Re: ✗ Fi.CI.IGT: failure for drm/i915: Use seqlock in engine stats (rev2)

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Quoting Patchwork (2018-02-15 23:50:52)
> == Series Details ==
> 
> Series: drm/i915: Use seqlock in engine stats (rev2)
> URL   : https://patchwork.freedesktop.org/series/38347/
> State : failure
> 
> == Summary ==
> 
> Test perf_pmu:
>         Subgroup busy-start-vcs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup busy-idle-check-all-vecs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup render-node-busy-idle-vcs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup most-busy-idle-check-all-bcs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup busy-idle-check-all-bcs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup most-busy-check-all-bcs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup render-node-busy-bcs0:
>                 pass       -> DMESG-WARN (shard-apl)
>         Subgroup busy-idle-vecs0:
>                 pass       -> DMESG-WARN (shard-apl)

Afaict, it's complaining that because the writer is special the reader
needs irq protection. Which I don't understand, as the point is that the
writer can run concurrently to the readers (the readers have to
restart). What am I missing?
-Chris
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