"irq/matrix: Spread interrupts on allocation" breaks nouveau in mainline kernel

[Lyude Paul]

Hi! Sorry to be the bearer of bad news, but this patch actually seems to break
suspending and resuming with nouveau on my machine:

[   29.694755] PM: suspend entry (deep)
[   29.694773] PM: Syncing filesystems ... done.
[   29.696203] Freezing user space processes ... (elapsed 0.001 seconds) done.
[   29.697442] OOM killer disabled.
[   29.697448] Freezing remaining freezable tasks ... (elapsed 0.000 seconds)
done.
[   29.698232] Suspending console(s) (use no_console_suspend to debug)
[   29.698993] serial 00:05: disabled
[   29.708227] sd 4:0:0:0: [sda] Synchronizing SCSI cache
[   29.708428] sd 4:0:0:0: [sda] Stopping disk
[   30.614581] ACPI: Preparing to enter system sleep state S3
[   30.917726] PM: Saving platform NVS memory
[   30.917736] Disabling non-boot CPUs ...
[   30.925616] smpboot: CPU 1 is now offline
[   30.936915] smpboot: CPU 2 is now offline
[   30.952824] smpboot: CPU 3 is now offline
[   30.964764] smpboot: CPU 4 is now offline
[   30.980663] smpboot: CPU 5 is now offline
[   30.992692] smpboot: CPU 6 is now offline
[   31.002572] smpboot: CPU 7 is now offline
[   31.003130] ACPI: Low-level resume complete
[   31.003180] PM: Restoring platform NVS memory
[   31.003578] WARNING: CPU: 0 PID: 11523 at kernel/smp.c:291
smp_call_function_single+0xdc/0xe0
[   31.003578] Modules linked in: nouveau video mxm_wmi i2c_algo_bit ttm
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm vfat fat usbhid
crc32_pclmul i2c_piix4 i2c_core shpchp k10temp wmi acpi_cpufreq crc32c_intel
r8169 mii xhci_pci xhci_hcd w83627hf_wdt
[   31.003590] CPU: 0 PID: 11523 Comm: rtcwake Not tainted 4.15.0-rc8nouveau-
clockgating+ #1
[   31.003591] Hardware name: MSI MS-7A39/A320M GAMING PRO (MS-7A39), BIOS 1.60
09/19/2017
[   31.003592] RIP: 0010:smp_call_function_single+0xdc/0xe0
[   31.003593] RSP: 0018:ffffc900004a3c40 EFLAGS: 00010046
[   31.003594] RAX: 0000000000000000 RBX: ffffc900004a3cdc RCX: 0000000000000001
[   31.003594] RDX: ffffc900004a3c98 RSI: ffffffff8137a180 RDI: 0000000000000000
[   31.003595] RBP: ffffc900004a3c70 R08: 0000000000000001 R09: 0000000000010000
[   31.003595] R10: ffffc900004a3c98 R11: 0000000000000000 R12: 0000000000000000
[   31.003596] R13: 0000000001000000 R14: ffffc900004a3d0c R15: 0000000000000000
[   31.003597] FS:  00007f03bee93540(0000) GS:ffff88021ae00000(0000)
knlGS:0000000000000000
[   31.003597] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.003598] CR2: 00007fffb6673008 CR3: 000000020ddd4000 CR4: 00000000003406f0
[   31.003598] Call Trace:
[   31.003603]  ? rdmsr_safe_on_cpu+0x4b/0x70
[   31.003604]  rdmsr_safe_on_cpu+0x4b/0x70
[   31.003606]  get_block_address.isra.0+0x6e/0xe0
[   31.003607]  mce_amd_feature_init+0x63/0x2c0
[   31.003609]  mce_syscore_resume+0x1e/0x30
[   31.003611]  syscore_resume+0x4b/0x170
[   31.003613]  suspend_devices_and_enter+0x608/0x7e0
[   31.003614]  pm_suspend+0x315/0x380
[   31.003615]  state_store+0x7d/0xe0
[   31.003618]  kernfs_fop_write+0xfa/0x180
[   31.003620]  __vfs_write+0x23/0x130
[   31.003623]  ? SYSC_newfstat+0x29/0x40
[   31.003625]  ? _cond_resched+0x15/0x40
[   31.003626]  vfs_write+0xad/0x1a0
[   31.003627]  SyS_write+0x42/0x90
[   31.003629]  entry_SYSCALL_64_fastpath+0x24/0x87
[   31.003630] RIP: 0033:0x7f03be9ae8f4
[   31.003631] RSP: 002b:00007ffe6bf825f8 EFLAGS: 00000246
[   31.003632] Code: fe ff ff 8b 55 e8 83 e2 01 74 0a f3 90 8b 55 e8 83 e2 01 75
f6 48 83 c4 28 41 5a 5d 49 8d 62 f8 c3 8b 05 58 b6 48 01 85 c0 75 86 <0f> ff eb
82 0f 1f 44 00 00 f6 46 18 01 75 15 c7 46 18 01 00 00 
[   31.003648] ---[ end trace 19fa2f7781ed5237 ]---
[   31.004025] Enabling non-boot CPUs ...
[   31.004052] x86: Booting SMP configuration:
[   31.004052] smpboot: Booting Node 0 Processor 1 APIC 0x1
[   31.006368]  cache: parent cpu1 should not be sleeping
[   31.006442] microcode: CPU1: patch_level=0x08001129
[   31.006509] CPU1 is up
[   31.006525] smpboot: Booting Node 0 Processor 2 APIC 0x2
[   31.008832]  cache: parent cpu2 should not be sleeping
[   31.008894] microcode: CPU2: patch_level=0x08001129
[   31.008966] CPU2 is up
[   31.008975] smpboot: Booting Node 0 Processor 3 APIC 0x3
[   31.011264]  cache: parent cpu3 should not be sleeping
[   31.011329] microcode: CPU3: patch_level=0x08001129
[   31.011404] CPU3 is up
[   31.011413] smpboot: Booting Node 0 Processor 4 APIC 0x8
[   31.013833]  cache: parent cpu4 should not be sleeping
[   31.013903] microcode: CPU4: patch_level=0x08001129
[   31.014025] CPU4 is up
[   31.014036] smpboot: Booting Node 0 Processor 5 APIC 0x9
[   31.016354]  cache: parent cpu5 should not be sleeping
[   31.016421] microcode: CPU5: patch_level=0x08001129
[   31.016534] CPU5 is up
[   31.016544] smpboot: Booting Node 0 Processor 6 APIC 0xa
[   31.018857]  cache: parent cpu6 should not be sleeping
[   31.018930] microcode: CPU6: patch_level=0x08001129
[   31.019047] CPU6 is up
[   31.019057] smpboot: Booting Node 0 Processor 7 APIC 0xb
[   31.021376]  cache: parent cpu7 should not be sleeping
[   31.021444] microcode: CPU7: patch_level=0x08001129
[   31.021579] CPU7 is up
[   31.022166] ACPI: Waking up from system sleep state S3
[   31.070791] usb usb1: root hub lost power or was reset
[   31.070794] usb usb2: root hub lost power or was reset
[   31.071628] serial 00:05: activated
[   31.080265] sd 4:0:0:0: [sda] Starting disk
[   31.126099] hpet_rtc_timer_reinit: 68 callbacks suppressed
[   31.126099] hpet1: lost 2 rtc interrupts
[   31.160913] r8169 0000:1e:00.0 enp30s0: link down
[   31.255563] do_IRQ: 1.35 No irq handler for vector
[   31.379537] ata6: SATA link down (SStatus 0 SControl 300)
[   31.379558] ata1: SATA link down (SStatus 0 SControl 300)
[   31.380306] ata2: SATA link down (SStatus 0 SControl 300)
[   31.435705] ata9: SATA link down (SStatus 0 SControl 300)
[   31.589932] ata5: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[   31.590320] ata5.00: configured for UDMA/133
[   31.610043] usb 1-4: reset low-speed USB device number 2 using xhci_hcd
[   32.226138] usb 1-5: reset low-speed USB device number 3 using xhci_hcd
[   33.257867] nouveau 0000:22:00.0: DRM: EVO timeout
[   34.237185] r8169 0000:1e:00.0 enp30s0: link up
[   35.257880] nouveau 0000:22:00.0: DRM: base-0: timeout
[   37.258334] nouveau 0000:22:00.0: DRM: base-0: timeout
[   37.276084] OOM killer enabled.
[   37.276612] Restarting tasks ... done.
[   37.277722] PM: suspend exit

I haven't yet actually investigated why it does this, but a bisect of master led
me to here.