page alloc fail with fixed __GFP_ATOMIC flag

[  108.742541] kworker/u4:0: page allocation failure: order:0, mode:0x2284020
[  108.745932] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.4.8-devel-16.06.0-00509-gef5a8e4-dirty #612
[  108.750834] Hardware name: Marvell Armada 3720 Development Board DB-88F3720-DDR3 (DT)
[  108.754846] Workqueue: btrfs-submit btrfs_submit_helper
[  108.757588] Call trace:
[  108.758900] [<ffffffc000089710>] dump_backtrace+0x0/0x114
[  108.761598] [<ffffffc000089838>] show_stack+0x14/0x1c
[  108.764254] [<ffffffc0003d6e64>] dump_stack+0x90/0xb0
[  108.766776] [<ffffffc000148ecc>] warn_alloc_failed+0xe4/0x138
[  108.769791] [<ffffffc00014c5dc>] __alloc_pages_nodemask+0x6d8/0x83c
[  108.773032] [<ffffffc00018d5f4>] new_slab+0x330/0x3c4
[  108.775643] [<ffffffc00018fc9c>] ___slab_alloc.constprop.66+0x2c0/0x350
[  108.778973] [<ffffffc00018fd50>] __slab_alloc.isra.63.constprop.65+0x24/0x34
[  108.782843] [<ffffffc00018fef4>] kmem_cache_alloc+0x194/0x1c0
[  108.785819] [<ffffffc0004c1bd8>] scsi_host_alloc_command+0x30/0xb8
[  108.788974] [<ffffffc0004c2584>] scsi_get_command+0x24/0x160
[  108.791855] [<ffffffc0004c9144>] scsi_prep_fn+0x128/0x138
[  108.794647] [<ffffffc0003bb744>] blk_peek_request+0x150/0x204
[  108.797437] [<ffffffc0004c9ab0>] scsi_request_fn+0x4c/0x5ac
[  108.800497] [<ffffffc0003b7d24>] __blk_run_queue+0x34/0x4c
[  108.803423] [<ffffffc0003bbac8>] blk_flush_plug_list+0x1c0/0x228
[  108.806353] [<ffffffc0003bbddc>] blk_finish_plug+0x30/0x48
[  108.809368] [<ffffffc0003393d8>] run_scheduled_bios+0x240/0x448
[  108.812209] [<ffffffc0003395f0>] pending_bios_fn+0x10/0x18
[  108.815133] [<ffffffc000342dc8>] normal_work_helper+0x98/0x214
[  108.818284] [<ffffffc0003430d4>] btrfs_submit_helper+0x10/0x18
[  108.821125] [<ffffffc0000cbacc>] process_one_work+0x138/0x308
[  108.824229] [<ffffffc0000cbdd4>] worker_thread+0x138/0x438
[  108.827110] [<ffffffc0000d1778>] kthread+0xe0/0xf4
[  108.829454] [<ffffffc000085c50>] ret_from_fork+0x10/0x40
[  108.832244] Mem-Info:
[  108.833422] active_anon:3714 inactive_anon:33 isolated_anon:0
[  108.833422]  active_file:15869 inactive_file:77663 isolated_file:0
[  108.833422]  unevictable:0 dirty:2158 writeback:13097 unstable:0
[  108.833422]  slab_reclaimable:2004 slab_unreclaimable:2135
[  108.833422]  mapped:2020 shmem:70 pagetables:115 bounce:0
[  108.833422]  free:3443 free_pcp:214 free_cma:1211
[  108.850616] DMA free:13772kB min:2620kB low:3272kB high:3928kB active_anon:14856kB inactive_anon:132kB active_file:63476kB inactive_file:310652kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:524224kB managed:429488kB mlocked:0kB dirty:8632kB writeback:52388kB mapped:8080kB shmem:280kB slab_reclaimable:8016kB slab_unreclaimable:8540kB kernel_stack:2496kB pagetables:460kB unstable:0kB bounce:0kB free_pcp:856kB local_pcp:212kB free_cma:4844kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[  108.874139] lowmem_reserve[]: 0 0 0
[  108.875986] DMA: 87*4kB (MEH) 175*8kB (UMEHC) 406*16kB (MEH) 33*32kB (UMEHC) 2*64kB (HC) 6*128kB (C) 2*256kB (C) 2*512kB (C) 0*1024kB 1*2048kB (C) 0*4096kB = 13780kB
[  108.883565] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[  108.888062] 93614 total pagecache pages
[  108.889955] 0 pages in swap cache
[  108.891530] Swap cache stats: add 0, delete 0, find 0/0
[  108.894364] Free swap  = 0kB
[  108.895850] Total swap = 0kB
[  108.897426] 131056 pages RAM
[  108.898912] 0 pages HighMem/MovableOnly
[  108.900758] 23684 pages reserved
[  108.902378] 4096 pages cma reserved
[  108.904271] SLUB: Unable to allocate memory on node -1 (gfp=0x2088020)
[  108.907556]   cache: mnt_cache, object size: 384, buffer size: 384, default order: 1, min order: 0
[  108.912370]   node 0: slabs: 9, objs: 189, free: 0