On Thu, 2022-01-13 at 13:29 +0100, Christian Borntraeger wrote:
> Avoid warnings on s390 like
> [ 1801.980931] CPU: 12 PID: 117600 Comm: kworker/12:0 Tainted: G            E     5.17.0-20220113.rc0.git0.32ce2abb03cf.300.fc35.s390x+next #1
> [ 1801.980938] Workqueue: events irqfd_inject [kvm]
> [...]
> [ 1801.981057] Call Trace:
> [ 1801.981060]  [<000003ff805f0f5c>] mark_page_dirty_in_slot+0xa4/0xb0 [kvm]
> [ 1801.981083]  [<000003ff8060e9fe>] adapter_indicators_set+0xde/0x268 [kvm]
> [ 1801.981104]  [<000003ff80613c24>] set_adapter_int+0x64/0xd8 [kvm]
> [ 1801.981124]  [<000003ff805fb9aa>] kvm_set_irq+0xc2/0x130 [kvm]
> [ 1801.981144]  [<000003ff805f8d86>] irqfd_inject+0x76/0xa0 [kvm]
> [ 1801.981164]  [<0000000175e56906>] process_one_work+0x1fe/0x470
> [ 1801.981173]  [<0000000175e570a4>] worker_thread+0x64/0x498
> [ 1801.981176]  [<0000000175e5ef2c>] kthread+0x10c/0x110
> [ 1801.981180]  [<0000000175de73c8>] __ret_from_fork+0x40/0x58
> [ 1801.981185]  [<000000017698440a>] ret_from_fork+0xa/0x40
> 
> when writing to a guest from an irqfd worker as long as we do not have
> the dirty ring.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

Reluctantly-acked-by: David Woodhouse <dwmw@amazon.co.uk>

... with a bucket nearby just in case.