On 11/16/2012 02:45 PM, Steven Rostedt wrote:
#define __pa(x) __phys_addr((unsigned long)(x))
#define __pa_symbol(x) __pa(__phys_reloc_hide((unsigned long)(x)))
I'm confused. __pa_symbol() just calls __pa() with some macro magic to
its parameter. How is this a performance improvement?
One of the earlier patches in this series changes __pa_symbol() to avoid
the conditional hidden inside __phys_addr(), since by definition a
symbol can only be on one side of that branch.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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