On Wed, Nov 09, 2022 at 11:35:34AM +0800, Baoquan He wrote: > Currently, vread() can read out vmalloc areas which is associated with > a vm_struct. While this doesn't work for areas created by vm_map_ram() > interface because it doesn't allocate a vm_struct. Then in vread(), > these areas will be skipped. > > Here, add a new function vb_vread() to read out areas managed by > vmap_block specifically. Then recognize vm_map_ram areas via vmap->flags > and handle them respectively. i don't understand how this deals with the original problem identified, that the vread() can race with an unmap.
