On Fri, Jan 10, 2020 at 10:58:01AM +0800, Ming Lei wrote: > On Thu, Jan 09, 2020 at 08:18:04AM -0700, Jens Axboe wrote: > > On 1/9/20 12:16 AM, Christoph Hellwig wrote: > > > On Thu, Jan 09, 2020 at 10:03:41AM +0800, Ming Lei wrote: > > >> It has been addressed in: > > >> > > >> https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=block-5.5&id=ecd255974caa45901d0b8fab03626e0a18fbc81a > > > > > > That is probably correct, but still highly suboptimal for most 32-bit > > > architectures where physical addresses are 32 bits wide. To fix that > > > the proper phys_addr_t type should be used. > > > > I'll swap it for phys_addr_t - we used to use dma_address_t or something > > like that, but I missed this type. > > Guenter mentioned that 'page_to_phys(start_page) as well as offset are > sometimes 0'[1]. > > If that(zero page physical address) can happen when phys_addr_t is 32bit, > I guess phys_addr_t may not work too. > > Guener, could you test the patch in link[2] again? > > > [1] https://lore.kernel.org/linux-block/20200108023822.GB28075@ming.t460p/T/#m5862216b960454fc41a85204defbb887983bfd75 > [2] https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=block-5.5&id=b6a89c4a9590663f80486662fe9a9c1f4cee31f4 Loop Guener in. Thanks, Ming
