Thread (24 messages) 24 messages, 5 authors, 2025-07-15
STALE349d REVIEWED: 4 (2M)
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[PATCH net-next v7 5/7] netmem: use _Generic to cover const casting for page_to_netmem()

From: Byungchul Park <byungchul@sk.com>
Date: 2025-06-25 04:34:01
Also in: bpf, linux-mm, linux-rdma, lkml
Subsystem: networking [general], the rest · Maintainers: "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds

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@sk.com>
Reviewed-by: Mina Almasry <redacted>
Reviewed-by: Toke Høiland-Jørgensen <redacted>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.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 e9eee8f680d5..535cf17b9134 100644
--- a/include/net/netmem.h
+++ b/include/net/netmem.h
@@ -213,10 +213,9 @@ 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(const 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
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