On Sat, Sep 26, 2020 at 4:14 PM Christoph Hellwig wrote:
>
> On Fri, Sep 25, 2020 at 06:46:22PM +, Tomasz Figa wrote:
> > > +static void *iommu_dma_alloc_noncoherent(struct device *dev, size_t size,
> > > + dma_addr_t *handle, enum dma_data_direction dir, gfp_t gfp)
> > > +{
> > > +
On Fri, Sep 25, 2020 at 06:46:22PM +, Tomasz Figa wrote:
> > +static void *iommu_dma_alloc_noncoherent(struct device *dev, size_t size,
> > + dma_addr_t *handle, enum dma_data_direction dir, gfp_t gfp)
> > +{
> > + if (!gfpflags_allow_blocking(gfp)) {
> > + struct page *pa
On Fri, Sep 25, 2020 at 01:44:41PM -0700, Ralph Campbell wrote:
> error = ___wait_var_event(&page->_refcount,
> - atomic_read(&page->_refcount) == 1,
> + dax_layout_is_idle_page(page),
> TASK_INTERRU
On Fri, Sep 25, 2020 at 01:44:42PM -0700, Ralph Campbell wrote:
> ZONE_DEVICE struct pages have an extra reference count that complicates the
> code for put_page() and several places in the kernel that need to check the
> reference count to see that a page is not being used (gup, compaction,
> migr
