linux-kernel - Re: [PATCH] mm: Remove usages of ACCESS

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Date:	Tue, 24 Mar 2015 09:58:32 -0700
From:	Jason Low <jason.low2@...com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Christoph Lameter <cl@...ux.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Rik van Riel <riel@...hat.com>, jason.low2@...com
Subject: Re: [PATCH] mm: Remove usages of ACCESS_ONCE

On Tue, 2015-03-24 at 15:42 +0100, Christian Borntraeger wrote:
> Am 23.03.2015 um 23:44 schrieb Jason Low:
> > Commit 38c5ce936a08 converted ACCESS_ONCE usage in gup_pmd_range() to
> > READ_ONCE, since ACCESS_ONCE doesn't work reliably on non-scalar types.
> > 
> > This patch removes the rest of the usages of ACCESS_ONCE, and use
> > READ_ONCE for the read accesses. This also makes things cleaner,
> > instead of using separate/multiple sets of APIs.
> > 
> > Signed-off-by: Jason Low <jason.low2@...com>
> 
> Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>

Thanks.

> one remark or question:
> 
> > -	anon_mapping = (unsigned long) ACCESS_ONCE(page->mapping);
> > +	anon_mapping = (unsigned long)READ_ONCE(page->mapping);
> 
> Were the white space changes intentional? IIRC checkpatch does prefer
> it your way and you have changed several places - so I assume yes.

Yeah, those changes were intentional.

I thought that this was more of the standard style to do casting, so I
made those changes as well.

> Either way, its probably fine to change that along.

Okay, I'll assume that this is fine for now unless something thinks this
shouldn't be part of the patch.

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