From: Stephen Boyd
Date: Wed Feb 27 2013 - 18:19:35 EST

On 02/27/13 14:55, H. Peter Anvin wrote:
> On 02/27/2013 02:52 PM, Stephen Boyd wrote:
>> On 02/27/13 14:19, H. Peter Anvin wrote:
>>> On 02/27/2013 12:42 PM, Stephen Boyd wrote:
>>>>> It's fine to do your patch as a first step though, which would not
>>>>> change the behavior.
>>>> A lot of arches seem to not want to enable it because false positives
>>>> are everywhere. It really depends on how good the compiler is at doing
>>>> constant propagation and dead code removal.
>>> Although some of the cases I have seen being flagged as "false
>>> positives" have been real bugs.
>> There were so many false-positives on x86_64 that Andrew eventually
>> dropped my patch to add support for this option to the copy_from_user()
>> function there.
> I would probably have taken it, especially if it came with more x86-64
> to i386 unification.
> It's an option, though.

You acked the patch[1]. Will you pick it up?


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