From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [PSEUDOPATCH] rename is_compat_task
Date: Mon, 7 Dec 2015 23:42:52 +0000
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Lutomirski <luto@amacapital.net>, Linus Torvalds <torvalds@linux-foundation.org>, X86 ML <x86@kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, linux-arch <linux-arch@vger.kernel.org>

On Tue, Dec 08, 2015 at 12:16:51AM +0100, Arnd Bergmann wrote:

> As far as I know, x86 is the special case here, on all other architectures,
> this actually checks the task, and it's impossible to call a system call
> of the other kind.

sparc uses
	ta 0x10
for 32bit syscalls and
	ta 0x6d
for 64bit ones.  And yes, the same process can call both just fine.