linux-kernel - Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context

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Date: Thu, 18 Jan 2024 14:57:34 -0300
From: Leonardo Bras <leobras@...hat.com>
To: Jiri Slaby <jirislaby@...nel.org>
Cc: Leonardo Bras <leobras@...hat.com>,
	John Ogness <john.ogness@...utronix.de>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-serial <linux-serial@...r.kernel.org>
Subject: Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context

On Thu, Jan 18, 2024 at 11:33:08AM +0100, Jiri Slaby wrote:
> On 18. 01. 24, 10:36, Leonardo Bras wrote:
> > I am using mainline (torvalds/linux) kernel, forcing ARCH_SUPPORTS_RT:
> > 
> > diff --git a/arch/Kconfig b/arch/Kconfig
> > index 5ca66aad0d08..879c34398cb7 100644
> > --- a/arch/Kconfig
> > +++ b/arch/Kconfig
> > @@ -1195,7 +1195,7 @@ config ARCH_NO_PREEMPT
> >          bool
> >   config ARCH_SUPPORTS_RT
> > -       bool
> > +       def_bool y
> > 
> > Since I was not aware of a PREEMPT_RT-patched tree, I did this so I could
> > compile a PREEMPT_RT kernel.
> 
> Huh, when exactly did you intend to mention this?

Since I was not aware of an PREEMPT_RT-patched tree, I thought that this 
was the vanilla way to get a PREEMPT_RT kernel running. 

TBH I did not even though that there were an external repo for PREEMPT_RT. 
I mean, I knew about non-mainline patches in the past, but I thought 
everything got already merged upstream, and any other patches would be WIP.

I understand this was a mistake on my part, and I feel sorry if this 
brought any pain to reviewers. For the future, I will be basing my RT 
work in this RT-devel tree shared by John.

Thanks!
Leo

> 
> -- 
> js
> suse labs
>