Shawn Guo wrote:
There is an issue reported on imx6q restart function. The issue is only
seen with the image building ARMv7 and ARMv6 together, where cpu_relax()
is define to do dmb. It's been root-caused by Russell as below.
Russell King - ARM Linux wrote:
I suspect having this dmb inside cpu_relax() is flooding the
interconnects with traffic, which then prevents other CPUs getting
a look-in (maybe there's no fairness when it comes to dmb's.
Fix the issue by insert a few NOPs into cpu_relax() where doing dmb.
Tested-by: Hui Wang <[email protected]>
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