linux-kernel - Re: [PATCH RT] tty: serial: st-asc: Make the locking RT aware

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Date:   Tue, 21 Mar 2017 19:51:47 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
cc:     lionel.debieve@...com, linux-rt-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, bigeasy@...utronix.de,
        Patrice Chotard <patrice.chotard@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH RT] tty: serial: st-asc: Make the locking RT aware

On Tue, 21 Mar 2017, Steven Rostedt wrote:
> >  	/*
> >  	 * Disable interrupts so we don't get the IRQ line bouncing
> 
> I'm nervous about the above comment, which in full is:
> 
> 	/*
> 	 * Disable interrupts so we don't get the IRQ line bouncing
> 	 * up and down while interrupts are disabled.
> 	 */
> 
> I'm not sure if disabling interrupts helps on an SMP system. This patch
> does change what happens when port->sysrq is set. But I'm not sure we
> care.

It disables interrupts at the device level which obviously helps whether on
SMP or not.

Thanks,

	tglx