[v2,12/40] mm: export symbol mmput_async

Commit Message

Jean-Philippe Brucker May 11, 2018, 7:06 p.m. UTC

In some cases releasing a mm bound to a device might invoke an exit
handler, that takes a lock already held by the function calling mmput().
This is the case for VFIO, which needs to call mmput_async to avoid a
deadlock. Other drivers using SVA might follow. Since they can be built as
modules, export the mmput_async symbol.

Cc: [e-mail]
Signed-off-by: Jean-Philippe Brucker <[e-mail]>
---
 kernel/fork.c | 1 +
 1 file changed, 1 insertion(+)

Patch

diff --git a/kernel/fork.c b/kernel/fork.c
index 1062f7450e97..bf05d188c8de 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -999,6 +999,7 @@  void mmput_async(struct mm_struct *mm)
 		schedule_work(&mm->async_put_work);
 	}
 }
+EXPORT_SYMBOL_GPL(mmput_async);
 #endif
 
 /**