On Tue 02-05-17 15:59:23, Xishi Qiu wrote: > Hi, I use "memtester -p 0x6c80000000000 10G" to test physical address 0x6c80000000000 > Because this physical address is invalid, and valid_mmap_phys_addr_range() > always return 1, so it causes crash. > > My question is that should the user assure the physical address is valid? We already seem to be checking range_is_allowed(). What is your CONFIG_STRICT_DEVMEM setting? The code seems to be rather confusing but my assumption is that you better know what you are doing when mapping this file. > ... > [ 169.147578] ? panic+0x1f1/0x239 > [ 169.150789] oops_end+0xb8/0xd0 > [ 169.153910] pgtable_bad+0x8a/0x95 > [ 169.157294] __do_page_fault+0x3aa/0x4a0 > [ 169.161194] do_page_fault+0x30/0x80 > [ 169.164750] ? do_syscall_64+0x175/0x180 > [ 169.168649] page_fault+0x28/0x30 > > Thanks, > Xishi Qiu -- Michal Hocko SUSE Labs -- 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>
