On 12/12/2014 04:30 AM, Pavel Machek wrote:
>> +	depends on CPU_SUP_INTEL
>> +	---help---
>> +	  MPX provides hardware features that can be used in
>> +	  conjunction with compiler-instrumented code to check
>> +	  memory references.  It is designed to detect buffer
>> +	  overflow or underflow bugs.
>> +
>> +	  This option enables running applications which are
>> +	  instrumented or otherwise use MPX.  It does not use MPX
>> +	  itself inside the kernel or to protect the kernel
>> +	  against bad memory references.
>> +
>> +	  Enabling this option will make the kernel larger:
>> +	  ~8k of kernel text and 36 bytes of data on a 64-bit
>> +	  defconfig.  It adds a long to the 'mm_struct' which
>> +	  will increase the kernel memory overhead of each
>> +	  process and adds some branches to paths used during
>> +	  exec() and munmap().
> 
> Should you explain what kind of CPUs support it? Basically "the kind
> you don't have, yet"?

On a practical level, you can look for mpx in cpuinfo a la:

	cat /proc/cpuinfo  | grep ' mpx '

to see if your CPU supports it.  I will mention that in the the
Documentation/ and also point folks there from the Kconfig text.