When CONFIG_KERNEL_COHERENCE=y (e.g on the various intel_adsp
platforms under SMP) it's not legal to share stack memory between
CPUs, because the stack is cached, and the L1 cache is incoherent.
The kernel will automatically detect the mistake when the memory
contains a kernel object (spinlock, IPC object, etc...). But here the
test was just passing async buffers into the msgq layer, and nothing
watches that.
The fix is simple: make them static.
Fixes#35857
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
13d3036e37