Subject: Re: [PATCH v2 00/44] cpuidle,rcu: Clean up the mess

From: Frederic Weisbecker <[email-masked]>
Date: Tue, 20 Sep 2022 14:31:45 +0200

On Mon, Sep 19, 2022 at 11:59:39AM +0200, Peter Zijlstra wrote:
> Hi All!
> 
> At long last, a respin of the cpuidle vs rcu cleanup patches.
> 
> v1: https://lkml.kernel.org/r/[email-masked]
> 
> These here patches clean up the mess that is cpuidle vs rcuidle.
> 
> At the end of the ride there's only on RCU_NONIDLE user left:
> 
>   arch/arm64/kernel/suspend.c:            RCU_NONIDLE(__cpu_suspend_exit());
> 
> and 'one' trace_*_rcuidle() user:
> 
>   kernel/trace/trace_preemptirq.c:                        trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
>   kernel/trace/trace_preemptirq.c:                        trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
>   kernel/trace/trace_preemptirq.c:                        trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
>   kernel/trace/trace_preemptirq.c:                        trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
>   kernel/trace/trace_preemptirq.c:                trace_preempt_enable_rcuidle(a0, a1);
>   kernel/trace/trace_preemptirq.c:                trace_preempt_disable_rcuidle(a0, a1);
> 
> However this last is all in deprecated code that should be unused for GENERIC_ENTRY.
> 
> I've touched a lot of code that I can't test and I might've broken something by
> accident. In particular the whole ARM cpuidle stuff was quite involved.
> 
> Please all; have a look where you haven't already.
> 
> 
> New since v1:
> 
>  - rebase on top of Frederic's rcu-context-tracking rename fest
>  - more omap goodness as per the last discusion (thanks Tony!)
>  - removed one more RCU_NONIDLE() from arm64/risc-v perf code
>  - ubsan/kasan fixes
>  - intel_idle module-param for testing
>  - a bunch of extra __always_inline, because compilers are silly.

Except for those I have already tagged as Reviewed:

Acked-by: Frederic Weisbecker <[email-masked]>

Thanks for the hard work!