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We're starting to require the reservation lock for pinning,
so wait until we have that.

Update the selftests to handle this correctly, and ensure pin is
called in live_hwsp_rollover_user() and mock_hwsp_freelist().

Changes since v1:
- Fix NULL + XX arithmatic, use casts. (kbuild)
Changes since v2:
- Clear entire cacheline when pinning.
Changes since v3:
- CACHELINE_BYTES -> TIMELINE_SEQNO_BYTES. (jekstrand)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323155059.628690-3-maarten.lankhorst@linux.intel.com