linux-kernel - Re: [PATCH] ARM: support PREEMPT

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Message-ID: <Zqn0wL5iScf455O5@shell.armlinux.org.uk>
Date: Wed, 31 Jul 2024 09:24:32 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: arnd@...db.de, afd@...com, akpm@...ux-foundation.org,
	linus.walleij@...aro.org, eric.devolder@...cle.com, robh@...nel.org,
	vincent.whitchurch@...s.com, bhe@...hat.com, nico@...xnic.net,
	ardb@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] ARM: support PREEMPT_DYNAMIC

On Wed, Jul 31, 2024 at 10:07:53AM +0800, Jinjie Ruan wrote:
> >  #ifdef CONFIG_PREEMPTION
> > +#ifdef CONFIG_PREEMPT_DYNAMIC
> > +	bl	need_irq_preemption
> > +	cmp	r0, #0
> > +	beq	2f
> > +#endif

Depending on the interrupt rate, this can be regarded as a fast path,
it would be nice if we could find a way to use static branches in
assembly code.

-- 
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