I hit this warning in Linux 3.16rc2 booting, Not sure if this has been
fixed, hope it help!
[ 1.770683] [drm] DMA map mode: Using physical TTM page addresses.
[ 1.770788] [drm] Capabilities:
[ 1.770800] [drm] Rect copy.
[ 1.770802] [drm] Cursor.
[ 1.770804] [drm] Cursor bypass.
[ 1.770806] [drm] Cursor bypass 2.
[ 1.770809] [drm] 8bit emulation.
[ 1.770811] [drm] Alpha cursor.
[ 1.770814] [drm] Extended Fifo.
[ 1.770817] [drm] Multimon.
[ 1.770819] [drm] Pitchlock.
[ 1.770821] [drm] Irq mask.
[ 1.770823] [drm] Display Topology.
[ 1.770825] [drm] GMR.
[ 1.770827] [drm] Traces.
[ 1.770830] [drm] GMR2.
[ 1.770833] [drm] Screen Object 2.
[ 1.770836] [drm] Max GMR ids is 64
[ 1.770838] [drm] Max number of GMR pages is 65536
[ 1.770840] [drm] Max dedicated hypervisor surface memory is 163840 kiB
[ 1.770843] [drm] Maximum display memory size is 8192 kiB
[ 1.770845] [drm] VRAM at 0xd8000000 size is 8192 kiB
[ 1.770847] [drm] MMIO at 0xd0800000 size is 256 kiB
[ 1.770900] [drm] global init.
[ 1.771159] [TTM] Zone kernel: Available graphics memory: 3942698 kiB
[ 1.771163] [TTM] Zone dma32: Available graphics memory: 2097152 kiB
[ 1.771166] [TTM] Initializing pool allocator
[ 1.771193] [TTM] Initializing DMA pool allocator
[ 1.771660] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.771664] [drm] No driver support for vblank timestamp query.
[ 1.772220] ------------[ cut here ]------------
[ 1.772249] WARNING: CPU: 0 PID: 160 at drivers/gpu/drm/drm_modeset_lock.c:91 drm_modeset_drop_locks+0x71/0x80 [drm]()
[ 1.772252] Modules linked in: vmwgfx(+) sd_mod drm_kms_helper crc_t10dif crct10dif_common ttm drm ata_piix libata vmw_pvscsi i2c_core floppy
[ 1.772280] CPU: 0 PID: 160 Comm: systemd-udevd Not tainted 3.16.0-rc2+ #1
[ 1.772283] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 08/16/2013
[ 1.772286] 0000000000000000 00000000e25ff18d ffff880036a2b938 ffffffff8160f1af
[ 1.772295] 0000000000000000 ffff880036a2b970 ffffffff8105a44d ffff8800366fdb00
[ 1.772304] ffff880232942000 ffff8800366fdb00 ffff88022f521800 ffff880036580000
[ 1.772313] Call Trace:
[ 1.772322] [<ffffffff8160f1af>] dump_stack+0x4d/0x66
[ 1.772329] [<ffffffff8105a44d>] warn_slowpath_common+0x7d/0xa0
[ 1.772334] [<ffffffff8105a57a>] warn_slowpath_null+0x1a/0x20
[ 1.772344] [<ffffffffa0098941>] drm_modeset_drop_locks+0x71/0x80 [drm]
[ 1.772354] [<ffffffffa00896be>] drm_modeset_unlock_all+0x2e/0x70 [drm]
[ 1.772365] [<ffffffffa008b287>] drm_crtc_init_with_planes+0xa7/0x110 [drm]
[ 1.772372] [<ffffffffa00d4373>] drm_crtc_init+0x33/0xcc0 [drm_kms_helper]
[ 1.772382] [<ffffffffa0178a51>] vmw_kms_init_screen_object_display+0x1a1/0x260 [vmwgfx]
[ 1.772390] [<ffffffffa016b759>] vmw_kms_init+0x59/0x70 [vmwgfx]
[ 1.772399] [<ffffffffa016d88f>] vmw_driver_load+0x80f/0xd60 [vmwgfx]
[ 1.772408] [<ffffffffa008416d>] drm_dev_register+0xad/0x100 [drm]
[ 1.772418] [<ffffffffa0086e1f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[ 1.772427] [<ffffffffa016c6e5>] vmw_probe+0x15/0x20 [vmwgfx]
[ 1.772434] [<ffffffff81346c05>] local_pci_probe+0x45/0xa0
[ 1.772442] [<ffffffff81347db5>] ? pci_match_device+0xe5/0x110
[ 1.772449] [<ffffffff81347f19>] pci_device_probe+0xf9/0x150
[ 1.772460] [<ffffffff81405ab0>] driver_probe_device+0x90/0x3c0
[ 1.772466] [<ffffffff81405eb3>] __driver_attach+0x93/0xa0
[ 1.772471] [<ffffffff81405e20>] ? __device_attach+0x40/0x40
[ 1.772476] [<ffffffff81403903>] bus_for_each_dev+0x73/0xc0
[ 1.772481] [<ffffffff8140551e>] driver_attach+0x1e/0x20
[ 1.772486] [<ffffffff814050f8>] bus_add_driver+0x188/0x260
[ 1.772491] [<ffffffff81406994>] driver_register+0x64/0xf0
[ 1.772496] [<ffffffff81346590>] __pci_register_driver+0x60/0x70
[ 1.772506] [<ffffffffa008708a>] drm_pci_init+0x10a/0x140 [drm]
[ 1.772512] [<ffffffff810bc07d>] ? trace_hardirqs_on+0xd/0x10
[ 1.772517] [<ffffffffa0193000>] ? 0xffffffffa0192fff
[ 1.772525] [<ffffffffa0193018>] vmwgfx_init+0x18/0x1000 [vmwgfx]
[ 1.772533] [<ffffffff81000314>] do_one_initcall+0xd4/0x210
[ 1.772540] [<ffffffff811bb72c>] ? __vunmap+0xac/0x110
[ 1.772548] [<ffffffff810f741c>] load_module+0x13ec/0x1af0
[ 1.772553] [<ffffffff810f2630>] ? store_uevent+0x70/0x70
[ 1.772558] [<ffffffff810f3002>] ? copy_module_from_fd.isra.47+0x122/0x180
[ 1.772564] [<ffffffff810f7ce6>] SyS_finit_module+0xa6/0xd0
[ 1.772570] [<ffffffff81619512>] system_call_fastpath+0x16/0x1b
[ 1.772573] ---[ end trace 45128a916e166aef ]---
[ 1.773051] [drm] Screen objects system initialized
[ 1.773309] [drm] width 1280
[ 1.773329] [drm] height 768
[ 1.773339] [drm] bpp 32
[ 1.783940] [drm] Fifo max 0x00040000 min 0x00001000 cap 0x0000077f
[ 1.790916] fbcon: svgadrmfb (fb0) is primary device
[ 1.793255] Console: switching to colour frame buffer device 160x48
[ 1.794982] [drm] Initialized vmwgfx 2.6.0 20140325 for 0000:00:0f.0 on minor 0
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