diff options
| author | David Hildenbrand <david@redhat.com> | 2018-02-07 12:46:45 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2018-02-20 20:51:21 +0000 |
| commit | 1575767ef3cf5326701d2ae3075b7732cbc855e4 (patch) | |
| tree | 5576bfba708a2604ddd930b0d90e75d88598c557 /drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | |
| parent | d16b52cb9cdb6f06dea8ab2f0a428e7d7f0b0a81 (diff) | |
KVM: s390: consider epoch index on TOD clock syncs
For now, we don't take care of over/underflows. Especially underflows
are critical:
Assume the epoch is currently 0 and we get a sync request for delta=1,
meaning the TOD is moved forward by 1 and we have to fix it up by
subtracting 1 from the epoch. Right now, this will leave the epoch
index untouched, resulting in epoch=-1, epoch_idx=0, which is wrong.
We have to take care of over and underflows, also for the VSIE case. So
let's factor out calculation into a separate function.
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180207114647.6220-5-david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: 8fa1696ea781 ("KVM: s390: Multiple Epoch Facility support")
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[use u8 for idx]
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c')
0 files changed, 0 insertions, 0 deletions