Re: arch/i386/kernel/mpparse.c warning fixes

[William Lee Irwin III]

William Lee Irwin III writes:
>> -	if (m->mpc_apicid > MAX_APICS) {
>> +	if (MAX_APICS - m->mpc_apicid <= 0) {
>>  		printk(KERN_WARNING "Processor #%d INVALID. (Max ID: %d).\n",
>>  			m->mpc_apicid, MAX_APICS);
>>  		--num_processors;

On Thu, May 22, 2003 at 06:07:43PM +0200, [e-mail] wrote:
> Eeew. Whatever the original problem is, this "fix" is just too
> obscure and ugly.

m->mpc_apicid is an 8-bit type; MAX_APICS can be 256. The above fix
properly compares two integral expressions of equal width.

Also, as MAX_APICS-1 is reserved for the broadcast physical APIC ID
(it's 0xF for serial APIC and 0xFF for xAPIC) the small semantic change
here is correct.

-- wli