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 <danieltim...@gmail.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
