linux-kernel - Re: [PATCH] arm: xen: mm: use __GPF_DMA32 for arm64

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Message-ID: <20190827094520.GJ13294@shell.armlinux.org.uk>
Date:   Tue, 27 Aug 2019 10:45:20 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Peng Fan <peng.fan@....com>
Cc:     "sstabellini@...nel.org" <sstabellini@...nel.org>,
        "julien.grall@....com" <julien.grall@....com>,
        "van.freenix@...il.com" <van.freenix@...il.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm: xen: mm: use __GPF_DMA32 for arm64

You need to find someone who is interested in Xen on 32-bit ARM, and
who knows this code - and therefore what impact your change causes.
That isn't me, sorry.

On Tue, Aug 27, 2019 at 09:27:53AM +0000, Peng Fan wrote:
> Ping again..
> 
> +Julien
> 
> > Subject: RE: [PATCH] arm: xen: mm: use __GPF_DMA32 for arm64
> > 
> > Hi Russell, Stefano
> > 
> > > Subject: [PATCH] arm: xen: mm: use __GPF_DMA32 for arm64
> > 
> > Any comments?
> > 
> > >
> > > arm64 shares some code under arch/arm/xen, including mm.c.
> > > However ZONE_DMA is removed by commit
> > > ad67f5a6545("arm64: replace ZONE_DMA with ZONE_DMA32").
> > > So to ARM64, need use __GFP_DMA32.
> > >
> > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > ---
> > >  arch/arm/xen/mm.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c index
> > > e1d44b903dfc..a95e76d18bf9 100644
> > > --- a/arch/arm/xen/mm.c
> > > +++ b/arch/arm/xen/mm.c
> > > @@ -27,7 +27,7 @@ unsigned long xen_get_swiotlb_free_pages(unsigned
> > int
> > > order)
> > >
> > >  	for_each_memblock(memory, reg) {
> > >  		if (reg->base < (phys_addr_t)0xffffffff) {
> > > -			flags |= __GFP_DMA;
> > > +			flags |= __GFP_DMA | __GFP_DMA32;
> > >  			break;
> > >  		}
> > >  	}
> > 
> > Thanks,
> > Peng.
> 
> Thanks,
> Peng.
> 
> > 
> > > --
> > > 2.16.4
> 
> 
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
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> 

-- 
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