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Re: [PATCH v4] xen/common: add keyhandler to show Xen command line
- To: dmukhin@xxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 12 Aug 2026 09:35:54 +0200
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger@xxxxxxxxxxxxxx, sstabellini@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 12 Aug 2026 07:40:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.08.2026 23:09, dmukhin@xxxxxxxx wrote:
> @@ -505,6 +506,37 @@ static int __init cf_check param_init(void)
> __initcall(param_init);
> #endif
>
> +static void cf_check show_cmdline(unsigned char key)
> +{
> + const char *builtin_cmdline = CONFIG_CMDLINE;
Maybe compilers manage to optimize this to the equivalent of
static const char builtin_cmdline[] = CONFIG_CMDLINE;
yet even then I see no reason why it wouldn't want spelling that way anyway.
Plus this raises the question: Why would we need two instances of the string
in the Xen image? If you need the literal at runtime, re-use
opt_builtin_cmdline[] by dropping __initconst from it.
> + const char *cmdline;
> +
> + printk("'%c' pressed -> showing hypervisor command line\n", key);
> +
> + if ( builtin_cmdline[0] )
> + cmdline = builtin_cmdline;
> + else
> + cmdline = "<NULL>";
> +
> + printk("Built-in command line: %s\n", cmdline);
What use is this line when <NULL> is shown?
Jan
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