linux-kernel - Re: frv build failure in mainline kernel

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Message-ID: <18190.1494950672@warthog.procyon.org.uk>
Date:   Tue, 16 May 2017 17:04:32 +0100
From:   David Howells <dhowells@...hat.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     dhowells@...hat.com, Matthias Kaehlcke <mka@...omium.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: frv build failure in mainline kernel

Guenter Roeck <linux@...ck-us.net> wrote:

> Turns out not here because ____cacheline_aligned_in_smp includes
> __page_aligned_data which also declares the section, at least on x86.

If there's any sort of section specification, that should suffice, I think.
The problem might come that jiffies and jiffies_64 don't coincide at the same
address because FRV is BE not LE.

It ought to be possible to make jiffies 64-bit on FRV since it has double-word
instructions that can load/store aligned 64-bit values atomically to/from a
register pair.  That might require some compiler magic, though.  I'll have to
try and work out if that's possible.

David