Messages in this thread | | | Date | Wed, 27 Feb 2013 14:55:11 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] Consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECK |
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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.
-hpa
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