From: Stephen Boyd
Date: Wed Feb 27 2013 - 17:53:01 EST

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.

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