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netmem: use _Generic to cover const casting for page_to_netmem()

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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 <almasrymina@google.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/20250702053256.4594-5-byungchul@sk.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Byungchul Park
2025-07-02 14:32:55 +09:00
committed by Jakub Kicinski
parent b56ce86846
commit 4369d40da2
1 changed files with 3 additions and 4 deletions
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7
include/net/netmem.h
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@@ -139,10 +139,9 @@ 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