On Wed, Jan 03, 2024 at 05:14:18PM +0800, peterx@redhat.com wrote:

From: Peter Xu <peterx@redhat.com>

no_page_table() is not yet used for hugetlb code paths. Make it prepared.

The major difference here is hugetlb will return -EFAULT as long as page
cache does not exist, even if VM_SHARED.  See hugetlb_follow_page_mask().

Pass "address" into no_page_table() too, as hugetlb will need it.

Reviewed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 mm/gup.c | 44 ++++++++++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 18 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason