From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/2] arm64: mm: treat memstart_addr as a signed quantity
Date: Mon, 29 Feb 2016 18:36:36 +0000 [thread overview]
Message-ID: <20160229183636.GF7935@e104818-lin.cambridge.arm.com> (raw)
In-Reply-To: <1456505834-8638-3-git-send-email-ard.biesheuvel@linaro.org>
On Fri, Feb 26, 2016 at 05:57:14PM +0100, Ard Biesheuvel wrote:
> Commit c031a4213c11 ("arm64: kaslr: randomize the linear region")
> implements randomization of the linear region, by subtracting a random
> multiple of PUD_SIZE from memstart_addr. This causes the virtual mapping
> of system RAM to move upwards in the linear region, and at the same time
> causes memstart_addr to assume a value which may be negative if the offset
> of system RAM in the physical space is smaller than its offset relative to
> PAGE_OFFSET in the virtual space.
>
> Since memstart_addr is effectively an offset now, redefine its type as s64
> so that expressions involving shifting or division preserve its sign.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Applied. Thanks.
--
Catalin
prev parent reply other threads:[~2016-02-29 18:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 16:57 [PATCH v2 0/2] vmemmap fix for bug introduced by extending VA range Ard Biesheuvel
2016-02-26 16:57 ` [PATCH v2 1/2] arm64: vmemmap: use virtual projection of linear region Ard Biesheuvel
2016-03-08 1:07 ` David Daney
2016-03-08 2:15 ` Ard Biesheuvel
2016-03-08 10:31 ` Ard Biesheuvel
2016-03-08 13:17 ` Mark Langsdorf
2016-03-08 15:21 ` Ard Biesheuvel
2016-03-09 11:32 ` Robert Richter
2016-03-09 11:36 ` Robert Richter
2016-02-26 16:57 ` [PATCH v2 2/2] arm64: mm: treat memstart_addr as a signed quantity Ard Biesheuvel
2016-02-29 12:39 ` Ard Biesheuvel
2016-02-29 18:36 ` Catalin Marinas [this message]
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