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Date:   Tue, 22 May 2018 17:02:57 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Joonsoo Kim <js1304@gmail.com>
Cc:     Ville =?ISO-8859-1?Q?Syrj=E4l=E4?= 
        <ville.syrjala@linux.intel.com>, Laura Abbott <labbott@redhat.com>,
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        "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
        Tony Lindgren <tony@atomide.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Laura Abbott <lauraa@codeaurora.org>,
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        Michal Nazarewicz <mina86@mina86.com>,
        Minchan Kim <minchan@kernel.org>,
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        Russell King <linux@armlinux.org.uk>,
        Will Deacon <will.deacon@arm.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Revert
 "mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE"
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On Mon, 21 May 2018 15:16:33 +0900 Joonsoo Kim <js1304@gmail.com> wrote:

> > (gdb) list *(dma_direct_alloc+0x22f)
> > 0x573fbf is in dma_direct_alloc (../lib/dma-direct.c:104).
> > 94	
> > 95		if (!page)
> > 96			return NULL;
> > 97		ret = page_address(page);
> > 98		if (force_dma_unencrypted()) {
> > 99			set_memory_decrypted((unsigned long)ret, 1 << page_order);
> > 100			*dma_handle = __phys_to_dma(dev, page_to_phys(page));
> > 101		} else {
> > 102			*dma_handle = phys_to_dma(dev, page_to_phys(page));
> > 103		}
> > 104		memset(ret, 0, size);
> > 105		return ret;
> > 106	}
> > 
> 
> Okay. I find the reason about this error.

It's getting rather late and we don't seem to have a final set of fixes
yet.  Perhaps the best approach here is to revert and try again for
4.18?