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

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Date:   Thu, 15 Dec 2022 22:20:55 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Arnd Bergmann' <arnd@...nel.org>,
        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-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] RDMA/siw: fix pointer cast warning

From: Arnd Bergmann
> Sent: 15 December 2022 17:04
> 
> 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.

I hope that doesn't mean it is relying on user space only
giving it back valid values?

	David

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