[PATCH v2 12/16] netmem: use _Generic to cover const casting for page_to_netmem()
From: Byungchul Park <byungchul@sk.com>
Date: 2025-05-28 02:29:28
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> --- 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 37d0e0e002c2..4c977512f9d7 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