(catching up on old email) On Tue, Mar 18, 2014 at 07:35:59AM +0000, Jianguo Wu wrote: > Cloud you please take a look at this? [...] > On 2014/2/17 15:05, Jianguo Wu wrote: > > When enable LPAE and big-endian in a hisilicon board, while specify > > mem=384M mem=512M@7680M, will get bad page state: > > > > Freeing unused kernel memory: 180K (c0466000 - c0493000) > > BUG: Bad page state in process init pfn:fa442 > > page:c7749840 count:0 mapcount:-1 mapping: (null) index:0x0 > > page flags: 0x40000400(reserved) > > Modules linked in: > > CPU: 0 PID: 1 Comm: init Not tainted 3.10.27+ #66 > > [<c000f5f0>] (unwind_backtrace+0x0/0x11c) from [<c000cbc4>] (show_stack+0x10/0x14) > > [<c000cbc4>] (show_stack+0x10/0x14) from [<c009e448>] (bad_page+0xd4/0x104) > > [<c009e448>] (bad_page+0xd4/0x104) from [<c009e520>] (free_pages_prepare+0xa8/0x14c) > > [<c009e520>] (free_pages_prepare+0xa8/0x14c) from [<c009f8ec>] (free_hot_cold_page+0x18/0xf0) > > [<c009f8ec>] (free_hot_cold_page+0x18/0xf0) from [<c00b5444>] (handle_pte_fault+0xcf4/0xdc8) > > [<c00b5444>] (handle_pte_fault+0xcf4/0xdc8) from [<c00b6458>] (handle_mm_fault+0xf4/0x120) > > [<c00b6458>] (handle_mm_fault+0xf4/0x120) from [<c0013754>] (do_page_fault+0xfc/0x354) > > [<c0013754>] (do_page_fault+0xfc/0x354) from [<c0008400>] (do_DataAbort+0x2c/0x90) > > [<c0008400>] (do_DataAbort+0x2c/0x90) from [<c0008fb4>] (__dabt_usr+0x34/0x40) [...] > > The bug is happened in cpu_v7_set_pte_ext(ptep, pte): > > when pte is 64-bit, for little-endian, will store low 32-bit in r2, > > high 32-bit in r3; for big-endian, will store low 32-bit in r3, > > high 32-bit in r2, this will cause wrong pfn stored in pte, > > so we should exchange r2 and r3 for big-endian. I believe that Marc (added to CC) has been running LPAE-enabled, big-endian KVM guests without any issues, so it seems unlikely that we're storing the PTEs backwards. Can you check the configuration of SCTLR.EE? Will -- 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>