unlikely compiler flag propagation

[Anupam Kapoor]

>>>>> [2015-02-19T00:08:01+0530]: "Nicholas Mc Guire" (nicholas-mcguire):
 nicholas-mcguire> On Wed, 18 Feb 2015, Greg KH wrote:
,----[ greg-kh ]
| As proof of this, there was a test of the kernel a year or so ago that
| measured the placement of the existing likely/unlikely markers in the
| kernel and 90% of the usages were wrong and actually slowed down the
| processor.
`----

,----[ nicholas-mcguire ]
| interesting - would you have a reference to some talk/paper/data/... ?
`----

couple of 'slightly' oldish posts:
       http://blog.man7.org/2012/10/how-much-do-builtinexpect-likely-and.html and
       http://thread.gmane.org/gmane.linux.kernel/1072767

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thanks
anupam