Subject: Re: [PATCH net-next v2 1/5] printk: Add execution context (task name/CPU) to printk_info

From: Breno Leitao <[email-masked]>
Date: Wed, 21 Jan 2026 03:41:49 -0800

On Tue, Jan 20, 2026 at 08:23:47AM -0800, Breno Leitao wrote:
> Extend struct printk_info to include the task name, pid, and CPU
> number where printk messages originate. This information is captured
> at vprintk_store() time and propagated through printk_message to
> nbcon_write_context, making it available to nbcon console drivers.
> 
> This is useful for consoles like netconsole that want to include
> execution context in their output, allowing correlation of messages
> with specific tasks and CPUs regardless of where the console driver
> actually runs.
> 
> The feature is controlled by CONFIG_PRINTK_EXECUTION_CTX, which is
> automatically selected by CONFIG_NETCONSOLE_DYNAMIC. When disabled,
> the helper functions compile to no-ops with no overhead.
> 
> Suggested-by: John Ogness <[email-masked]>
> Signed-off-by: Breno Leitao <[email-masked]>
> Signed-off-by: Petr Mladek <[email-masked]>
> ---
>  drivers/net/Kconfig               |  1 +
>  include/linux/console.h           |  8 ++++++
>  kernel/printk/internal.h          |  8 ++++++
>  kernel/printk/nbcon.c             | 15 +++++++++++
>  kernel/printk/printk.c            | 52 ++++++++++++++++++++++++++++++++++++++-
>  kernel/printk/printk_ringbuffer.h |  4 +++
>  lib/Kconfig.debug                 | 20 +++++++++++++++
>  7 files changed, 107 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> index ac12eaf11755d..12e47cb27ffa5 100644
> --- a/drivers/net/Kconfig
> +++ b/drivers/net/Kconfig
> @@ -341,6 +341,7 @@ config NETCONSOLE_DYNAMIC
>  	bool "Dynamic reconfiguration of logging targets"
>  	depends on NETCONSOLE && SYSFS && CONFIGFS_FS && \
>  			!(NETCONSOLE=y && CONFIGFS_FS=m)
> +	select CONSOLE_HAS_EXECUTION_CTX

This is wrong as detected by Kernel test robot.

	https://lore.kernel.org/all/[email-masked]/

On csky, CONSOLE_HAS_EXECUTION_CTX is set, but not
CONFIG_PRINTK_EXECUTION_CTX

	https://download.01.org/0day-ci/archive/20260121/[email-masked]/config

The execution context fields were not available, while
NETCONSOLE_DYNAMIC, causing a compilation error.

It needs to be:

+ select PRINTK_EXECUTION_CTX

--
pw-bot: cr