linux-kernel - Re: [PATCH 0/6] arm64: alternatives runtime patching

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Message-ID: <2041011.PXfvHs4Xp7@wuerfel>
Date:	Fri, 14 Nov 2014 17:20:10 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Andre Przywara <andre.przywara@....com>, will.deacon@....com,
	catalin.marinas@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] arm64: alternatives runtime patching

On Friday 14 November 2014 15:54:06 Andre Przywara wrote:
> This series introduces alternatives runtime patching to arm64.
> This allows to patch assembly instruction at runtime to either
> fix hardware bugs or optimize for certain hardware features. Look
> at patch 5/6 for an example on how to use this.
> 

Does it provide a measurable performance benefit? The implementation
seems ok, but we should only add the complexity for things that
actually need it and can't be handled just as well with a run-time
conditional.

	Arnd
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