linux-kernel - Re: [RESEND PATCH v2] devres: Really align data field to unsigned long long

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Date:   Mon, 9 Jul 2018 07:22:08 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "geert@...ux-m68k.org" <geert@...ux-m68k.org>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "Alexey.Brodkin@...opsys.com" <Alexey.Brodkin@...opsys.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "greg@...ah.com" <greg@...ah.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [RESEND PATCH v2] devres: Really align data field to unsigned
 long long

Hi Geert,

On Mon, 2018-07-09 at 09:07 +0200, Geert Uytterhoeven wrote:
> On Mon, Jul 9, 2018 at 7:49 AM Greg KH <greg@...ah.com> wrote:
> > On Mon, Jul 09, 2018 at 07:44:44AM +0300, Alexey Brodkin wrote:
> > > Depending on ABI "long long" type of a particular 32-bit CPU
> > > might be aligned by either word (32-bits) or double word (64-bits).
> 
> Or even 16-bit (on e.g. m68k).

Indeed, thanks for the note!
Will add this in my v3.

For ARC I'd like this fix to be back-ported starting
from v4.8 where we added support of "native" atomic64_t, see commit
ce6365270ecd (" ARCv2: Implement atomic64 based on LLOCKD/SCONDD instructions").

What about m68k, do you have any preference of earliest kernel version
where this fix might be useful?

-Alexey