lin_tape module are requesting continuous pages, causing page allocation failure.

Issue

• A page allocation failure occurs and the following message is output.

[13610297.631375] dsmserv: page allocation failure: order:6, mode:0xd0
[13610297.631385] CPU: 4 PID: 26915 Comm: dsmserv Kdump: loaded Tainted: P        W  OE  ------------   3.10.0-1160.el7.x86_64 #1
[13610297.631388] Hardware name: Lenovo ThinkSystem SR650 -[7X06CTO1WW]-/-[7X06CTO1WW]-, BIOS -[IVE122G-1.31]- 08/15/2018
[13610297.631391] Call Trace:
[13610297.631406]  [<ffffffffb7f81340>] dump_stack+0x19/0x1b
[13610297.631413]  [<ffffffffb79c4780>] warn_alloc_failed+0x110/0x180
[13610297.631419]  [<ffffffffb7f7c85d>] __alloc_pages_slowpath+0x6bb/0x729
[13610297.631426]  [<ffffffffb79c8d76>] __alloc_pages_nodemask+0x436/0x450
[13610297.631435]  [<ffffffffb7a189d8>] alloc_pages_current+0x98/0x110
[13610297.631439]  [<ffffffffb79c347e>] __get_free_pages+0xe/0x40
[13610297.631455]  [<ffffffffc0b3dd8d>] tape_init_op_sg+0xdd/0x3f0 [lin_tape]
[13610297.631465]  [<ffffffffc0b3e13b>] tape_build_op_sg+0x9b/0x140 [lin_tape]
[13610297.631473]  [<ffffffffc0b3e215>] setup_sg_for_ops+0x35/0x220 [lin_tape]
[13610297.631484]  [<ffffffffc0b49cce>] erp_read_buffer+0x57e/0x6f0 [lin_tape]
[13610297.631494]  [<ffffffffc0b4fabf>] tape_send_erp_cmd+0xdf/0x340 [lin_tape]
[13610297.631503]  [<ffffffffc0b4ff4e>] read_dump+0x2e/0x100 [lin_tape]
[13610297.631511]  [<ffffffffc0b50110>] tape_check_simmim_dump_logsense+0x50/0x70 [lin_tape]
[13610297.631519]  [<ffffffffc0b50ccf>] tape_send_scsi_cmd+0xef/0x2c0 [lin_tape]
[13610297.631529]  [<ffffffffc0b59559>] persistent_reserve_in+0x159/0x340 [lin_tape]
[13610297.631537]  [<ffffffffc0b597c8>] tape_read_reservation+0x88/0x1d0 [lin_tape]
[13610297.631545]  [<ffffffffc0b6968d>] lin_tape_tsm_query_pr_key+0x10d/0x220 [lin_tape]
[13610297.631556]  [<ffffffffc0b382d1>] lin_tape_drive_ioctl+0x1461/0x1bf0 [lin_tape]
[13610297.631565]  [<ffffffffc0b30670>] ? sioc_mode_sense_page+0xd0/0xd0 [lin_tape]
[13610297.631573]  [<ffffffffc0b2bbee>] lin_tape_ioctl_drive+0x14e/0x270 [lin_tape]
[13610297.631580]  [<ffffffffc0b2be95>] lin_tape_ioctl+0xa5/0x120 [lin_tape]
[13610297.631587]  [<ffffffffb7a632e0>] do_vfs_ioctl+0x3a0/0x5b0
[13610297.631593]  [<ffffffffb7a53aa4>] ? SYSC_newfstat+0x34/0x60
[13610297.631597]  [<ffffffffb7a63591>] SyS_ioctl+0xa1/0xc0
[13610297.631605]  [<ffffffffb7f93f92>] system_call_fastpath+0x25/0x2a
[13610297.631608] Mem-Info:
[13610297.631617] active_anon:1258386 inactive_anon:10521081 isolated_anon:0
 active_file:1488035 inactive_file:7966525 isolated_file:3
 unevictable:4258 dirty:14 writeback:0 unstable:0
 slab_reclaimable:347549 slab_unreclaimable:93611
 mapped:10794203 shmem:10778699 pagetables:42813 bounce:0
 free:91158 free_pcp:1046 free_cma:0
[13610297.631624] Node 0 DMA free:15700kB min:12kB low:12kB high:16kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15996kB managed:15904kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:96kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[13610297.631634] lowmem_reserve[]: 0 2503 47801 47801
[13610297.631638] Node 0 DMA32 free:190108kB min:2560kB low:3200kB high:3840kB active_anon:78464kB inactive_anon:243844kB active_file:179556kB inactive_file:1231284kB unevictable:8kB isolated(anon):0kB isolated(file):12kB present:2802196kB managed:2563852kB mlocked:8kB dirty:0kB writeback:0kB mapped:141400kB shmem:139976kB slab_reclaimable:611168kB slab_unreclaimable:22892kB kernel_stack:800kB pagetables:944kB unstable:0kB bounce:0kB free_pcp:676kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[13610297.631648] lowmem_reserve[]: 0 0 45298 45298
[13610297.631651] Node 0 Normal free:84752kB min:46332kB low:57912kB high:69496kB active_anon:2464476kB inactive_anon:24994016kB active_file:2805624kB inactive_file:13768396kB unevictable:748kB isolated(anon):0kB isolated(file):0kB present:47185920kB managed:46385164kB mlocked:748kB dirty:24kB writeback:0kB mapped:25773304kB shmem:25757360kB slab_reclaimable:354276kB slab_unreclaimable:174128kB kernel_stack:23344kB pagetables:90328kB unstable:0kB bounce:0kB free_pcp:872kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[13610297.631660] lowmem_reserve[]: 0 0 0 0
[13610297.631663] Node 1 Normal free:74072kB min:41200kB low:51500kB high:61800kB active_anon:2490604kB inactive_anon:16846464kB active_file:2966960kB inactive_file:16866420kB unevictable:16276kB isolated(anon):0kB isolated(file):0kB present:41943040kB managed:41252996kB mlocked:16276kB dirty:32kB writeback:0kB mapped:17262108kB shmem:17217460kB slab_reclaimable:424752kB slab_unreclaimable:177328kB kernel_stack:24848kB pagetables:79980kB unstable:0kB bounce:0kB free_pcp:2636kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[13610297.631671] lowmem_reserve[]: 0 0 0 0
[13610297.631675] Node 0 DMA: 1*4kB (U) 0*8kB 1*16kB (U) 0*32kB 1*64kB (U) 0*128kB 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15700kB
[13610297.631690] Node 0 DMA32: 266*4kB (UEM) 233*8kB (UEM) 462*16kB (UEM) 3784*32kB (UEM) 904*64kB (UEM) 7*128kB (UEM) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 190160kB
[13610297.631703] Node 0 Normal: 5949*4kB (UEM) 3128*8kB (UEM) 917*16kB (UEM) 368*32kB (UEM) 113*64kB (UEM) 16*128kB (M) 1*256kB (M) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 84804kB
[13610297.631717] Node 1 Normal: 4458*4kB (UM) 2277*8kB (UEM) 830*16kB (UEM) 371*32kB (UEM) 136*64kB (UEM) 32*128kB (M) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 74000kB
[13610297.631731] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[13610297.631734] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[13610297.631737] Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[13610297.631739] Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[13610297.631741] 20235032 total pagecache pages
[13610297.631748] 165 pages in swap cache
[13610297.631750] Swap cache stats: add 16301, delete 16136, find 808/2007
[13610297.631752] Free swap  = 16736932kB
[13610297.631754] Total swap = 16777212kB
[13610297.631756] 22986788 pages RAM
[13610297.631758] 0 pages HighMem/MovableOnly
[13610297.631759] 432309 pages reserved