[3.15-rc1] a huge number of warnings produced by xhci &

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Hi All,

I'm observing a huge number of warnings produced during the boot of my Keystone 2 board
when USB is enabled.

[    2.496460] BUG: using __this_cpu_read() in preemptible [00000000] code: khubd/202
[    2.504030] caller is __mod_zone_page_state+0x20/0xc8
[    2.509094] CPU: 1 PID: 202 Comm: khubd Not tainted 3.15.0-rc1-00015-ge521fa3-dirty #55
[    2.517122] [<c0013788>] (unwind_backtrace) from [<c001129c>] (show_stack+0x10/0x14)
[    2.524854] [<c001129c>] (show_stack) from [<c049f800>] (dump_stack+0x68/0xb8)
[    2.532086] [<c049f800>] (dump_stack) from [<c02731c0>] (check_preemption_disabled+0xe8/0x10c)
[    2.540708] [<c02731c0>] (check_preemption_disabled) from [<c00bc944>] (__mod_zone_page_state+0x20/0xc8)
[    2.550187] [<c00bc944>] (__mod_zone_page_state) from [<c00b50c8>] (reclaim_clean_pages_from_list+0x16c/0x178)
[    2.560193] [<c00b50c8>] (reclaim_clean_pages_from_list) from [<c00ac8f0>] (alloc_contig_range+0x10c/0x2d0)
[    2.569932] [<c00ac8f0>] (alloc_contig_range) from [<c02b0e58>] (dma_alloc_from_contiguous+0x70/0x118)
[    2.579241] [<c02b0e58>] (dma_alloc_from_contiguous) from [<c0017d24>] (__alloc_from_contiguous+0x34/0x160)
[    2.588974] [<c0017d24>] (__alloc_from_contiguous) from [<c0018760>] (__dma_alloc+0x18c/0x294)
[    2.597582] [<c0018760>] (__dma_alloc) from [<c00189f0>] (arm_dma_alloc+0xac/0xd8)
[    2.605140] [<c00189f0>] (arm_dma_alloc) from [<c00d84a8>] (dma_pool_alloc+0xc8/0x1b8)
[    2.613067] [<c00d84a8>] (dma_pool_alloc) from [<c0317120>] (xhci_alloc_container_ctx+0x70/0xe0)
[    2.621851] [<c0317120>] (xhci_alloc_container_ctx) from [<c03194e8>] (xhci_alloc_virt_device+0x98/0x220)
[    2.631418] [<c03194e8>] (xhci_alloc_virt_device) from [<c0315d28>] (xhci_alloc_dev+0x158/0x1f0)
[    2.640207] [<c0315d28>] (xhci_alloc_dev) from [<c02f6310>] (usb_alloc_dev+0x1d4/0x27c)
[    2.648217] [<c02f6310>] (usb_alloc_dev) from [<c02fb204>] (hub_thread+0x670/0x1204)
[    2.655943] [<c02fb204>] (hub_thread) from [<c003d8d8>] (kthread+0xcc/0xe8)
[    2.662906] [<c003d8d8>] (kthread) from [<c000e2f8>] (ret_from_fork+0x14/0x3c)

Anyone else sees the same thing?

Regards,
-grygorii
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