linux-kernel - Re: ia64 exceptions (Re: [RFC][CFT][PATCHSET v1] uaccess unification)

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Date:   Wed, 5 Apr 2017 11:44:23 -0700
From:   Tony Luck <tony.luck@...il.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: ia64 exceptions (Re: [RFC][CFT][PATCHSET v1] uaccess unification)

On Wed, Apr 5, 2017 at 1:08 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> ... and sure enough, on generic kernel (CONFIG_ITANIUM) that yields a nice
> shiny oops at precisely that insn.

The right fix here might be to delete all the CONFIG_ITANIUM paths. I
doubt that anyone is still running upstream kernels on Merced CPUs
(and if they are, it might be a kindness to them to make them stop).

> We really need tests for uaccess primitives.  That's not a recent regression,
> BTW - it had been that way since 2.3.48-pre2, as far as I can see.

Probably be handy for new architectures to test all the corner cases.

-Tony