linux-kernel - Re: [PATCH v3 4/8] tracing/bpf: guard syscall probe with preempt

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Message-ID: <20241008192210.6e15bf32@gandalf.local.home>
Date: Tue, 8 Oct 2024 19:22:10 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org,
 Peter Zijlstra <peterz@...radead.org>, Alexei Starovoitov <ast@...nel.org>,
 Yonghong Song <yhs@...com>, "Paul E . McKenney" <paulmck@...nel.org>, Ingo
 Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark
 Rutland <mark.rutland@....com>, Alexander Shishkin
 <alexander.shishkin@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>,
 Andrii Nakryiko <andrii.nakryiko@...il.com>, bpf@...r.kernel.org, Joel
 Fernandes <joel@...lfernandes.org>, linux-trace-kernel@...r.kernel.org,
 Andrii Nakryiko <andrii@...nel.org>, Michael Jeanson
 <mjeanson@...icios.com>
Subject: Re: [PATCH v3 4/8] tracing/bpf: guard syscall probe with
 preempt_notrace

On Fri,  4 Oct 2024 10:58:14 -0400
Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> +#define __BPF_DECLARE_TRACE_SYSCALL(call, proto, args)			\
> +static notrace void							\
> +__bpf_trace_##call(void *__data, proto)					\
> +{									\
> +	guard(preempt_notrace)();					\
> +	CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args));	\
> +}
> +

Same here for using guard over just adding preempt_disable/enable_notrace().

-- Steve