linux-kernel - Re: [Patch V1 3/6] genirq: Introduce msi_domain_{alloc|free}

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Date:	Fri, 14 Nov 2014 08:18:43 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Alexander Gordeev <agordeev@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Patch V1 3/6] genirq: Introduce msi_domain_{alloc|free}_irqs()

On 2014/11/14 4:23, Marc Zyngier wrote:
> On 13/11/14 11:43, Jiang Liu wrote:
>> Introduce msi_domain_{alloc|free}_irqs() to alloc/free interrupts
>> from generic MSI irqdomain.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>> ---
>>  include/linux/msi.h |   35 ++++++++++++++++++++++++++++++
>>  kernel/irq/msi.c    |   59 +++++++++++++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 94 insertions(+)
>>
>> +/*
>> + * Default structure for MSI interrupt allocation.
>> + * Arch may overwrite it by define msi_alloc_info_t.
>> + */
>> +struct msi_alloc_info {
>> +	struct msi_desc *desc;
>> +	irq_hw_number_t hwirq;
>> +	long		scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
> 
> As much as I'm relieved to see a generic structure here, could
> scratchpad be slightly less awkward to use? Something like:
> 
> struct msi_alloc_info {
> 	[...]
> 	union	{
> 		unsigned long ul;
> 		void *ptr;
> 	} scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
> };
> 
> That would avoid some very ugly casting.
Great, will changed to this way in next version:)

> 
> Thanks,
> 
> 	M.
> 
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