linux-kernel - Re: [PATCH v2] lockdep: add lockdep_cleanup_dead

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Date:   Sun, 29 Oct 2023 17:47:52 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH v2] lockdep: add lockdep_cleanup_dead_cpu()

On Sun, 2023-10-29 at 18:33 +0100, Thomas Gleixner wrote:
> On Sat, Oct 28 2023 at 20:24, David Woodhouse wrote:
> > @@ -24,12 +24,16 @@
> >    extern void lockdep_hardirqs_on_prepare(void);
> >    extern void lockdep_hardirqs_on(unsigned long ip);
> >    extern void lockdep_hardirqs_off(unsigned long ip);
> > +  extern void lockdep_cleanup_dead_cpu(unsigned int cpu,
> > +                                      struct task_struct *idle);
> 
> Lacks a forward declaration of 'struct task_struct'
> 

Apparently so; I thought that was fairly much ubiquitous. Was debating
spamming you with a v3 in the space of as many days, or perhaps
revisiting my decision to *pass* the idle task out of kernel/cpu.c.
 
We could always shift the declaration of idle_thread_get() out to
linux/smpboot.h and let the lockdep code call it directly. You already
reviewed my patch to do that, although it was dropped in the end.

https://lore.kernel.org/lkml/20230321194008.785922-2-usama.arif@bytedance.com/

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