thread_do_softirq in 4.19

thread_do_softirq in 4.19

[Richard Cochran]

Dear list,

The function thread_do_softirq() is never used anywhere in
v4.19.135-rt60.

   git grep thread_do_softirq

   include/linux/interrupt.h:505:static inline void thread_do_softirq(void) { do_softirq(); }
   include/linux/interrupt.h:515:extern void thread_do_softirq(void);
   kernel/softirq.c:674:void thread_do_softirq(void)

Is it supposed to be called from somewhere, or is it simply dead code?

Thanks,
Richard

Re: thread_do_softirq in 4.19

[Sebastian Andrzej Siewior]

On 2021-01-08 06:43:14 [-0800], Richard Cochran wrote:
> Dear list,
Hello Richard,

> The function thread_do_softirq() is never used anywhere in
> v4.19.135-rt60.
> 
>    git grep thread_do_softirq
> 
>    include/linux/interrupt.h:505:static inline void thread_do_softirq(void) { do_softirq(); }
>    include/linux/interrupt.h:515:extern void thread_do_softirq(void);
>    kernel/softirq.c:674:void thread_do_softirq(void)
> 
> Is it supposed to be called from somewhere, or is it simply dead code?

Dead code. My guess is, that is around unused since the softirq rework
around v3.0/v3.2. I just looked at v3.6-RT and it was unused there, too.
It has been removed it in v5.2-rt1.

> Thanks,
> Richard

Sebastian