linux-kernel - Re: [PATCH] arm64/mm: remove unnecessary boundary check

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Message-ID: <20160226094718.GA29125@arm.com>
Date:	Fri, 26 Feb 2016 09:47:21 +0000
From:	Will Deacon <will.deacon@....com>
To:	miles.chen@...iatek.com
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	srv_wsdupstream@...iatek.com, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] arm64/mm: remove unnecessary boundary check

On Thu, Feb 25, 2016 at 11:44:34AM +0800, miles.chen@...iatek.com wrote:
> From: Miles Chen <miles.chen@...iatek.com>
> 
> Remove the unnecessary boundary check since there is a huge
> gap between user and kernel address that they would never overlap.
> (arm64 does not have enough levels of page tables to cover 64-bit
> virtual address)
> 
> See Documentation/arm64/memory.txt
> 
> Signed-off-by: Miles Chen <miles.chen@...iatek.com>
> ---
>  arch/arm64/mm/init.c | 2 --
>  1 file changed, 2 deletions(-)

Acked-by: Will Deacon <will.deacon@....com>

Will