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Date: Thu, 16 Jul 2026 11:58:07 +0100
From: Sudeep Holla <sudeep.holla@kernel.org>
To: Yureka Lilian <yureka@cyberchaos.dev>
Cc: Jonathan Corbet <corbet@lwn.net>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] arch: arm64: add early_param idle=<wfi|yield|nop>
Message-ID: <20260716-generous-organic-skylark-b9dfb1@sudeepholla>
References: <20260711-arm64-idle-param-v2-1-0ab67652a435@cyberchaos.dev>
 <20260713-bulky-thistle-leopard-c66a18@sudeepholla>
 <5f1af8d0-ed73-4dac-9bd3-30f8e82d4b26@cyberchaos.dev>
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In-Reply-To: <5f1af8d0-ed73-4dac-9bd3-30f8e82d4b26@cyberchaos.dev>

On Wed, Jul 15, 2026 at 03:24:03PM +0200, Yureka Lilian wrote:
> On 7/13/26 11:57, Sudeep Holla wrote:

[...]

> > 
> > If WFI is replaced by NOP or YIELD, do we really need to save/restore
> > IRQ context used for pseudo-NMIs which may add some overhead ?
> 
> There are optimizations, even in the ARM64_IDLE_WFI case, which could be
> done here, such as checking that an interrupt actually occurred before
> continuing (and repeating the wfi/yield/nop until this is the case). I would
> prefer not to do these optimizations in this patch series, and leave it as
> future work, because I don't understand all the implications at this point.
> Is this acceptable for you?
> 

Sure, I am fine with that. Anyways it is left to the maintainers.

-- 
Regards,
Sudeep