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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     Richard Cochran <richardcochran@gmail.com>
Cc:     linux-rt-users@vger.kernel.org
Subject: Re: thread_do_softirq in 4.19
Message-ID: <20210121154130.hlru3m3cw4sgb7ly@linutronix.de>
References: <20210108144314.GA23597@hoboy.vegasvil.org>
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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