On 2023-02-28 4:37 p.m., Matthew Wilcox (Oracle) wrote:
Add set_ptes(), update_mmu_cache_range(), flush_dcache_folio() and flush_icache_pages(). Change the PG_arch_1 (aka PG_dcache_dirty) flag from being per-page to per-folio.
I have tested this change on rp3440 at mainline commit e492250d5252635b6c97d52eddf2792ec26f1ec1 and c8000 at mainline commit ee3f96b164688dae21e2466a57f2e806b64e8a37. So far, I haven't seen an issues on c8000. On rp3440, I saw the following: _swap_info_get: Unused swap offset entry 00000320 BUG: Bad page map in process buildd pte:00032100 pmd:003606c3 addr:0000000000482000 vm_flags:00100077 anon_vma:0000000066f61340 mapping:0000000000000000 index:482 file:(null) fault:0x0 mmap:0x0 read_folio:0x0 CPU: 0 PID: 6813 Comm: buildd Not tainted 6.2.0+ #1 Hardware name: 9000/800/rp3440 Backtrace: [<000000004020af50>] show_stack+0x70/0x90 [<0000000040b7d408>] dump_stack_lvl+0xd8/0x128 [<0000000040b7d48c>] dump_stack+0x34/0x48 [<00000000404513a4>] print_bad_pte+0x24c/0x318 [<00000000404560dc>] zap_pte_range+0x8d4/0x958 [<0000000040456398>] unmap_page_range+0x1d8/0x490 [<000000004045681c>] unmap_vmas+0x10c/0x1a8 [<0000000040466330>] exit_mmap+0x198/0x4a0 [<0000000040235cbc>] mmput+0x114/0x2a8 [<0000000040244e90>] do_exit+0x4e0/0xc68 [<0000000040245938>] do_group_exit+0x68/0x128 [<000000004025967c>] get_signal+0xae4/0xb60 [<000000004021a570>] do_signal+0x50/0x228 [<000000004021ab38>] do_notify_resume+0x68/0x150 [<00000000402030b4>] intr_check_sig+0x38/0x3c Disabling lock debugging due to kernel taint _swap_info_get: Unused swap offset entry 000003a9 BUG: Bad page map in process buildd pte:0003a940 pmd:003606c3 addr:0000000000523000 vm_flags:00100077 anon_vma:0000000066f61340 mapping:0000000000000000 index:523 file:(null) fault:0x0 mmap:0x0 read_folio:0x0 CPU: 2 PID: 6813 Comm: buildd Tainted: G B 6.2.0+ #1 Hardware name: 9000/800/rp3440 Backtrace: [<000000004020af50>] show_stack+0x70/0x90 [<0000000040b7d408>] dump_stack_lvl+0xd8/0x128 [<0000000040b7d48c>] dump_stack+0x34/0x48 [<00000000404513a4>] print_bad_pte+0x24c/0x318 [<00000000404560dc>] zap_pte_range+0x8d4/0x958 [<0000000040456398>] unmap_page_range+0x1d8/0x490 [<000000004045681c>] unmap_vmas+0x10c/0x1a8 [<0000000040466330>] exit_mmap+0x198/0x4a0 [<0000000040235cbc>] mmput+0x114/0x2a8 [<0000000040244e90>] do_exit+0x4e0/0xc68 [<0000000040245938>] do_group_exit+0x68/0x128 [<000000004025967c>] get_signal+0xae4/0xb60 [<000000004021a570>] do_signal+0x50/0x228 [<000000004021ab38>] do_notify_resume+0x68/0x150 [<00000000402030b4>] intr_check_sig+0x38/0x3c [...] pagefault_out_of_memory: 1158973 callbacks suppressed Huh VM_FAULT_OOM leaked out to the #PF handler. Retrying PF Huh VM_FAULT_OOM leaked out to the #PF handler. Retrying PF Huh VM_FAULT_OOM leaked out to the #PF handler. Retrying PF Rebooted rp3440. Since then, I haven't seen any more problems. Dave -- John David Anglin dave.anglin@xxxxxxxx
