Blackfin: SMP: fix cache flush loop
The recent commit (10774912647781) wasn't entirely correct. While it fixed some issues, it introduced others. So pull in the fixes from the public cache flush functions, and document why we need to call things directly ourselves. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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