Re: [PATCH bpf-next v3 1/2] bpf: use canonical ftrace path

[Steven Rostedt]

On Fri, 10 Mar 2023 10:52:08 -0700
zwisler@xxxxxxxxxx wrote:

> From: Ross Zwisler <zwisler@xxxxxxxxxx>
> 
> The canonical location for the tracefs filesystem is at /sys/kernel/tracing.
> 
> But, from Documentation/trace/ftrace.rst:
> 
>   Before 4.1, all ftrace tracing control files were within the debugfs
>   file system, which is typically located at /sys/kernel/debug/tracing.
>   For backward compatibility, when mounting the debugfs file system,
>   the tracefs file system will be automatically mounted at:
> 
>   /sys/kernel/debug/tracing
> 
> Many comments and samples in the bpf code still refer to this older
> debugfs path, so let's update them to avoid confusion.  There are a few
> spots where the bpf code explicitly checks both tracefs and debugfs
> (tools/bpf/bpftool/tracelog.c and tools/lib/api/fs/fs.c) and I've left
> those alone so that the tools can continue to work with both paths.
> 
> Signed-off-by: Ross Zwisler <zwisler@xxxxxxxxxx>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>

-- Steve