netdev - Re: [PATCH] samples: bpf: fix: broken sample regarding removed function

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Date:   Wed, 27 Feb 2019 06:40:36 +0000
From:   Martin Lau <kafai@...com>
To:     "Daniel T. Lee" <danieltimlee@...il.com>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] samples: bpf: fix: broken sample regarding removed
 function

On Tue, Feb 26, 2019 at 10:05:59PM -0500, Daniel T. Lee wrote:
> Currently, running sample "task_fd_query" and "tracex3" occurs the
> following error. On kernel v5.0-rc* this sample will be unavailable
> due to the removal of function 'blk_start_request' at commit "a1ce35f".
> (function removed, as "Single Queue IO scheduler" no longer exists)
> 
> $ sudo ./task_fd_query
> failed to create kprobe 'blk_start_request' error 'No such file or
> directory'
> 
> This commit will change the function 'blk_start_request' to
> 'blk_mq_start_request' to fix the broken sample.
> 
> Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
> ---
>  samples/bpf/task_fd_query_kern.c | 2 +-
>  samples/bpf/task_fd_query_user.c | 2 +-
>  samples/bpf/tracex3_kern.c       | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/samples/bpf/task_fd_query_kern.c b/samples/bpf/task_fd_query_kern.c
> index f4b0a9ea674d..5f1b2cdababd 100644
> --- a/samples/bpf/task_fd_query_kern.c
> +++ b/samples/bpf/task_fd_query_kern.c
> @@ -4,7 +4,7 @@
>  #include <uapi/linux/bpf.h>
>  #include "bpf_helpers.h"
>  
> -SEC("kprobe/blk_start_request")
> +SEC("kprobe/blk_mq_start_requset")
I suspect it does not run.  Have you tested it?

There is a typo:
blk_mq_start_requSEt
blk_mq_start_requESt