On Tue, Oct 18, 2011 at 1:34 AM, StephanT <stman937-linewbie@xxxxxxxxx> wrote: > Hi all, > In a kernel module is there a way to test if an address range has > been already mapped by the kernel or not. > Ex: (on a PC with the latest kernel) > - an access to physical 0xC0000000 will return the value at this address > - an access to physical 0x00100000 will have the kernel kill the > module/application > using the module. Dmesg: BUG: unable to handle kernel paging > request at 00100000. > > How can I test this condition before dereferencing the address. > Thanks, > Stephan. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > When you say an access to physical address, how are you managing to access the physical address directly? _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
