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Date:   Mon, 12 Aug 2019 18:17:35 +0100
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Andrew Murray <andrew.murray@arm.com>
Cc:     Will Deacon <will@kernel.org>, linux-arch@vger.kernel.org,
        linux-doc@vger.kernel.org, Szabolcs Nagy <szabolcs.nagy@arm.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v7 1/2] arm64: Define
 Documentation/arm64/tagged-address-abi.rst
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On Mon, Aug 12, 2019 at 11:46:06AM +0100, Andrew Murray wrote:
> On Thu, Aug 08, 2019 at 06:04:24PM +0100, Will Deacon wrote:
> > On Wed, Aug 07, 2019 at 04:53:20PM +0100, Catalin Marinas wrote:
> > > +
> > > +- mmap() addr parameter.
> > > +
> > > +- mremap() new_address parameter.
> > > +
> > > +- prctl(PR_SET_MM, ``*``, ...) other than arg2 PR_SET_MM_MAP and
> > > +  PR_SET_MM_MAP_SIZE.
> > > +
> > > +- prctl(PR_SET_MM, PR_SET_MM_MAP{,_SIZE}, ...) struct prctl_mm_map fields.
> > 
> > How did you generate this list and who will keep it up to date? How do you
> > know you haven't missed anything?
> 
> What about shared memory system calls: shmat, shmdt? The latest "arm64: untag
> user pointers passed to the kernel" series doesn't untag these, thus we should
> indicate here that these too are no supported.

Yes. We dropped them from a previous version of the series but they've
never been documented. I'll add something (unless someone has a real
use-case for using tags with shmat/shmdt).

-- 
Catalin