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Re: [Xen-devel] [PATCH v2 for-4.12] xen/cmdline: Work around some specific command line warnings
- To: Juergen Gross <jgross@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 30 Jan 2019 17:07:54 +0000
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- Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 30 Jan 2019 17:09:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 30/01/2019 16:31, Juergen Gross wrote:
> On 30/01/2019 16:55, Andrew Cooper wrote:
>> Xen will warn when an unknown parameter is found in the command line. e.g.
>>
>> (d8) [ 1556.334664] (XEN) parameter "pv-shim" unknown!
>>
>> One case where this goes wrong is a workaround for an old grub bug, which
>> resulted in "placeholder" being prepended to the command line.
>>
>> Another case is when booting a CONFIG_PV_SHIM_EXCLUSIVE build, in which the
>> parsing for the "pv-shim" parameter is discarded.
>>
>> Introduce ignore_param() and OPT_IGNORE to cope with known cases, where
>> warning the user is the wrong course of action to take.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> CC: Juergen Gross <jgross@xxxxxxxx>
>>
>> v2:
>> * Rewrite from scratch, following Juergen's suggestion
>>
>> An implementation detail of ignore_param() is that it can only be used once
>> per translation unit, which is fine for now. Two options to fix this are to
>> tokenise __LINE__ in (requires some extreme preprocessor magic to make work,
>> as ## inhibits expansion, and may cause livepatching issues), or to retain
>> the
>> _val parameter and require callers to just pass in a unique string.
> Or make the unique string an optional parameter via:
>
> #define ignore_param(_name, uniq...) \
> __setup_str __setup_str_ign ## uniq[] = _name; \
> __kparam __setup_ign ## uniq = \
> { .name = __setup_str_ign ## uniq, \
> .type = OPT_IGNORE }
>
> With or without that change:
>
> Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
> Release-acked-by: Juergen Gross <jgross@xxxxxxxx>
Actually I like this as an option. I'll fold this in, along with Jan's
namespacing request.
~Andrew
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