On Thu, 26 Jan 2017 14:44:15 -0700 Toshi Kani <toshi.kani@xxxxxxx> wrote: > Reading a sysfs memoryN/valid_zones file leads to the following > oops when the first page of a range is not backed by struct page. > show_valid_zones() assumes that 'start_pfn' is always valid for > page_zone(). > > BUG: unable to handle kernel paging request at ffffea017a000000 > IP: show_valid_zones+0x6f/0x160 > > Since test_pages_in_a_zone() already checks holes, extend this > function to return 'valid_start' and 'valid_end' for a given range. > show_valid_zones() then proceeds with the valid range. This doesn't apply to current mainline due to changes in zone_can_shift(). Please redo and resend. Please also update the changelog to provide sufficient information for others to decide which kernel(s) need the fix. In particular: under what circumstances will it occur? On real machines which real people own? -- 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>
