n Mon, 14 Apr 2014, Grygorii Strashko wrote: > 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? Either disable interrupts or use mod_zone_page_state instead. This should fix it: Subject: vmscan: reclaim_clean_pages_from_list must use mod_zone_page_state Seems to be called with preemption enabled. Therefore it must use mod_zone_page_state instead. Signed-off-by: Christoph Lameter <cl@xxxxxxxxx> Index: linux/mm/vmscan.c =================================================================== --- linux.orig/mm/vmscan.c 2014-04-09 11:35:43.917930976 -0500 +++ linux/mm/vmscan.c 2014-04-14 12:09:48.070745938 -0500 @@ -1158,7 +1158,7 @@ unsigned long reclaim_clean_pages_from_l TTU_UNMAP|TTU_IGNORE_ACCESS, &dummy1, &dummy2, &dummy3, &dummy4, &dummy5, true); list_splice(&clean_pages, page_list); - __mod_zone_page_state(zone, NR_ISOLATED_FILE, -ret); + mod_zone_page_state(zone, NR_ISOLATED_FILE, -ret); return ret; } -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
