linux-kernel - Re: [RT,1/1] tty/serial/sifive: Make the locking RT aware

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Message-ID: <20241203103611._nfkyEXJ@linutronix.de>
Date: Tue, 3 Dec 2024 11:36:11 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: ende.tan@...rfivetech.com
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, rostedt@...dmis.org,
	linux-rt-users@...r.kernel.org, leyfoon.tan@...rfivetech.com,
	endeneer@...il.com
Subject: Re: [RT,1/1] tty/serial/sifive: Make the locking RT aware

On 2024-12-03 17:40:09 [+0800], ende.tan@...rfivetech.com wrote:
> From: Tan En De <ende.tan@...rfivetech.com>
> 
> The lock is a sleeping lock and local_irq_save() is not the optimsation
> we are looking for. Redo it to make it work on -RT and non-RT.

You need to state which kernel this needs to be applied to.
The change you looking for is
	32c694ec3efc2 ("serial: sifive: Use uart_prepare_sysrq_char() to handle sysrq.")

> Signed-off-by: Tan En De <ende.tan@...rfivetech.com>
> Signed-off-by: Tan Ley Foon <leyfoon.tan@...rfivetech.com>

Sebastian