netdev - [PATCH net-next] net/rds: Pass a pointer to virt_to

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Message-Id: <20220829132001.114858-1-linus.walleij@linaro.org>
Date:   Mon, 29 Aug 2022 15:20:01 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com
Subject: [PATCH net-next] net/rds: Pass a pointer to virt_to_page()

Functions that work on a pointer to virtual memory such as
virt_to_pfn() and users of that function such as
virt_to_page() are supposed to pass a pointer to virtual
memory, ideally a (void *) or other pointer. However since
many architectures implement virt_to_pfn() as a macro,
this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

If we instead implement a proper virt_to_pfn(void *addr)
function the following happens (occurred on arch/arm):

net/rds/message.c:357:56: warning: passing argument 1
  of 'virt_to_pfn' makes pointer from integer without a
  cast [-Wint-conversion]

Fix this with an explicit cast.

Cc: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Cc: linux-rdma@...r.kernel.org
Cc: rds-devel@....oracle.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 net/rds/message.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rds/message.c b/net/rds/message.c
index d74be4e3f3fa..44dbc612ef54 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -354,7 +354,7 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
 
 	for (i = 0; i < rm->data.op_nents; ++i) {
 		sg_set_page(&rm->data.op_sg[i],
-				virt_to_page(page_addrs[i]),
+				virt_to_page((void *)page_addrs[i]),
 				PAGE_SIZE, 0);
 	}
 
-- 
2.37.2