From: Steven Rostedt <rostedt@kernel.org>
To: David Laight <david.laight.linux@gmail.com>
Cc: Thomas Gleixner <tglx@kernel.org>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
Masami Hiramatsu <mhiramat@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Ogness <john.ogness@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Julia Lawall <julia.lawall@inria.fr>,
Yury Norov <yury.norov@gmail.com>,
linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org, linux-rdma@vger.kernel.org,
linux-usb@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-nfs@vger.kernel.org, kvm@vger.kernel.org,
intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h
Date: Sun, 21 Jun 2026 09:03:53 -0400 [thread overview]
Message-ID: <20260621090353.24772584@fedora> (raw)
In-Reply-To: <20260621135531.243375d9@pumpkin>
On Sun, 21 Jun 2026 13:55:31 +0100
David Laight <david.laight.linux@gmail.com> wrote:
> Indeed...
> Isn't trace_printk() just an extern?
> Having it defined somewhere isn't going to make any difference to build times.
No it is not. It is a macro to cut as many nanoseconds as possible as
trace_printk() was created to debug tight race conditions and any added
latency can make the race go away.
-- Steve
prev parent reply other threads:[~2026-06-21 13:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-21 9:34 [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h Steven Rostedt
2026-06-21 9:34 ` [PATCH 1/2] tracing: Move non-trace_printk prototypes back to kernel.h Steven Rostedt
2026-06-21 13:08 ` Yury Norov
2026-06-21 13:24 ` Steven Rostedt
2026-06-21 9:34 ` [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h Steven Rostedt
2026-06-21 9:47 ` Steven Rostedt
2026-06-21 13:39 ` Yury Norov
2026-06-21 13:57 ` Yury Norov
2026-06-21 10:13 ` Thomas Gleixner
2026-06-21 10:38 ` Steven Rostedt
2026-06-21 12:55 ` David Laight
2026-06-21 13:03 ` Steven Rostedt [this message]
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