Re: [PATCH net] RDMA/mana_ib: use the correct page size for mapping user-mode doorbell page

[Simon Horman <horms@kernel.org>]

On Wed, Aug 28, 2024 at 01:06:09PM -0700, longli@linuxonhyperv.com wrote:
> From: Long Li <longli@microsoft.com>
> 
> When mapping doorbell page from user-mode, the driver should use the system
> page size as the doorbell is allocated via mmap() from user-mode.
> 
> Cc: stable@vger.kernel.org
> Fixes: 0266a177631d ("RDMA/mana_ib: Add a driver for Microsoft Azure Network Adapter")
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
>  drivers/infiniband/hw/mana/main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mana/main.c b/drivers/infiniband/hw/mana/main.c
> index f68f54aea820..b26c4ebec2e0 100644
> --- a/drivers/infiniband/hw/mana/main.c
> +++ b/drivers/infiniband/hw/mana/main.c
> @@ -511,13 +511,13 @@ int mana_ib_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma)
>  	      PAGE_SHIFT;
>  	prot = pgprot_writecombine(vma->vm_page_prot);
>  
> -	ret = rdma_user_mmap_io(ibcontext, vma, pfn, gc->db_page_size, prot,
> +	ret = rdma_user_mmap_io(ibcontext, vma, pfn, PAGE_SIZE, prot,
>  				NULL);
>  	if (ret)
>  		ibdev_dbg(ibdev, "can't rdma_user_mmap_io ret %d\n", ret);
>  	else
>  		ibdev_dbg(ibdev, "mapped I/O pfn 0x%llx page_size %u, ret %d\n",
> -			  pfn, gc->db_page_size, ret);
> +			  pfn, PAGE_SIZE, ret);

This is not a full review, but according to both clang-18 and gcc-14,
this patch should also update the format specifier from %u to %lu.

>  
>  	return ret;
>  }
> -- 
> 2.17.1
> 
>