i think this use to diff kernel space or user space or iomem like cpu ring 0 to ring 3. include/Linux/compiler.h: #ifdef __CHECKER__ # define __user __attribute__((noderef, address_space(1))) # define __kernel /* default address space */ # define __iomem __attribute__((noderef, address_space(2))) ....... BRs lin 2009/4/23 Arjun Joshi <arjun.joshi@xxxxxxxxxxxxxx>: > Hi, > > I recently came across the below #define > > # define __iomem __attribute__((noderef, address_space(2))) > > Browsing the internet I could find the following detail: > > "iomem" means two separate things: it means that sparse should complain > if the pointer is ever dereferenced (it's a "noderef" pointer) directly, > and it's in "address space 2" as opposed to the normal address space (0). > > My query : what does this address_space(2) or address_space(0) mean? > > Thanks in advance, > Arjun > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
