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

Steven Rostedt <[email protected]>
Newsgroups gmane.comp.file-systems.ext4,gmane.linux.kernel,gmane.linux.documentation,gmane.linux.kbuild.devel,gmane.linux.ports.ppc64.devel,gmane.comp.video.dri.devel,gmane.linux.ports.arm.kernel,gmane.linux.drivers.rdma,gmane.linux.usb.general,gmane.linux.nfs,gmane.comp.emulators.kvm.devel,gmane.comp.freedesktop.xorg.drivers.intel
Message-ID <20260621090353.24772584@fedora> 
On Sun, 21 Jun 2026 13:55:31 +0100
David Laight <[email protected]> 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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