lkml.org 
[lkml]   [2018]   [May]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH bpf-next] xsk: fix 64-bit division
From
Date
On 05/07/2018 10:43 AM, Björn Töpel wrote:
> From: Björn Töpel <bjorn.topel@intel.com>
>
> i386 builds report:
> net/xdp/xdp_umem.o: In function `xdp_umem_reg':
> xdp_umem.c:(.text+0x47e): undefined reference to `__udivdi3'
>
> This fix uses div_u64 instead of the GCC built-in.
>
> Fixes: c0c77d8fb787 ("xsk: add user memory registration support sockopt")
> Signed-off-by: Björn Töpel <bjorn.topel@intel.com>

I don't know why the subject says xsk (instead of xdp), but anyway:

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>

Thanks.

> ---
> net/xdp/xdp_umem.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
> index 881dfdefe235..2b47a1dd7c6c 100644
> --- a/net/xdp/xdp_umem.c
> +++ b/net/xdp/xdp_umem.c
> @@ -209,7 +209,7 @@ int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
> if ((addr + size) < addr)
> return -EINVAL;
>
> - nframes = size / frame_size;
> + nframes = (unsigned int)div_u64(size, frame_size);
> if (nframes == 0 || nframes > UINT_MAX)
> return -EINVAL;
>
>


--
~Randy

\
 
 \ /
  Last update: 2018-05-07 20:26    [W:0.302 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site