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Date:   Mon, 10 Jun 2019 15:29:34 +0100
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Andrey Konovalov <andreyknvl@google.com>
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Subject: Re: [PATCH v16 07/16] mm, arm64: untag user pointers in
 get_vaddr_frames
Message-ID: <20190610142933.GC10165@c02tf0j2hf1t.cambridge.arm.com>
References: <cover.1559580831.git.andreyknvl@google.com>
 <da1d0e0f6d69c15a12987379e372182f416cbc02.1559580831.git.andreyknvl@google.com>
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On Mon, Jun 03, 2019 at 06:55:09PM +0200, Andrey Konovalov wrote:
> This patch is a part of a series that extends arm64 kernel ABI to allow to
> pass tagged user pointers (with the top byte set to something else other
> than 0x00) as syscall arguments.
> 
> get_vaddr_frames uses provided user pointers for vma lookups, which can
> only by done with untagged pointers. Instead of locating and changing
> all callers of this function, perform untagging in it.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>