Re: [question] Panic in dax_writeback_one

[chenjun (AM)]

在 2021/3/11 20:20, Matthew Wilcox 写道:
> On Thu, Mar 11, 2021 at 07:48:25AM +0000, chenjun (AM) wrote:
>> static int dax_writeback_one(struct xa_state *xas, struct dax_device
>> *dax_dev, struct address_space *mapping, void *entry)
>> ----dax_flush(dax_dev, page_address(pfn_to_page(pfn)), count * PAGE_SIZE);
>> The pfn is returned by the driver. In my case, the pfn does not have
>> struct page. so pfn_to_page(pfn) return a wrong address.
> 
> I wasn't involved, but I think the right solution here is simply to
> replace page_address(pfn_to_page(pfn)) with pfn_to_virt(pfn).  I don't
> know why Dan decided to do this in the more complicated way.
> 

Thanks Mattherw

I think pfn_to_virt could not work in my case. Because of the pfn is not 
in memory block.

-- 
Regards
Chen Jun