Re: [Xen-devel] [PATCH v2 52/52] xen: make some console related parameters settable at runtime

[Juergen Gross <jgross@xxxxxxxx>]

On 15/08/17 17:45, Jan Beulich wrote:
>>>> On 14.08.17 at 09:08, <jgross@xxxxxxxx> wrote:
>> --- a/xen/drivers/char/console.c
>> +++ b/xen/drivers/char/console.c
>> @@ -41,6 +41,7 @@ string_param("console", opt_console);
>>  /*         boots. Any other value, or omitting the char, enables 
>> auto-switch 
>> */
>>  static unsigned char __read_mostly opt_conswitch[3] = "a";
>>  string_param("conswitch", opt_conswitch);
>> +string_param_runtime("conswitch", opt_conswitch);
> 
> Do you envision parameters which can only be set at runtime?
> Otherwise, to avoid the two going out of sync (as well as the
> redundancy) wouldn't it make sense for xyz_param_runtime()
> to do what it does now _and_ invoke xyz_param()?

There might be params requiring another handler (e.g. taking a lock,
allocating some memory, ...).

Having a macro for doing both (like above case) seems appropriate.
Any naming ideas? E.g.:

string_param_anytime() ?

Not sure whether I should add ;-)


Juergen


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