On 4/3/26 01:59, Anthony Yznaga wrote:
> 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 effect.
>
> Fixes: 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily
> freeable mappings")
> Cc: <[email protected]>
> Signed-off-by: Anthony Yznaga <[email protected]>
Acked-by: Vlastimil Babka (SUSE) <[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.
> *
