linux-kernel - Re: [PATCH v2] acpi/ghes: Prevent sleeping with spinlock held

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Date: Wed, 14 Feb 2024 18:12:00 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: Ira Weiny <ira.weiny@...el.com>, "Rafael J. Wysocki" <rafael@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>, "Smita Koralahalli"
	<Smita.KoralahalliChannabasappa@....com>, <linux-acpi@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Dan Carpenter
	<dan.carpenter@...aro.org>, Masami Hiramatsu <mhiramat@...nel.org>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>,
	<linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] acpi/ghes: Prevent sleeping with spinlock held

On Wed, 14 Feb 2024 10:23:10 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 14 Feb 2024 12:11:53 +0000
> Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:
> 
> > So I'm thinking this is a won't fix - wait for the printk rework to land and
> > assume this will be resolved as well?  
> 
> That pretty much sums up what I was about to say ;-)
> 
> tp_printk is more of a hack and not to be used sparingly. With the right
> trace events it can hang the machine.
> 
> So, you can use your internal patch locally, but I would recommend waiting
> for the new printk changes to land. I'm really hoping that will be soon!
> 
> -- Steve

Thanks Steve,

Ira's fix is needed for other valid locking reasons - this was 'just another'
lock debugging report that came up whilst testing it.

For this patch (not a potential additional one that we aren't going to do ;)

Tested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>