On Mon, Oct 5, 2020 at 6:45 AM Christoph Hellwig hch@infradead.org wrote:

How is this going to deal with VIVT caches?

Hrm. That's a good question. I'm not sure I totally have my head around it but, I guess we could make sure to call invalidate_kernel_vmap_range() in begin_cpu_access() and flush_kernel_vmap_range() in end_cpu_access() rather then exiting out early as we do now?

Unless you have better guidance?

Worse case we could check CONFIG_CPU_CACHE_VIVT and not register the system-uncached heap.

thanks -john