Merge branch 'split-netmem-from-struct-page'

Byungchul Park says:

====================
Split netmem from struct page

The MM subsystem is trying to reduce struct page to a single pointer.
See the following link for your information:

   https://kernelnewbies.org/MatthewWilcox/Memdescs/Path

The first step towards that is splitting struct page by its individual
users, as has already been done with folio and slab.  This patchset does
that for page pool.

Matthew Wilcox tried and stopped the same work, you can see in:

   https://lore.kernel.org/20230111042214.907030-1-willy@infradead.org

I focused on removing the page pool members in struct page this time,
not moving the allocation code of page pool from net to mm.  It can be
done later if needed.
====================

Link: https://patch.msgid.link/20250721021835.63939-1-byungchul@sk.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index a7628f5c09af..39fe28af48b9 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -917,7 +917,8 @@ nsim_pp_hold_write(struct file *file, const char __user *data,
 		if (!ns->page)
 			ret = -ENOMEM;
 	} else {
-		page_pool_put_full_page(ns->page->pp, ns->page, false);
+		page_pool_put_full_page(pp_page_to_nmdesc(ns->page)->pp,
+					ns->page, false);
 		ns->page = NULL;
 	}
 
@@ -1145,7 +1146,8 @@ void nsim_destroy(struct netdevsim *ns)
 
 	/* Put this intentionally late to exercise the orphaning path */
 	if (ns->page) {
-		page_pool_put_full_page(ns->page->pp, ns->page, false);
+		page_pool_put_full_page(pp_page_to_nmdesc(ns->page)->pp,
+					ns->page, false);
 		ns->page = NULL;
 	}