From: Arnd Bergmann
> Sent: 17 May 2021 21:34
>
> The compat move_pages() implementation uses compat_alloc_user_space()
> for converting the pointer array. Moving the compat handling into
> the function itself is a bit simpler and lets us avoid the
> compat_alloc_user_space() call.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> mm/migrate.c | 45 ++++++++++++++++++++++++++++++---------------
> 1 file changed, 30 insertions(+), 15 deletions(-)
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index b234c3f3acb7..a68d07f19a1a 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1855,6 +1855,23 @@ static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages,
> mmap_read_unlock(mm);
> }
>
> +static int put_compat_pages_array(const void __user *chunk_pages[],
> + const void __user * __user *pages,
> + unsigned long chunk_nr)
> +{
Should that be get_compat_pages_array() ?
David
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