Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h

[PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-21
[PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Steven Rostedt <rostedt@goodmis.org> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Yury Norov <yury.norov@gmail.com> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Yury Norov <yury.norov@gmail.com> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Thomas Gleixner <tglx@kernel.org> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Steven Rostedt <rostedt@goodmis.org> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · David Laight <hidden> · 2026-06-21
Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-21
[PATCH 1/2] tracing: Move non-trace_printk prototypes back to kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-21
Re: [PATCH 1/2] tracing: Move non-trace_printk prototypes back to kernel.h · Yury Norov <yury.norov@gmail.com> · 2026-06-21
Re: [PATCH 1/2] tracing: Move non-trace_printk prototypes back to kernel.h · Steven Rostedt <rostedt@goodmis.org> · 2026-06-21
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · "Christophe Leroy (CS GROUP)" <chleroy@kernel.org> · 2026-06-22
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-22
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Yury Norov <yury.norov@gmail.com> · 2026-06-22
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Peter Zijlstra <peterz@infradead.org> · 2026-06-22
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-22
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Randy Dunlap <hidden> · 2026-06-22
Re: [PATCH 0/2] tracing: Move trace_printk.h out of kernel.h · Steven Rostedt <rostedt@kernel.org> · 2026-06-22

From: Steven Rostedt <rostedt@kernel.org>
Date: 2026-06-21 13:04:04
Also in: dri-devel, intel-gfx, kvm, linux-arm-kernel, linux-doc, linux-ext4, linux-kbuild, linux-nfs, linux-rdma, linux-trace-kernel, linux-usb, lkml

On Sun, 21 Jun 2026 13:55:31 +0100
David Laight [off-list ref] 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

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