linux-kernel - RE: [PATCH 9/9] samples/bpf: test percpu array map

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Date:	Tue, 12 Jan 2016 15:44:49 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Ming Lei' <tom.leiming@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <ast@...nel.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	"Martin KaFai Lau" <kafai@...com>
Subject: RE: [PATCH 9/9] samples/bpf: test percpu array map

From: Ming Lei
> Sent: 11 January 2016 15:57
...
> ---
>  samples/bpf/test_maps.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 110 insertions(+)
> 
> diff --git a/samples/bpf/test_maps.c b/samples/bpf/test_maps.c
> index 6299ee9..ff5d373 100644
> --- a/samples/bpf/test_maps.c
> +++ b/samples/bpf/test_maps.c
> @@ -142,6 +142,106 @@ static void test_arraymap_sanity(int i, void *data)
>  	close(map_fd);
>  }
> 
> +static int handle_one_cpu(unsigned cpu, void *val_cpu, void *val)
> +{
> +	unsigned long *cnt = val;
> +
> +	*cnt += *(long *)val_cpu;

Integer pointer casts ring big alarm bells - they are accidents
waiting to happen.

If the pointers are 'pointer to long' then define them as such.

	David