XFS WARN_ON in xfs_vm_writepage

[Dave Jones]

Just hit this on Linus' tree from earlier this afternoon..

WARNING: CPU: 3 PID: 19721 at fs/xfs/xfs_aops.c:971 xfs_vm_writepage+0x5ce/0x630 [xfs]()
CPU: 3 PID: 19721 Comm: trinity-c61 Not tainted 3.15.0+ #3
 0000000000000009 000000004f70ab82 ffff8801d5ebf578 ffffffff8373215c
 0000000000000000 ffff8801d5ebf5b0 ffffffff8306f7cd ffff88023dd543e0
 ffffea000254a3c0 ffff8801d5ebf820 ffffea000254a3e0 ffff8801d5ebf728
Call Trace:
 [<ffffffff8373215c>] dump_stack+0x4e/0x7a
 [<ffffffff8306f7cd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8306f8fa>] warn_slowpath_null+0x1a/0x20
 [<ffffffffc023068e>] xfs_vm_writepage+0x5ce/0x630 [xfs]
 [<ffffffff8373f1ab>] ? preempt_count_sub+0xab/0x100
 [<ffffffff83347315>] ? __percpu_counter_add+0x85/0xc0
 [<ffffffff8316f759>] shrink_page_list+0x8f9/0xb90
 [<ffffffff83170123>] shrink_inactive_list+0x253/0x510
 [<ffffffff83170c93>] shrink_lruvec+0x563/0x6c0
 [<ffffffff83170e2b>] shrink_zone+0x3b/0x100
 [<ffffffff831710e1>] shrink_zones+0x1f1/0x3c0
 [<ffffffff83171414>] try_to_free_pages+0x164/0x380
 [<ffffffff83163e52>] __alloc_pages_nodemask+0x822/0xc90
 [<ffffffff83169eb2>] ? pagevec_lru_move_fn+0x122/0x140
 [<ffffffff831abeff>] alloc_pages_vma+0xaf/0x1c0
 [<ffffffff8318a931>] handle_mm_fault+0xa31/0xc50
 [<ffffffff831845c0>] ? follow_page_mask+0x1f0/0x320
 [<ffffffff8318491b>] __get_user_pages+0x22b/0x660
 [<ffffffff831b5093>] ? kmem_cache_alloc+0x183/0x210
 [<ffffffff8318ce7e>] __mlock_vma_pages_range+0x9e/0xd0
 [<ffffffff8318d6ba>] __mm_populate+0xca/0x180
 [<ffffffff83179033>] vm_mmap_pgoff+0xd3/0xe0
 [<ffffffff8318fbd6>] SyS_mmap_pgoff+0x116/0x2c0
 [<ffffffff83011ced>] ? syscall_trace_enter+0x14d/0x2a0
 [<ffffffff830084c2>] SyS_mmap+0x22/0x30
 [<ffffffff837436ef>] tracesys+0xdd/0xe2


 970         if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
 971                         PF_MEMALLOC))

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