Re: [PATCH v2 0/9] preempt: Add a generic function to return the preemption string.

[Peter Zijlstra <peterz@infradead.org>]

On Mon, Feb 03, 2025 at 03:16:23PM +0100, Sebastian Andrzej Siewior wrote:
> The individual architectures often add the preemption model to the begin
> of the backtrace. This is the case on X86 or ARM64 for the "die" case
> but not for regular warning. With the addition of DYNAMIC_PREEMPT for
> PREEMPT_RT we end up with CONFIG_PREEMPT and CONFIG_PREEMPT_RT set
> simultaneously. That means that everyone who tried to add that piece of
> information gets it wrong for PREEMPT_RT because PREEMPT is checked
> first.
> 
> This series adds a generic helper which is used by
> dump_stack_print_info() and other architectures which don't use the
> function and provide this information on their own.
> 
> RFC…v2 https://lore.kernel.org/all/20241206113431.Q-VXMlru@linutronix.de/
>   - Split into individual patches.
>   - Implement preempt_model_str() based on feedback by Peter Zijlstra
>     and Steven Rostedt.
> 
> Sebastian
> 
> Sebastian Andrzej Siewior (9):
>   sched: Add a generic function to return the preemption string.
>   lib/dump_stack: Use preempt_model_str().
>   arm: Rely on generic printing of preemption model.
>   arm64: Rely on generic printing of preemption model.
>   powerpc: Use preempt_model_str().
>   s390: Rely on generic printing of preemption model.
>   x86: Rely on generic printing of preemption model.
>   xtensa: Use preempt_model_str().
>   tracing: Use preempt_model_str().

Works for me; how do we want to go about merging this?

I can take it through the sched tree I suppose, once the various arch
people have blessed it.