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Re: [Xen-devel] [PATCH v2 2/5] xen/common: Use %*pb[l] instead of {cpu, node}mask_scn{, list}printf()
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 9 Nov 2018 18:01:22 +0000
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- Cc: Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 09 Nov 2018 18:01:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 25/10/18 11:56, Jan Beulich wrote:
>>>> On 22.10.18 at 14:57, <andrew.cooper3@xxxxxxxxxx> wrote:
>> This removes all use of keyhandler_scratch as a bounce-buffer for the
>> rendered
>> string. In some cases, collapse combine adjacent printk()'s which are
>> writing
>> parts of the same line.
>>
>> No functional change.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
>> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>> Acked-by: Juergen Gross <jgross@xxxxxxxx>
>> ---
>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>> CC: Julien Grall <julien.grall@xxxxxxx>
>>
>> v2:
>> * Use ->bits for cpumasks
> No, I'm sorry - this is not what I gave my ack for. I specifically
> said that ->bits may only be used by the cpumask implementation.
> Everything else should use the cpumask_bits() wrapper.
cpumask_bits() is worse than useless, because it is longer than the
alternative, and results in harder to read code.
I will not be adding to its (mis)use.
>
>> --- a/xen/common/event_channel.c
>> +++ b/xen/common/event_channel.c
>> @@ -1377,11 +1377,9 @@ static void domain_dump_evtchn_info(struct domain *d)
>> unsigned int port;
>> int irq;
>>
>> - bitmap_scnlistprintf(keyhandler_scratch, sizeof(keyhandler_scratch),
>> - d->poll_mask, d->max_vcpus);
>> printk("Event channel information for domain %d:\n"
>> - "Polling vCPUs: {%s}\n"
>> - " port [p/m/s]\n", d->domain_id, keyhandler_scratch);
>> + "Polling vCPUs: {%*pbl}\n"
>> + " port [p/m/s]\n", d->domain_id, d->max_vcpus, d->poll_mask);
> Neither cpumask_bits() nor its open coding here at all?
No. Why do you think poll_mask is a cpumask? Its a straight bitmap.
~Andrew
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