On Thu, Jan 06, 2022 at 06:42:57AM +0000, lizhijian@xxxxxxxxxxx wrote:
>
>
> On 06/01/2022 08:28, Jason Gunthorpe wrote:
> > On Tue, Dec 28, 2021 at 04:07:15PM +0800, Li Zhijian wrote:
> >> + while (length > 0) {
> >> + va = (u8 *)(uintptr_t)buf->addr + offset;
> >> + bytes = buf->size - offset;
> >> +
> >> + if (bytes > length)
> >> + bytes = length;
> >> +
> >> + arch_wb_cache_pmem(va, bytes);
> > So why did we need to check that the va was pmem to call this?
> Sorry, i didn't get you.
>
> I didn't check whether va is pmem, since only MR registered with PERSISTENCE(only pmem can
> register this access flag) can reach here.
Yes, that is what I mean, why did we need to check anything to call
this API - it should work on any CPU mapped address.
Jason
