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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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dbd6ef29a7
The bottom-half we use for processing the breadcrumb interrupt is a task, which is an RCU protected struct. When accessing this struct, we need to be holding the RCU read lock to prevent it disappearing beneath us. We can use the RCU annotation to mark our irq_seqno_bh pointer as being under RCU guard and then use the RCU accessors to both provide correct ordering of access through the pointer. Most notably, this fixes the access from hard irq context to use the RCU read lock, which both Daniel and Tvrtko complained about. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1470761272-1245-3-git-send-email-chris@chris-wilson.co.uk |
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