[PATCH v1 4/6] mm/page_alloc: sort out the alloc_contig_range() gfp flags mess

[Zi Yan]

On 2 Dec 2024, at 7:58, David Hildenbrand wrote:

> It's all a bit complicated for alloc_contig_range(). For example, we don't
> support many flags, so let's start bailing out on unsupported
> ones -- ignoring the placement hints, as we are already given the range
> to allocate.
>
> While we currently set cc.gfp_mask, in __alloc_contig_migrate_range() we
> simply create yet another GFP mask whereby we ignore the reclaim flags
> specify by the caller. That looks very inconsistent.
>
> Let's clean it up, constructing the gfp flags used for
> compaction/migration exactly once. Update the documentation of the
> gfp_mask parameter for alloc_contig_range() and alloc_contig_pages().
>
> Signed-off-by: David Hildenbrand <david at redhat.com>
> ---
>  mm/page_alloc.c | 48 ++++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 44 insertions(+), 4 deletions(-)
>

Acked-by: Zi Yan <ziy at nvidia.com>

Best Regards,
Yan, Zi