Guo Ren 997153b9a7 csky: Add flush_icache_mm to defer flush icache all ...

Some CPUs don't support icache.va instruction to maintain the whole
smp cores' icache. Using icache.all + IPI casue a lot on performace
and using defer mechanism could reduce the number of calling icache
_flush_all functions.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

2020-02-21 15:43:24 +08:00

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