linux-kernel - Re: [PATCH] selftests/ftrace: Let fprobe test consider already enabled functions

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Message-ID: <20250226152835.23133Bd0-hca@linux.ibm.com>
Date: Wed, 26 Feb 2025 16:28:35 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Mark Rutland <mark.rutland@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sven Schnelle <svens@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/ftrace: Let fprobe test consider already
 enabled functions

On Wed, Feb 26, 2025 at 11:54:47PM +0900, Masami Hiramatsu wrote:
> On Wed, 26 Feb 2025 15:27:03 +0100
> Heiko Carstens <hca@...ux.ibm.com> wrote:
> 
> > The fprobe test fails on Fedora 41 since the fprobe test assumption that
> > the number of enabled_functions is zero before the test starts is not
> > necessarily true. Some user space tools, like systemd, add BPF programs
> > that attach to functions. Those will show up in the enabled_functions table
> > and must be taken into account by the fprobe test.
> 
> Hmm, this ftrace selftests has been expected to be run without 
> any BPF programs... Is there any other issue on other test cases?

At least on s390 all tests pass now.

That is of course except for the "add/remove/test uprobe events" test
where I sent a patch. Not sure what will happen with that one:

https://lore.kernel.org/all/20250220130102.2079179-1-hca@linux.ibm.com/