Re: [PATCH v5] xen/common: add keyhandler to show Xen command line

[Jan Beulich <jbeulich@suse.com>]

On 13.08.2026 05:51, dmukhin@ford.com wrote:
> From: Denis Mukhin <dmukhin@ford.com> 
> 
> Currently there's no way to print Xen command line on the emergency
> console for debugging purposes when 'xl' is unavailable.
> 
> Add new keyhander '?' to do command line printout.
> 
> To allow built-in command printout, drop __initconst in
> 'opt_builtin_cmdline' declaration.
> 
> Signed-off-by: Denis Mukhin <dmukhin@ford.com>
> ---
> Changes since v4:
> - promote opt_builtin_cmdline to __ro_after_init and use it for
>   built-in command line reporting
> - account for empty saved_cmdline
> - adjust register_keyhandler() call - use '?'

This isn't quite what I was expecting, following the feedback you got on
v4. My expectation was that we'd see a 2-patch series, first patch moving
non-help stuff out of the 'h' handler, second patch adding the dumping of
the command line. Naturally the new handler then wouldn't be named
show_cmdline(). I'd then further expect tat no new use of
register_keyhandler() would be necessary: The handler itself would live
in keyhandler.c, and print_version() would then be accompanied by a new
print_cmdline().

Jan