Quoting kernel test robot (2017-10-07 05:25:09)
> FYI, we noticed the following commit (built with gcc-6):
>
> commit: 202c1ca611488c621eed76cd63132a2c2838ee5f ("drm/i915: Move core GuC functions into dedicated file")
> url: https://github.com/0day-ci/linux/commits/Michal-Wajdeczko/drm-i915-Guc-code-reorg/20171002-205241
> base: git://anongit.freedesktop.org/drm-intel for-linux-next
>
> in testcase: aim9
> with following parameters:
>
> testtime: 300s
> test: exec_test
> cpufreq_governor: performance
>
> test-description: Suite IX is the "AIM Independent Resource Benchmark:" the famous synthetic benchmark.
> test-url: https://sourceforge.net/projects/aimbench/files/aim-suite9/
>
>
> on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 4G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +----------------+------------+------------+
> | | 6691933020 | 202c1ca611 |
> +----------------+------------+------------+
> | boot_successes | 3 | 4 |
> +----------------+------------+------------+
>
>
>
> kern :warn : [ 72.000033] WARNING: CPU: 0 PID: 179 at drivers/gpu/drm/i915/intel_uncore.c:1839 intel_uncore_forcewake_for_reg+0x1bb/0x250 [i915]
> kern :warn : [ 72.000037] Modules linked in: ppdev wmi_bmof kvm_intel(+) kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel snd_hda_intel i915(+) ahci(+) libahci ghash_clmulni_intel cryptd snd_hda_codec drm_kms_helper snd_hda_core syscopyarea sysfillrect snd_hwdep sysimgblt fb_sys_fops snd_pcm snd_timer libata snd soundcore pcspkr drm parport_pc shpchp wmi parport video ip_tables
> kern :warn : [ 72.000052] CPU: 0 PID: 179 Comm: systemd-udevd Not tainted 4.13.0-rc5-01377-g202c1ca #1
> kern :warn : [ 72.000052] Hardware name: Hewlett-Packard HP Pro 3340 MT/17A1, BIOS 8.07 01/24/2013
> kern :warn : [ 72.000053] task: ffff88011d7a8000 task.stack: ffffc90000b28000
> kern :warn : [ 72.000080] RIP: 0010:intel_uncore_forcewake_for_reg+0x1bb/0x250 [i915]
> kern :warn : [ 72.000080] RSP: 0018:ffffc90000b2ba78 EFLAGS: 00010296
> kern :warn : [ 72.000081] RAX: 0000000000000032 RBX: ffff88011b810000 RCX: 0000000000000000
> kern :warn : [ 72.000082] RDX: 0000000000000001 RSI: 0000000000000002 RDI: 0000000000000282
> kern :warn : [ 72.000083] RBP: ffffc90000b2baa0 R08: 0000000000000032 R09: ffffffff823555c0
> kern :warn : [ 72.000083] R10: 0000000000000010 R11: 0000000000000032 R12: 0000000000000001
> kern :warn : [ 72.000084] R13: 000000000000c180 R14: ffff88011b810000 R15: ffffffffa030f5e0
> kern :warn : [ 72.000085] FS: 00007f10e3fe68c0(0000) GS:ffff88011fa00000(0000) knlGS:0000000000000000
> kern :warn : [ 72.000086] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> kern :warn : [ 72.000086] CR2: 00007fe13fa89010 CR3: 000000011d7a4000 CR4: 00000000001406f0
> kern :warn : [ 72.000087] Call Trace:
> kern :warn : [ 72.000115] intel_guc_init_early+0x99/0xc0 [i915]
> kern :warn : [ 72.000141] intel_uc_init_early+0x15/0x20 [i915]
> kern :warn : [ 72.000163] i915_driver_load+0x2f2/0xe20 [i915]
Looks like you need intel_uncore_init() first, so
s/init_early/init_mmio/ ?
-Chris
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