Similar to the warning in the mmu notifer, warning if an hmm mirror
callback gets it's blocking vs. nonblocking handling wrong, or if it
fails with anything else than -EAGAIN.
Cc: Jason Gunthorpe <j...@ziepe.ca>
Cc: Ralph Campbell <rcampb...@nvidia.com>
Cc: John Hubbard <jhubb...@nvidia.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Dan Carpenter <dan.carpen...@oracle.com>
Cc: Matthew Wilcox <wi...@infradead.org>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Balbir Singh <bsinghar...@gmail.com>
Cc: Ira Weiny <ira.we...@intel.com>
Cc: Souptick Joarder <jrdr.li...@gmail.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: "Jérôme Glisse" <jgli...@redhat.com>
Cc: linux...@kvack.org
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
---
mm/hmm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index 16b6731a34db..52ac59384268 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -205,6 +205,9 @@ static int hmm_invalidate_range_start(struct mmu_notifier
*mn,
ret = -EAGAIN;
break;
}
+ WARN(ret, "%pS callback failed with %d in %sblockable
context\n",
+ mirror->ops->sync_cpu_device_pagetables, ret,
+ update.blockable ? "" : "non-");
}
up_read(&hmm->mirrors_sem);
--
2.22.0
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