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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][DRMTIP] igt@gem_userptr_blits@coherency-sync - dmesg-warn - WARNING: possible circular locking dependency detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110528#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CI][DRMTIP] igt@gem_userptr_blits@coherency-sync - dmesg-warn - WARNING: possible circular locking dependency detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110528">bug 110528</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>i915_vma_revoke_mmap() removes the user GGTT mmap and so should not callback
(and lock) via the userptr mmu-notifier. However, since we have used the same
lockclass, lockdep thinks it might. Quick and dirty fix, give userptr it's own
struct_mutex subclass. I whither at just the though of Tvrtko's scrutiny over
such a hack.</pre>
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