linux-kernel - Re: [PATCH] RDMA/siw: Solve the error of compiling the 32BIT mips kernel when enable CONFIG_RDMA

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Date:   Thu, 22 Sep 2022 14:02:57 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     jianghaoran <jianghaoran@...inos.cn>
Cc:     bmt@...ich.ibm.com, leon@...nel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/siw: Solve the error of compiling the 32BIT mips
 kernel when enable CONFIG_RDMA_SIW

On Thu, Sep 01, 2022 at 01:51:38PM +0800, jianghaoran wrote:
> cross-compilation environment：
> ubuntu 20.04
> mips-linux-gnu-gcc (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
> 
> generate a configuration file by make randconfig:
> CONFIG_32BIT=y
> CONFIG_RDMA_SIW=y
> 
> the error message as follows：
> In file included from ../arch/mips/include/asm/page.h:270,
>                  from ../arch/mips/include/asm/io.h:29,
>                  from ../arch/mips/include/asm/mmiowb.h:5,
>                  from ../include/linux/spinlock.h:64,
>                  from ../include/linux/wait.h:9,
>                  from ../include/linux/net.h:19,
>                  from ../drivers/infiniband/sw/siw/siw_qp_tx.c:8:
> ../drivers/infiniband/sw/siw/siw_qp_tx.c: In function ‘siw_tx_hdt’:
> ../arch/mips/include/asm/page.h:255:53: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>   255 | #define virt_to_pfn(kaddr)    PFN_DOWN(virt_to_phys((void *)(kaddr)))
>       |                                                     ^
> ../include/asm-generic/memory_model.h:18:41: note: in definition of macro ‘__pfn_to_page’
>    18 | #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
>       |                                         ^~~
> ../arch/mips/include/asm/page.h:255:31: note: in expansion of macro ‘PFN_DOWN’
>   255 | #define virt_to_pfn(kaddr)    PFN_DOWN(virt_to_phys((void *)(kaddr)))
>       |                               ^~~~~~~~
> ../arch/mips/include/asm/page.h:256:41: note: in expansion of macro ‘virt_to_pfn’
>   256 | #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
>       |                                         ^~~~~~~~~~~
> ../drivers/infiniband/sw/siw/siw_qp_tx.c:538:23: note: in expansion of macro ‘virt_to_page’
>   538 |     page_array[seg] = virt_to_page(va & PAGE_MASK);
>       |                       ^~~~~~~~~~~~
> cc1: all warnings being treated as errors
> make[5]: *** [../scripts/Makefile.build:249: drivers/infiniband/sw/siw/siw_qp_tx.o] Error 1
> make[4]: *** [../scripts/Makefile.build:465: drivers/infiniband/sw/siw] Error 2
> make[3]: *** [../scripts/Makefile.build:465: drivers/infiniband/sw] Error 2
> make[3]: *** Waiting for unfinished jobs....
> 
> Reported-by: k2ci <kernel-bot@...inos.cn>
> Signed-off-by: jianghaoran <jianghaoran@...inos.cn>
> ---
>  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 1f4e60257700..55ed0c27f449 100644
> --- a/drivers/infiniband/sw/siw/siw_qp_tx.c
> +++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
> @@ -533,7 +533,7 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
>  					kunmap_local(kaddr);
>  				}
>  			} else {
> -				u64 va = sge->laddr + sge_off;
> +				unsigned long va = sge->laddr + sge_off;

The compiler is saying it should be a void * not an unsigned long.

Jason