On Mon, Dec 29, 2025 at 05:25:08PM -0500, Mathieu Desnoyers wrote:

...

One possible compromise would be to move it to its own header file,
and introduce a CONFIG_TRACE_PRINTK Kconfig option (default Y) that
would surround an include from linux/kernel.h with a preprocessor
conditional. But please make sure the default stays as it is today:
include the trace printk header by default.

"by default" where exactly? The problem is that kernel.h is a total mess and
it's included in a lot of mysterious ways (indirectly), and in C you _must_
include a header anyway for a custom API, just define *which* one.

Based on the Steven's first replies I see a compromise in having it inside
printk.h. If you want to debug something with printf() (in general) the same
header should provide all species. Do you agree?

-- 
With Best Regards,
Andy Shevchenko