From: "Pratyush Yadav (Google)" <pratyush@kernel.org>

While the liveupdate= parameter is documented in kernel-parameters.txt,
it is not listed in LUO's user facing documentation. This can make it
hard for users to figure out how to enable the subsystem, since enabling
just the config isn't enough.

Note the need for the kernel parameter in LUO core documentation, which
gets exported to Documentation/core-api/liveupdate.rst.

Suggested-by: Luca Boccassi <luca.boccassi@gmail.com>
Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>
---

Notes:
    I think we should take this patch through the liveupdate/fixes branch.

 kernel/liveupdate/luo_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/liveupdate/luo_core.c b/kernel/liveupdate/luo_core.c
index 803f51c84275..5d5827ced73c 100644
--- a/kernel/liveupdate/luo_core.c
+++ b/kernel/liveupdate/luo_core.c
@@ -36,6 +36,10 @@
  *
  * LUO uses Kexec Handover to transfer memory state from the current kernel to
  * the next kernel. For more details see Documentation/core-api/kho/index.rst.
+ *
+ * .. note::
+ *     To enable LUO, boot the kernel with the ``liveupdate=on`` command line
+ *     parameter.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

base-commit: b1378127003b61930ce30064328640503ad3ef6d
-- 
2.54.0.563.g4f69b47b94-goog

On Tue, 19 May 2026 14:57:06 +0200, Pratyush Yadav wrote:
> While the liveupdate= parameter is documented in kernel-parameters.txt,
> it is not listed in LUO's user facing documentation. This can make it
> hard for users to figure out how to enable the subsystem, since enabling
> just the config isn't enough.
> 
> Note the need for the kernel parameter in LUO core documentation, which
> gets exported to Documentation/core-api/liveupdate.rst.
> 
> [...]

Applied, thanks!

[1/1] liveupdate: document liveupdate=on
      commit: d65d7e28888a6f3a1999908cacadd99f4c14ddd9

Best regards,
-- 
Pasha Tatashin <pasha.tatashin@soleen.com>

On Tue, 19 May 2026 at 13:57, Pratyush Yadav <pratyush@kernel.org> wrote:
>
> From: "Pratyush Yadav (Google)" <pratyush@kernel.org>
>
> While the liveupdate= parameter is documented in kernel-parameters.txt,
> it is not listed in LUO's user facing documentation. This can make it
> hard for users to figure out how to enable the subsystem, since enabling
> just the config isn't enough.
>
> Note the need for the kernel parameter in LUO core documentation, which
> gets exported to Documentation/core-api/liveupdate.rst.
>
> Suggested-by: Luca Boccassi <luca.boccassi@gmail.com>
> Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>
> ---
>
> Notes:
>     I think we should take this patch through the liveupdate/fixes branch.
>
>  kernel/liveupdate/luo_core.c | 4 ++++
>  1 file changed, 4 insertions(+)

Acked-by: Luca Boccassi <luca.boccassi@gmail.com>