On Wed, 1 Aug 2012, Glauber Costa wrote: > I've audited all users of get_page() in the drivers/ directory for > patterns like this. In general, they kmalloc something like a table of > entries, and then get_page() the entries. The entries are either user > pages, pages allocated by the page allocator, or physical addresses > through their pfn (in 2 cases from the vga ones...) > > I took a look about some other instances where virt_to_page occurs > together with kmalloc as well, and they all seem to fall in the same > category. The case that was notorious in the past was a scsi control structure allocated from slab that was then written to the device via DMA. And it was not on x86 but some esoteric platform (powerpc?), A reference to the discussion of this issue in 2007: http://lkml.indiana.edu/hypermail/linux/kernel/0706.3/0424.html -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>