[Intel-gfx] [PATCH] drm/i915: Mark vm_free_page() as a potential sleeper agent

[Chris Wilson]

Quoting Chris Wilson (2017-11-09 10:21:41)
> vm_free_page() may call down into set_pages_array_wb() (which itself
> sleeps, on x86 at least) but only if on !llc and the caches overflow.
> Since this is unlikely, we only rarely trigger the error in practice,
> and so to make CI detection of this sleeping bug possible we want to
> mark the common vm_free_page() as a potential sleep.
> 

References: https://bugs.freedesktop.org/show_bug.cgi?id=103638
> Suggested-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Matthew Auld <matthew.william.auld at gmail.com>

The real test ofc is whether this reports an error from CI.
-Chris