Re: [net-next PATCHv2] bpf: Output error message to logbuf when loading failure

From: Wangnan (F)
Date: Mon Oct 26 2015 - 23:42:39 EST

On 2015/10/27 11:26, Alexei Starovoitov wrote:
On Mon, Oct 26, 2015 at 07:13:08AM +0000, Wang Nan wrote:
Many reasons can make bpf_prog_load() return EINVAL. This patch utilizes
logbuf to deliver the actual reason of the failure.

Without this patch, it is very easy for user to pass an object with
"version" section not match the kernel version code, and the problem
is hard to determine from return code (EINVAL).

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
for both implementation and design.
OK. Let perf to report error message.

Thank you.

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