netdev - [PATCH 14/18] netmem: use _Generic to cover const casting for page_to

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Message-Id: <20250523032609.16334-15-byungchul@sk.com>
Date: Fri, 23 May 2025 12:26:05 +0900
From: Byungchul Park <byungchul@...com>
To: willy@...radead.org,
	netdev@...r.kernel.org
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Subject: [PATCH 14/18] 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>
---
 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 29c005d70c4f..c2eb121181c2 100644
--- a/include/net/netmem.h
+++ b/include/net/netmem.h
@@ -172,10 +172,9 @@ 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)))
 
 static inline netmem_ref alloc_netmems_node(int nid, gfp_t gfp_mask,
 		unsigned int order)
-- 
2.17.1