linux-kernel - Re: [PATCH v3] selftests/bpf: Fix u32 variable compared with less than zero

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Date:   Sat, 5 Nov 2022 11:45:44 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Kang Minchul <tegongkang@...il.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] selftests/bpf: Fix u32 variable compared with less
 than zero



On 11/5/22 11:36, Kang Minchul wrote:
> Variable ret is compared with less than zero even though it was set as u32.
> So u32 to int conversion is needed.
> 
> Signed-off-by: Kang Minchul <tegongkang@...il.com>

Acked-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>   tools/testing/selftests/bpf/xskxceiver.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
> index 681a5db80dae..162d3a516f2c 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.c
> +++ b/tools/testing/selftests/bpf/xskxceiver.c
> @@ -1006,7 +1006,8 @@ static int __send_pkts(struct ifobject *ifobject, u32 *pkt_nb, struct pollfd *fd
>   {
>   	struct xsk_socket_info *xsk = ifobject->xsk;
>   	bool use_poll = ifobject->use_poll;
> -	u32 i, idx = 0, ret, valid_pkts = 0;
> +	u32 i, idx = 0, valid_pkts = 0;
> +	int ret;
>   
>   	while (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) < BATCH_SIZE) {
>   		if (use_poll) {