linux-kernel - Re: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems

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Message-ID: <20210420031029.GI2531743@casper.infradead.org>
Date:   Tue, 20 Apr 2021 04:10:29 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     "brouer@...hat.com" <brouer@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
        "mcroce@...ux.microsoft.com" <mcroce@...ux.microsoft.com>,
        "grygorii.strashko@...com" <grygorii.strashko@...com>,
        "arnd@...nel.org" <arnd@...nel.org>, "hch@....de" <hch@....de>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "mgorman@...e.de" <mgorman@...e.de>
Subject: Re: [PATCH 1/2] mm: Fix struct page layout on 32-bit systems

On Tue, Apr 20, 2021 at 02:48:17AM +0000, Vineet Gupta wrote:
> > 32-bit architectures which expect 8-byte alignment for 8-byte integers
> > and need 64-bit DMA addresses (arc, arm, mips, ppc) had their struct
> > page inadvertently expanded in 2019.
> 
> FWIW, ARC doesn't require 8 byte alignment for 8 byte integers. This is 
> only needed for 8-byte atomics due to the requirements of LLOCKD/SCOND 
> instructions.

Ah, like x86?  OK, great, I'll drop your arch from the list of
affected.  Thanks!