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Date:   Mon, 17 Oct 2022 11:04:14 -0300
From:   "Guilherme G. Piccoli" <>
        Xiaoming Ni <>,
        Arjan van de Ven <>
        Cong Wang <>,
        Sebastian Andrzej Siewior <>,
        Valentin Schneider <>,
Subject: Re: [PATCH V3 07/11] notifiers: Add tracepoints to the notifiers

On 19/08/2022 19:17, Guilherme G. Piccoli wrote:
> Currently there is no way to show the callback names for registered,
> unregistered or executed notifiers. This is very useful for debug
> purposes, hence add this functionality here in the form of notifiers'
> tracepoints, one per operation.
> Cc: Arjan van de Ven <>
> Cc: Cong Wang <>
> Cc: Sebastian Andrzej Siewior <>
> Cc: Steven Rostedt <>
> Cc: Valentin Schneider <>
> Cc: Xiaoming Ni <>
> Signed-off-by: Guilherme G. Piccoli <>
> ---
> V3:
> - Yet another major change - thanks to Arjan's great suggestion,
> refactored the code to make use of tracepoints instead of guarding
> the output with a Kconfig debug setting.
> V2:
> - Major improvement thanks to the great idea from Xiaoming - changed
> all the ksym wheel reinvention to printk %ps modifier;
> - Instead of ifdefs, using IS_ENABLED() - thanks Steven.
> - Removed an unlikely() hint on debug path.

Hi Arjan / all, apologies for the re-ping.
Did you have a chance to take a look in this one, is there anything else
I could improve?

Thanks in advance,


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