From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Jinjie Ruan <ruanjinjie@huawei.com>
Cc: arnd@arndb.de, afd@ti.com, akpm@linux-foundation.org,
linus.walleij@linaro.org, eric.devolder@oracle.com,
robh@kernel.org, vincent.whitchurch@axis.com, bhe@redhat.com,
nico@fluxnic.net, ardb@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH] ARM: support PREEMPT_DYNAMIC
Date: Wed, 31 Jul 2024 11:14:57 +0100 [thread overview]
Message-ID: <ZqoOoUPDIeJX5M0e@shell.armlinux.org.uk> (raw)
In-Reply-To: <034499ea-2cd6-8775-ee94-771cbecd4cdb@huawei.com>
On Wed, Jul 31, 2024 at 06:03:11PM +0800, Jinjie Ruan wrote:
> 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.
> It seems to be hard to use static keys in assembly code.
>
> By the way, currently, most architectures have simplified assembly code
> and implemented its most functions in C functions. Does arm32 have this
> plan?
arm32 is effectively in maintenance mode; very little active development
is occuring. So, there are no plans to change the code without good
reason (as code changes without reason will needlessly affect its
stability.)
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2024-07-31 10:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-20 9:00 [PATCH] ARM: support PREEMPT_DYNAMIC Jinjie Ruan
2024-07-31 2:07 ` Jinjie Ruan
2024-07-31 8:24 ` Russell King (Oracle)
2024-07-31 9:25 ` Jinjie Ruan
2024-07-31 10:03 ` Jinjie Ruan
2024-07-31 10:14 ` Russell King (Oracle) [this message]
2024-08-01 1:26 ` Jinjie Ruan
2024-08-23 15:56 ` Linus Walleij
2024-08-26 2:40 ` Jinjie Ruan
2024-08-02 11:44 ` Russell King (Oracle)
2024-08-05 2:00 ` Jinjie Ruan
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