Em 25-11-2013 14:26, Daniel Borkmann escreveu:
On 11/25/2013 04:59 PM, James Yonan wrote:This approach using __asm__ ("" : "=r" (var) : "0" (var)) to try to prevent compiler optimizations of var is interesting. I like the fact that it's finer-grained than -Os and doesn't preclude inlining.Agreed. This looks much better than the Makefile workaround. Do we have a hard guarantee that in future, this will not be detected and optimized away by the compiler?
That guarantee is something only the compiler people can give you. But given that RELOC_HIDE will break if that ever changes, and there are other constructs depending on the optimization-blocking behavior of inline assembly (like the many kinds of barriers in the kernel), I am not worried about that.
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