linux-kernel - Re: [PULL}: latest tip/cpus4096 changes

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Date:	Fri, 16 Jan 2009 09:55:17 -0800
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PULL}: latest tip/cpus4096 changes

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>> --- a/arch/x86/kernel/microcode_core.c
>> +++ b/arch/x86/kernel/microcode_core.c
>> @@ -104,7 +104,7 @@ static struct microcode_ops *microcode_ops;
>>  /* no concurrent ->write()s are allowed on /dev/cpu/microcode */
>>  static DEFINE_MUTEX(microcode_mutex);
>>  
>> -struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
>> +struct ucode_cpu_info *ucode_cpu_info;
>>  EXPORT_SYMBOL_GPL(ucode_cpu_info);
>>  
>>  #ifdef CONFIG_MICROCODE_OLD_INTERFACE
>> @@ -471,6 +471,13 @@ static int __init microcode_init(void)
>>  {
>>  	struct cpuinfo_x86 *c = &cpu_data(0);
>>  	int error;
>> +	size_t size = sizeof(*ucode_cpu_info) * nr_cpu_ids;
>> +
>> +	ucode_cpu_info = kmalloc(size, GFP_KERNEL);
>> +	if (!ucode_cpu_info) {
>> +		WARN(1, "CPU: cannot allocate microcode info structure\n");
>> +		return -ENOMEM;
>> +	}
>>  
>>  	if (c->x86_vendor == X86_VENDOR_INTEL)
>>  		microcode_ops = init_intel_microcode();
> 
> look how this code continues:
> 
>         else if (c->x86_vendor == X86_VENDOR_AMD)
>                 microcode_ops = init_amd_microcode();
> 
>         if (!microcode_ops) {
>                 printk(KERN_ERR "microcode: no support for this CPU vendor\n");
>                 return -ENODEV;
>         }
> 
> see the memory leak? Again, this patch too is trivially broken.
> 
>> commit beec9183a43f8a42f5b790326a3b120a3b513590
>> Author: Mike Travis <travis@....com>
>> Date:   Fri Jan 16 00:22:33 2009 -0800
>>
>>     xen: reduce static memory usage
> 
> this one looks good in a quick check but please send it to Jeremy first or 
> get his Ack.
> 
> 	Ingo

Ok, thanks!

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