linux-kernel - Re: [PATCH v4 07/11] mm/gup: use a standard migration target allocation callback

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Date:   Wed, 8 Jul 2020 16:21:33 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Hellwig <hch@...radead.org>,
        Roman Gushchin <guro@...com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [PATCH v4 07/11] mm/gup: use a standard migration target
 allocation callback

On Tue, Jul 07, 2020 at 01:46:14PM +0200, Michal Hocko wrote:
> On Tue 07-07-20 16:44:45, Joonsoo Kim wrote:
> [...]
> > @@ -1551,9 +1552,12 @@ struct page *alloc_migration_target(struct page *page, unsigned long private)
> >  
> >  		gfp_mask |= htlb_alloc_mask(h);
> >  		return alloc_huge_page_nodemask(h, nid, mtc->nmask,
> > -						gfp_mask, false);
> > +						gfp_mask, mtc->skip_cma);
> >  	}
> >  
> > +	if (mtc->skip_cma)
> > +		flags = memalloc_nocma_save();
> > +
> 
> As already mentioned in previous email this is a completely wrong usage
> of the scope API. The scope should be defined by the caller and this
> should be all transparent by the allocator layer.

Okay. Like as newly sent patch for 04/11, this patch will also be changed.

Thanks.