linux-kernel - [PATCH] RDMA/siw: fix pointer cast warning

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Date:   Thu, 15 Dec 2022 18:03:43 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Bernard Metzler <bmt@...ich.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] RDMA/siw: fix pointer cast warning

From: Arnd Bergmann <arnd@...db.de>

The previous build fix left a remaining issue in configurations
with 64-bit dma_addr_t on 32-bit architectures:

drivers/infiniband/sw/siw/siw_qp_tx.c: In function 'siw_get_pblpage':
drivers/infiniband/sw/siw/siw_qp_tx.c:32:37: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   32 |                 return virt_to_page((void *)paddr);
      |                                     ^

Use the same double cast here that the driver uses elsewhere
to convert between dma_addr_t and void*.

It took me a while to figure out why this driver does it
like this, as there is no hardware access and it just stores
kernel pointers in place of device addresses when communicating
with the rdma core and with user space.

Fixes: 0d1b756acf60 ("RDMA/siw: Pass a pointer to virt_to_page()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/infiniband/sw/siw/siw_qp_tx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
index 7d47b521070b..05052b49107f 100644
--- a/drivers/infiniband/sw/siw/siw_qp_tx.c
+++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
@@ -29,7 +29,7 @@ static struct page *siw_get_pblpage(struct siw_mem *mem, u64 addr, int *idx)
 	dma_addr_t paddr = siw_pbl_get_buffer(pbl, offset, NULL, idx);
 
 	if (paddr)
-		return virt_to_page((void *)paddr);
+		return virt_to_page((void *)(uintptr_t)paddr);
 
 	return NULL;
 }
-- 
2.35.1