FYI, we noticed the below dmesg warning changes on

git://linuxtv.org/snawrocki/samsung.git next-20140721-exynos4412-odroid-sound
commit c2b6ef437792d4d5f972d5147b809aac78a5b273 ("drm/i915: set pm._irqs_disabled at IRQ init time")

test case: lkp-t410/boot/1
lkp-t410 is a Westmere laptop.

e59a094c9058421  c2b6ef437792d4d5f972d5147 
---------------  ------------------------- 
         0           +Inf%          1 ± 0%  TOTAL dmesg.WARNING:CPU:PID:at_drivers/gpu/drm/i915/i915_irq.c:ironlake_enable_display_irq_i915()
         0           +Inf%          1 ± 0%  TOTAL dmesg.WARNING:CPU:PID:at_drivers/gpu/drm/i915/i915_irq.c:ibx_display_interrupt_update_i915()
         1 ± 0%    -100.0%          0 ± 0%  TOTAL dmesg.WARNING:CPU:PID:at_drivers/gpu/drm/i915/intel_pm.c:intel_disable_gt_powersave_i915()

After patch, the dmesg sometimes show this warning

[    9.146723] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    9.146724] [drm] Driver supports precise vblank timestamp query.
[    9.147237] ------------[ cut here ]------------
[    9.147300] WARNING: CPU: 0 PID: 271 at drivers/gpu/drm/i915/i915_irq.c:139 ironlake_enable_display_irq+0x73/0x80 [i915]()
[    9.147336] Modules linked in: snd_hda_codec_conexant snd_hda_codec_generic mxm_wmi i915(+) snd_hda_intel snd_hda_controller video parport_pc thinkpad_acpi snd_hda_codec sdhci_pci rfkill snd_hwdep parport drm_kms_helper uvcvideo sdhci videobuf2_vmalloc videobuf2_memops mmc_core videobuf2_core firewire_ohci pcspkr snd_pcm v4l2_common ahci firewire_core libahci videodev intel_ips i2c_i801 snd_timer drm crc_itu_t snd libata wmi soundcore acpi_cpufreq
[    9.147340] CPU: 0 PID: 271 Comm: modprobe Not tainted 3.16.0-rc4-00052-gc2b6ef4 #1
[    9.147342] Hardware name: LENOVO 25222AU/25222AU, BIOS 6IET52WW (1.12 ) 02/16/2010
[    9.147347]  0000000000000009 ffff880076b0f8e0 ffffffff8182b6d0 0000000000000000
[    9.147350]  ffff880076b0f918 ffffffff8106d0dd ffff880074f30000 ffff880074f37128
[    9.147354]  0000000000000246 ffff880074f30000 ffff880074f30000 ffff880076b0f928
[    9.147355] Call Trace:
[    9.147365]  [<ffffffff8182b6d0>] dump_stack+0x4d/0x66
[    9.147373]  [<ffffffff8106d0dd>] warn_slowpath_common+0x7d/0xa0
[    9.147376]  [<ffffffff8106d1ba>] warn_slowpath_null+0x1a/0x20
[    9.147421]  [<ffffffffa02a88b3>] ironlake_enable_display_irq+0x73/0x80 [i915]
[    9.147466]  [<ffffffffa02a912f>] ironlake_irq_postinstall+0x17f/0x1a0 [i915]
[    9.147488]  [<ffffffffa00957be>] drm_irq_install+0xbe/0x1a0 [drm]
[    9.147547]  [<ffffffffa03067e7>] i915_driver_load+0xb07/0xfe0 [i915]
[    9.147555]  [<ffffffff813de338>] ? kobject_uevent_env+0x178/0x690
[    9.147560]  [<ffffffff814df1e7>] ? get_device+0x17/0x30
[    9.147564]  [<ffffffff814e4875>] ? klist_class_dev_get+0x15/0x20
[    9.147569]  [<ffffffff8181943a>] ? klist_add_tail+0x3a/0x40
[    9.147572]  [<ffffffff814e0919>] ? device_add+0x1f9/0x610
[    9.147595]  [<ffffffffa009c176>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
[    9.147614]  [<ffffffffa009878d>] drm_dev_register+0xad/0x100 [drm]
[    9.147634]  [<ffffffffa009b26f>] drm_get_pci_dev+0x8f/0x1f0 [drm]
[    9.147668]  [<ffffffffa027856b>] i915_pci_probe+0x3b/0x60 [i915]
[    9.147674]  [<ffffffff81412c25>] local_pci_probe+0x45/0xa0
[    9.147679]  [<ffffffff81413db5>] ? pci_match_device+0xe5/0x110
[    9.147683]  [<ffffffff81413ef1>] pci_device_probe+0xd1/0x130
[    9.147688]  [<ffffffff814e39b0>] driver_probe_device+0x90/0x3c0
[    9.147691]  [<ffffffff814e3db3>] __driver_attach+0x93/0xa0
[    9.147694]  [<ffffffff814e3d20>] ? __device_attach+0x40/0x40
[    9.147697]  [<ffffffff814e1a33>] bus_for_each_dev+0x63/0xa0
[    9.147700]  [<ffffffff814e344e>] driver_attach+0x1e/0x20
[    9.147704]  [<ffffffff814e3060>] bus_add_driver+0x180/0x250
[    9.147707]  [<ffffffff814e4584>] driver_register+0x64/0xf0
[    9.147712]  [<ffffffff814125bc>] __pci_register_driver+0x4c/0x50
[    9.147731]  [<ffffffffa009b4da>] drm_pci_init+0x10a/0x140 [drm]
[    9.147736]  [<ffffffffa035d000>] ? 0xffffffffa035cfff
[    9.147771]  [<ffffffffa035d089>] i915_init+0x89/0x90 [i915]
[    9.147779]  [<ffffffff8100212c>] do_one_initcall+0xbc/0x1f0
[    9.147784]  [<ffffffff811a9c35>] ? kfree+0x125/0x160
[    9.147789]  [<ffffffff8118fea2>] ? __vunmap+0xb2/0x100
[    9.147797]  [<ffffffff810ec9bc>] load_module+0x15fc/0x1a30
[    9.147801]  [<ffffffff810e8550>] ? store_uevent+0x40/0x40
[    9.147805]  [<ffffffff8119025c>] ? __vmalloc_node_range+0xbc/0x270
[    9.147810]  [<ffffffff810eceb1>] SyS_init_module+0xc1/0x110
[    9.147817]  [<ffffffff81834529>] system_call_fastpath+0x16/0x1b
[    9.147820] ---[ end trace 2d05078fac923b98 ]---
[    9.147880] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem

Thanks,
Fengguang
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