Blackfin: SMP: flush CoreB cache when shutting down
When CoreB wakes up, it needs to read variables that CoreA might have modified, and might be in CoreB's cache. So kill CoreB's cache before going to sleep so that when we wake up, we are in a coherent state. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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