Btrfs: Avoid using __GFP_HIGHMEM with slab allocator
btrfs_releasepage may call kmem_cache_alloc indirectly,
and provide same GFP flags it gets to kmem_cache_alloc.
So it's possible to use __GFP_HIGHMEM with the slab
allocator.
Signed-off-by: NYan Zheng <zheng.yan@oracle.com>
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