Re: [PATCH v16 07/16] mm, arm64: untag user pointers in get_vaddr_frames

From: Catalin Marinas
Date: Mon Jun 10 2019 - 10:34:09 EST

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@xxxxxxxxxx>

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