mm/memory: return -ENOMEM for page-table allocation failure in insert_pages()

walk_to_pmd() returns NULL only when p4d_alloc(), pud_alloc(), or
pmd_alloc() fails.  These are page-table allocation failures, but
insert_pages() currently reports them as -EFAULT.

Return -ENOMEM instead, consistent with the subsequent pte_alloc() failure
and with the single-page insert_page() path, which reports failure of the
same page-table allocation chain as -ENOMEM.

Address and range validation failures in vm_insert_pages() continue to
return -EFAULT.  Keep the later -EFAULT return for pte_offset_map_lock(),
which is not an allocation failure.

Link: https://lore.kernel.org/9d990c3ed43608e674d4b12a8c221a09fd200f49.1788022178.git.thnkslprpt@gmail.com
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>

0 files changed, 0 insertions, 0 deletions