On configs where MAP_DROPPABLE is not supported (currently any 32-bit
config except for PPC32), mmap fails with errno set to ENOTSUPP.
However, ENOTSUPP is not a standard error value that userspace knows
about. The acceptable userspace-visible errno to use is EOPNOTSUPP.
checkpatch.pl has a warning to this affect.
Fixes: 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily
freeable mappings")
Cc: <[email protected]>
Signed-off-by: Anthony Yznaga <[email protected]>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 5754d1c36462..2311ae7c2ff4 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -504,7 +504,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
break;
case MAP_DROPPABLE:
if (VM_DROPPABLE == VM_NONE)
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
/*
* A locked or stack area makes no sense to be
droppable.
*
--
2.47.3
