org/lkml/2017/11/21/207 isn't really right as sizeof(int) is 4 not 1 and sizeof(bool) is 1 on arches without alignment issues. I believe when using gcc, sizeof(bool) is always 1 and there may be alignment padding added on some arches. Dunno. But I think the battle is already lost anyway. git grep -P '(?<!static|extern)\s+bool\s+\w+\s*;' include | wc -l 1543