Just a bit of paranoia, since if we start pushing this deep into
callchains it's hard to spot all places where an mmu notifier
implementation might fail when it's not allowed to.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Christian König" <christian.koenig@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: "Jérôme Glisse" <jglisse@xxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
mm/mmu_notifier.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 82bb1a939c0e..744840e5636e 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -190,6 +190,8 @@ int __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
pr_info("%pS callback failed with %d in %sblockable context.\n",
mn->ops->invalidate_range_start, _ret,
!blockable ? "non-" : "");
+ WARN(blockable,"%pS callback failure not allowed\n",
+ mn->ops->invalidate_range_start);
ret = _ret;
}
}
--
2.19.1
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