On Mon, Apr 06, 2020 at 11:08:46PM -0400, Yan Zhao wrote: > hi > we were removing this code. see > https://lore.kernel.org/kvm/20200313031109.7989-1-yan.y.zhao@xxxxxxxxx/ This didn't make 5.7-rc1. > The implementation of vfio_dma_rw() has been in vfio next tree. > https://github.com/awilliam/linux-vfio/commit/8d46c0cca5f4dc0538173d62cd36b1119b5105bc This made 5.7-rc1, so I'll update the series to take it into account. T > in vfio_dma_rw(), we still use > bool kthread = current->mm == NULL. > because if current->mm != NULL and current->flags & PF_KTHREAD, instead > of calling use_mm(), we first check if (current->mm == mm) and allow copy_to_user() if it's true. > > Do you think it's all right? I can't think of another way for a kernel thread to have a mm indeed.
