Hi!
> + If unsure, say Y.
"If you bought your cpu in 2014 or earlier, say N here".
:-)
> -Note: Currently no hardware with MPX ISA is available but it is always
> +Note: As of December 2014, no hardware with MPX is available but it is
> possible to use SDE (Intel(R) Software Development
On 12/10/2014 12:49 PM, Linus Torvalds wrote:
> On Wed, Dec 10, 2014 at 12:39 PM, Dave Hansen
> wrote:
>>
>> I misspoke there. I meant SMAP (I placed MPX below its config option).
>
> Ok, I agree on SMAP, we might want to have that be configurable too,
> especially for smaller systems (I *think*
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
>> + overflo
> +config X86_INTEL_MPX
> + prompt "Intel MPX (Memory Protection Extensions)"
> + def_bool y
bool?
> + depends on CPU_SUP_INTEL
> + ---help---
> + MPX provides hardware features that can be used in
> + conjunction with compiler-instrumented code to check
> + mem
* Dave Hansen wrote:
> +config X86_INTEL_MPX
> + prompt "Intel MPX (Memory Protection Extensions)"
> + def_bool y
> + depends on CPU_SUP_INTEL
> + ---help---
> + MPX provides hardware features that can be used in
> + conjunction with compiler-instrumented code to chec
On 12/10/2014 10:19 PM, Ingo Molnar wrote:
> * Dave Hansen wrote:
>> @@ -1575,6 +1571,27 @@ config X86_SMAP
>>
>>If unsure, say Y.
>>
>> +config X86_INTEL_MPX
>> +prompt "Intel MPX (Memory Protection Extensions)" if EXPERT
>
> I think the 'if EXPERT' needs to be dropped.
Fine wit
* Dave Hansen wrote:
> @@ -1575,6 +1571,27 @@ config X86_SMAP
>
> If unsure, say Y.
>
> +config X86_INTEL_MPX
> + prompt "Intel MPX (Memory Protection Extensions)" if EXPERT
I think the 'if EXPERT' needs to be dropped.
> + def_bool y
> + depends on CPU_SUP_INTEL
On the
On 12/10/2014 06:14 PM, Eric W. Biederman wrote:
> Thomas Gleixner writes:
>> please pull the latest x86-mpx-for-linus git tree from:
>>
>>git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
>> x86-mpx-for-linus
>>
>> This enables support for x86 MPX:
>>
>> MPX is a new debug feature
Thomas Gleixner writes:
> Linus,
>
> please pull the latest x86-mpx-for-linus git tree from:
>
>git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-mpx-for-linus
>
> This enables support for x86 MPX:
>
> MPX is a new debug feature for bound checking in user space. It
> requires
On Wed, Dec 10, 2014 at 12:39 PM, Dave Hansen
wrote:
>
> I misspoke there. I meant SMAP (I placed MPX below its config option).
Ok, I agree on SMAP, we might want to have that be configurable too,
especially for smaller systems (I *think* SMAP is big-core only,
right?). I'm not sure how much of
On 12/10/2014 11:49 AM, Linus Torvalds wrote:
> On Wed, Dec 10, 2014 at 11:41 AM, Dave Hansen
> wrote:
>> But, this is the kind of option that we want to be *sure* is enabled
>> unless folks know exactly what they are doing, so we should probably
>> hide it behind CONFIG_EXPERT as well, just as SM
On 12/10/2014 11:05 AM, Linus Torvalds wrote:
> On Tue, Dec 9, 2014 at 6:08 AM, Thomas Gleixner wrote:
> Why would I want to enable this in my kernel when there are no actual
> CPU's out yet that support it? And even when there are, why would I do
> it if the CPU I have doesn't support it?
There'
On Wed, Dec 10, 2014 at 11:41 AM, Dave Hansen
wrote:
>
> But, this is the kind of option that we want to be *sure* is enabled
> unless folks know exactly what they are doing, so we should probably
> hide it behind CONFIG_EXPERT as well, just as SMEP is.
I disagree.
SMEP doesn't have any performa
On 12/10/2014 11:05 AM, Linus Torvalds wrote:
> Why would I want to enable this in my kernel when there are no actual
> CPU's out yet that support it? And even when there are, why would I do
> it if the CPU I have doesn't support it?
For folks that build their own kernels and know what CPU they ha
On Tue, Dec 9, 2014 at 6:08 AM, Thomas Gleixner wrote:
>
>git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-mpx-for-linus
So I've pulled this (not pushed out yet, I've done all the
allmodconfig builds, but I want to reboot into this all too), but I'm
not entirely sure I'm happy ab
Linus,
please pull the latest x86-mpx-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-mpx-for-linus
This enables support for x86 MPX:
MPX is a new debug feature for bound checking in user space. It
requires kernel support to handle the bound tables
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