linux-kernel - Re: [PATCH] Revert "mm/cma: manage the memory of the CMA area by using the ZONE

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Date:   Wed, 23 May 2018 09:09:04 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Laura Abbott <labbott@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Tony Lindgren <tony@...mide.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Laura Abbott <lauraa@...eaurora.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Nazarewicz <mina86@...a86.com>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "mm/cma: manage the memory of the CMA area by
 using the ZONE_MOVABLE"

2018-05-23 9:02 GMT+09:00 Andrew Morton <akpm@...ux-foundation.org>:
> On Mon, 21 May 2018 15:16:33 +0900 Joonsoo Kim <js1304@...il.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?

Yes. Reverting seems to be a right decision at this moment.
Could you apply original revert patch from Ville?

Thanks.