linux-kernel - Re: [PATCH v1] Revert "tracing: Fix tracing_marker may trigger page fault during preempt

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Message-ID: <20251007174208.11fd02da@gandalf.local.home>
Date: Tue, 7 Oct 2025 17:42:08 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Runping Lai <runpinglai@...gle.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Wattson CI <wattson-external@...gle.com>,
 kernel-team@...roid.com, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Luo Gengkun
 <luogengkun@...weicloud.com>, Linus Torvalds
 <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v1] Revert "tracing: Fix tracing_marker may trigger page
 fault during preempt_disable"

On Tue, 7 Oct 2025 16:31:41 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> +static void trace_user_fault_buffer_free(struct trace_user_buf_info *tinfo)
> +{
> +	char *buf;
> +	int cpu;
> +
> +	for_each_possible_cpu(cpu) {
> +		buf = per_cpu_ptr(tinfo->tbuf, cpu)->buf;
> +		kfree(buf);
> +	}

Oops, missed:

	free_percpu(tinfo->tbuf);

here.

-- Steve

> +	kfree(tinfo);
> +}