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From: Matthew Wilcox <willy@infradead.org>
To: David Laight <David.Laight@aculab.com>
Cc: "brouer@redhat.com" <brouer@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	 "linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>,
	"ilias.apalodimas@linaro.org" <ilias.apalodimas@linaro.org>,
	"mcroce@linux.microsoft.com" <mcroce@linux.microsoft.com>,
	"grygorii.strashko@ti.com" <grygorii.strashko@ti.com>,
	"arnd@kernel.org" <arnd@kernel.org>, "hch@lst.de" <hch@lst.de>,
	"linux-snps-arc@lists.infradead.org"
	<linux-snps-arc@lists.infradead.org>,
	"mhocko@kernel.org" <mhocko@kernel.org>,
	"mgorman@suse.de" <mgorman@suse.de>
Subject: Re: [PATCH 2/2] mm: Indicate pfmemalloc pages in compound_head
Date: Sat, 17 Apr 2021 22:28:43 +0100
Message-ID: <20210417212843.GT2531743@casper.infradead.org> (raw)
In-Reply-To: <2a531a42f23e4046833e0feb8faef0b5@AcuMS.aculab.com>

On Sat, Apr 17, 2021 at 09:13:45PM +0000, David Laight wrote:
> >  		struct {	/* page_pool used by netstack */
> > -			/**
> > -			 * @dma_addr: might require a 64-bit value on
> > -			 * 32-bit architectures.
> > -			 */
> > +			unsigned long pp_magic;
> > +			unsigned long xmi;
> > +			unsigned long _pp_mapping_pad;
> >  			unsigned long dma_addr[2];
> >  		};
> 
> You've deleted the comment.

Yes.  It no longer added any value.  You can see dma_addr now occupies
two words.

> I also think there should be a comment that dma_addr[0]
> must be aliased to ->index.

That's not a requirement.  Moving the pfmemalloc indicator is a
requirement so that we _can_ use index, but there's no requirement about
how index is used.

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Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 23:07 [PATCH 0/2] Change struct page layout for page_pool Matthew Wilcox (Oracle)
2021-04-16 23:07 ` [PATCH 1/2] mm: Fix struct page layout on 32-bit systems Matthew Wilcox (Oracle)
2021-04-17  1:08   ` kernel test robot
2021-04-17  2:45   ` Matthew Wilcox
2021-04-17 18:32     ` Ilias Apalodimas
2021-04-17 20:22       ` Matthew Wilcox
2021-04-18 11:21         ` Ilias Apalodimas
2021-04-17 21:18     ` David Laight
2021-04-17 22:45       ` Matthew Wilcox
2021-04-20  2:48     ` Vineet Gupta
2021-04-20  3:10       ` Matthew Wilcox
2021-04-20  7:07         ` Arnd Bergmann
2021-04-20 21:14           ` Vineet Gupta
2021-04-20 21:20             ` Arnd Bergmann
2021-04-21  5:50               ` hch
2021-04-21  8:43               ` David Laight
2021-04-21  8:58                 ` Arnd Bergmann
2021-04-20  7:39     ` Geert Uytterhoeven
2021-04-20  8:39       ` David Laight
2021-04-20 11:32       ` Matthew Wilcox
2021-04-17  7:34   ` Jesper Dangaard Brouer
2021-04-20  7:21   ` Rasmus Villemoes
2021-04-16 23:07 ` [PATCH 2/2] mm: Indicate pfmemalloc pages in compound_head Matthew Wilcox (Oracle)
2021-04-17 21:13   ` David Laight
2021-04-17 21:28     ` Matthew Wilcox [this message]
2021-04-20  4:03 ` [PATCH 0/2] Change struct page layout for page_pool Michael Ellerman

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