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From: Steve Capper <Steve.Capper@arm.com>
Subject: Re: [PATCH V4 6/6] arm64: mm: Allow forcing all userspace addresses
 to 52-bit
Date: Thu, 6 Dec 2018 12:28:07 +0000
Message-ID: <20181206122758.GB17572@capper-debian.cambridge.arm.com>
References: <20181205164145.24568-1-steve.capper@arm.com>
 <20181205164145.24568-7-steve.capper@arm.com>
 <20181206115132.GD54495@arrakis.emea.arm.com>
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To: Catalin Marinas <Catalin.Marinas@arm.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Will Deacon <Will.Deacon@arm.com>, "jcm@redhat.com" <jcm@redhat.com>, "ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>, nd <nd@arm.com>

On Thu, Dec 06, 2018 at 11:51:33AM +0000, Catalin Marinas wrote:
> On Wed, Dec 05, 2018 at 04:41:45PM +0000, Steve Capper wrote:
> > On arm64 52-bit VAs are provided to userspace when a hint is supplied t=
o
> > mmap. This helps maintain compatibility with software that expects at
> > most 48-bit VAs to be returned.
> >=20
> > In order to help identify software that has 48-bit VA assumptions, this
> > patch allows one to compile a kernel where 52-bit VAs are returned by
> > default on HW that supports it.
> >=20
> > This feature is intended to be for development systems only.
> >=20
> > Signed-off-by: Steve Capper <steve.capper@arm.com>
>=20
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>

Thanks Catalin.