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: error: C++ style comments are not allowed in ISO C90
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
^
error: (this will be reported only once per input file)
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Remove shareable bit for ordering barrier, just keep ordering
in current hart is enough for SMP. Using three continuous
sync.is as PTW barrier to prevent speculative PTW in 860
microarchitecture.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
The mb() is the superset of dma and smp. Using bar.xxx to implement
mb() will cause problem when sync data with dma device, becasue
bar.xxx couldn't guarantee bus transactions finished at outside bus
level.
We must use sync.s instead of bar.xxx for dma data synchronization
and it will guarantee retirement after getting the bus bresponse.
Changes for V2:
- Use sync.s for all mb, rmb, wmb, dma_wmb, dma_rmb.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
