Re: [PATCH 09/22] [SCSI] mpt2sas, mpt3sas: Added a support to set cpu affinity for each MSIX vector enabled by the HBA

From: Sreekanth Reddy
Date: Thu Dec 11 2014 - 06:58:45 EST

>> @@ -1609,6 +1611,10 @@ _base_request_irq(struct MPT3SAS_ADAPTER *ioc, u8
>> index, u32 vector)
>> reply_q->ioc = ioc;
>> reply_q->msix_index = index;
>> reply_q->vector = vector;
>> +
>> + if (!zalloc_cpumask_var(&reply_q->affinity_hint, GFP_KERNEL))
>> + return -ENOMEM;
> I think this will create the problem Alex Thorlton just reported
> with lpfc on a system with a huge number (6144) of CPUs.
> See this thread:
> [BUG] kzalloc overflow in lpfc driver on 6k core system

Oh ok, Then I will use alloc_cpumask_var() API and cpumask_clear() to
initialize all the CPU bits in the mask to zero. Is it fine?

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