[patch 14/19] softirq: Make softirq control and processing RT aware

[Frederic Weisbecker]

On Mon, Nov 23, 2020 at 08:27:33PM +0100, Thomas Gleixner wrote:
> On Mon, Nov 23 2020 at 14:44, Frederic Weisbecker wrote:
> > On Fri, Nov 13, 2020 at 03:02:21PM +0100, Thomas Gleixner wrote:
> >> +	/*
> >> +	 * Adjust softirq count to SOFTIRQ_OFFSET which makes
> >> +	 * in_serving_softirq() become true.
> >> +	 */
> >> +	cnt = SOFTIRQ_OFFSET;
> >> +	__local_bh_enable(cnt, false);
> >
> > But then you enter __do_softirq() with softirq_count() == SOFTIRQ_OFFSET.
> > __do_softirq() calls softirq_handle_begin() which then sets it back to
> > SOFTIRQ_DISABLE_OFFSET...
> 
> The RT variant of it added in this very same patch
> > +static inline void softirq_handle_begin(void) { }
> > +static inline void softirq_handle_end(void) { }

Oh missed that indeed, sorry!

> 
> Thanks,
> 
>         tglx