linux-kernel - Re: [PATCH v3] tracing: Guard __DECLARE_TRACE() use of __DO_TRACE

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Message-ID: <075fd9e5-2db8-4030-9364-0be5e22e9902@paulmck-laptop>
Date: Mon, 8 Dec 2025 12:46:32 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	bpf@...r.kernel.org
Subject: Re: [PATCH v3] tracing: Guard __DECLARE_TRACE() use of
 __DO_TRACE_CALL() with SRCU-fast

On Mon, Dec 08, 2025 at 04:43:52AM -0500, Steven Rostedt wrote:
> On Sun, 7 Dec 2025 20:20:23 -0800
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > [ paulmck: Remove trace_syscalls.h changes per Steven Rostedt. ]
> 
> But they still need to be fixed.
> 
> With PREEMPT_RT enabled:
> 
>  # trace-cmd start -e syscalls
>  # trace-cmd show
>             bash-1165    [001] DBZ.f   269.955644: sys_ioctl(fd: 0xff, cmd: 0x5413, arg: 0x7fffd3d6a2d0)
>             bash-1165    [001] DBZ.f   269.955649: sys_ioctl -> 0x0
>             bash-1165    [001] DBZ.f   269.955694: sys_rt_sigprocmask(how: 2, nset: 0x7fffd3d6a3a0, oset: 0, sigsetsize: 8)
>             bash-1165    [001] DBZ.f   269.955698: sys_rt_sigprocmask -> 0x0
>             bash-1165    [001] DBZ.f   269.955715: sys_wait4(upid: 0xffffffffffffffff, stat_addr: 0x7fffd3d69c50, options: 0xb, ru: 0)
>             bash-1165    [001] DBZ.f   269.955722: sys_wait4 -> 0xfffffffffffffff6
>             bash-1165    [001] DBZ.f   269.955725: sys_rt_sigreturn()
>             bash-1165    [001] DBZ.f   269.955758: sys_rt_sigaction(sig: 2, act: 0x7fffd3d6a2e0, oact: 0x7fffd3d6a380, sigsetsize: 8)
>             bash-1165    [001] DBZ.f   269.955762: sys_rt_sigaction -> 0x0
>                                ^^^^^
>                             This is just garbage.

Yes, but is is the original garbage, and garbage obtained by acceding
to your request.  ;-)

Perhaps a little bit more constructively, have your conflicting changes
hit mainline yet?

							Thanx, Paul