Re: [PATCH 01/11] x86: Use asm goto to implement bettermodify_and_test() functions

[Andi Kleen]

On Wed, Sep 18, 2013 at 02:02:37PM -0500, H. Peter Anvin wrote:
> Yes, a bit sad.  We allow bracketing with the get/put_user_try/catch blocks, but that is x86-specific.
> 
> I don't think a generic option is possible without compiler support, but it might be possible to do better than we do know.

Letting the compiler do it is a bit risky, because it may open it up for
really large blocks, thus defeating the security advantages.

-Andi
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