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Message-ID: <548bfcba-4619-6a49-dc2f-40d921300ab4@huawei.com>
Date: Wed, 31 Jul 2024 17:25:10 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
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 2024/7/31 16:24, Russell King (Oracle) wrote:
> 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.
You're right, it's more elegant to use dynamic keys in assembly, let me
think about how to do it.
>
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