Re: [PATCH] tracing: Move snapshot code out of trace.c and into trace_snapshot.c

[Steven Rostedt]

On Mon, 30 Mar 2026 16:06:44 +0200
"Arnd Bergmann" <arnd@xxxxxxxx> wrote:

> I saw the same thing and worked around it by removing the function.
> I then noticed that a bunch of code surrounding it is also unused
> and I removed that as well (see below). This version passes
> my randconfig build tests, but I suspect it is still wrong,
> since the code never had any callers and I don't understand
> why.

Note, this code is in include/linux/tracing_printk.h, and is for debugging
purposes (just like trace_printk() is). Hence, it shouldn't be removed.

The purpose is to call tracing_snapshot() when your code detects something
isn't right (but it doesn't crash), and this will take a snapshot of the
current trace that lead up to the anomaly.

If anything, I should add more to Documentation/trace/debugging.rst about it.

-- Steve