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Subject: RE: [PATCH]2.6.3-rc2 MSI Support for IA64
Date: Fri, 20 Feb 2004 10:36:12 -0800
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Thread-Topic: [PATCH]2.6.3-rc2 MSI Support for IA64
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From: "Nguyen, Tom L" <tom.l.nguyen@intel.com>
To: "Andreas Schwab" <schwab@suse.de>
Cc: <greg@kroah.com>, <linux-kernel@vger.kernel.org>,
       "Nakajima, Jun" <jun.nakajima@intel.com>,
       "Luck, Tony" <tony.luck@intel.com>,
       "Nguyen, Tom L" <tom.l.nguyen@intel.com>
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Friday, Feb. 20, 2004 8:55 AM, Andreas Schwab wrote:

>> @@ -316,6 +310,19 @@
>>  	return current_vector;
>>  }
>>  
>> +int ia64_alloc_vector(void)
>> +{
>> +	static int next_vector = IA64_FIRST_DEVICE_VECTOR;
>> +
>> +	if (next_vector > IA64_LAST_DEVICE_VECTOR)
>> +		/* XXX could look for sharable vectors instead of panic'ing... */
>> +		panic("ia64_alloc_vector: out of interrupt vectors!");
>> +
>> +	nr_alloc_vectors++;
>> +
>> +	return next_vector++;
>> +}
>> +

> IMHO this should be CONFIG_IA64 only.

To avoid some #ifdef statements as possible, "ia64_platform" 
defined in the header file "msi.h" is set to TRUE only if 
setting CONFIG_IA64 to 'Y'. The setting of ia64_platform
to TRUE will execute function ia64_alloc_vector.

This API is only used in assign_msi_vector()in msi.c:

	vector = (ia64_platform ? ia64_alloc_vector() :
		assign_irq_vector(MSI_AUTO));

Thanks,
Long