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

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To: Leonardo Bras <leobras@xxxxxxxxxx>, John Ogness <john.ogness@xxxxxxxxxxxxx>
Subject: Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
From: Jiri Slaby <jirislaby@xxxxxxxxxx>
Date: Thu, 18 Jan 2024 11:33:08 +0100
Cc: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Florian Fainelli <f.fainelli@xxxxxxxxx>, Tony Lindgren <tony@xxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-serial <linux-serial@xxxxxxxxxxxxxxx>
In-reply-to: <ZajxMc05uVmK7e60@LeoBras>
References: <20240116073701.2356171-1-leobras@redhat.com> <20240116073701.2356171-3-leobras@redhat.com> <75a39f0a-8f79-eacf-4a35-5de512a3cbed@linux.intel.com> <ZabJGefGkrs0SNzW@LeoBras> <87o7djaubq.fsf@jogness.linutronix.de> <ZajxMc05uVmK7e60@LeoBras>
User-agent: Mozilla Thunderbird

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?

--
js
suse labs

Follow-Ups:
- Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
  - From: Leonardo Bras

References:
- [RESEND RFC PATCH v1 0/2] Fix serial console for PREEMPT_RT
  - From: Leonardo Bras
- [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
  - From: Leonardo Bras
- Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
  - From: Ilpo Järvinen
- Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
  - From: Leonardo Bras
- Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
  - From: John Ogness
- Re: [RESEND RFC PATCH v1 2/2] serial/8250: Avoid getting lock in RT atomic context
  - From: Leonardo Bras

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