netdev - [RFC v3 12/18] netmem: use _Generic to cover const casting for page_to

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Message-Id: <20250529031047.7587-13-byungchul@sk.com>
Date: Thu, 29 May 2025 12:10:41 +0900
From: Byungchul Park <byungchul@...com>
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Subject: [RFC v3 12/18] netmem: use _Generic to cover const casting for page_to_netmem()

The current page_to_netmem() doesn't cover const casting resulting in
trying to cast const struct page * to const netmem_ref fails.

To cover the case, change page_to_netmem() to use macro and _Generic.

Signed-off-by: Byungchul Park <byungchul@...com>
Reviewed-by: Mina Almasry <almasrymina@...gle.com>
---
 include/net/netmem.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/net/netmem.h b/include/net/netmem.h
index d52f86082271..74f269c6815d 100644
--- a/include/net/netmem.h
+++ b/include/net/netmem.h
@@ -200,10 +200,9 @@ static inline netmem_ref net_iov_to_netmem(struct net_iov *niov)
 	return (__force netmem_ref)((unsigned long)niov | NET_IOV);
 }
 
-static inline netmem_ref page_to_netmem(struct page *page)
-{
-	return (__force netmem_ref)page;
-}
+#define page_to_netmem(p)	(_Generic((p),			\
+	const struct page * :	(__force const netmem_ref)(p),	\
+	struct page * :		(__force netmem_ref)(p)))
 
 /**
  * virt_to_netmem - convert virtual memory pointer to a netmem reference
-- 
2.17.1