diff options
Diffstat (limited to 'mm/memory-failure.c')
-rw-r--r-- | mm/memory-failure.c | 80 |
1 files changed, 48 insertions, 32 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 78f5f26..2fcca6b 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -184,8 +184,8 @@ static int kill_proc(struct task_struct *t, unsigned long addr, int trapno, struct siginfo si; int ret; - pr_err("MCE %#lx: Killing %s:%d due to hardware memory corruption\n", - pfn, t->comm, t->pid); + pr_err("Memory failure: %#lx: Killing %s:%d due to hardware memory corruption\n", + pfn, t->comm, t->pid); si.si_signo = SIGBUS; si.si_errno = 0; si.si_addr = (void *)addr; @@ -208,7 +208,7 @@ static int kill_proc(struct task_struct *t, unsigned long addr, int trapno, ret = send_sig_info(SIGBUS, &si, t); /* synchronous? */ } if (ret < 0) - pr_info("MCE: Error sending signal to %s:%d: %d\n", + pr_info("Memory failure: Error sending signal to %s:%d: %d\n", t->comm, t->pid, ret); return ret; } @@ -289,7 +289,7 @@ static void add_to_kill(struct task_struct *tsk, struct page *p, } else { tk = kmalloc(sizeof(struct to_kill), GFP_ATOMIC); if (!tk) { - pr_err("MCE: Out of memory while machine check handling\n"); + pr_err("Memory failure: Out of memory while machine check handling\n"); return; } } @@ -303,7 +303,7 @@ static void add_to_kill(struct task_struct *tsk, struct page *p, * a SIGKILL because the error is not contained anymore. */ if (tk->addr == -EFAULT) { - pr_info("MCE: Unable to find user space address %lx in %s\n", + pr_info("Memory failure: Unable to find user space address %lx in %s\n", page_to_pfn(p), tsk->comm); tk->addr_valid = 0; } @@ -334,7 +334,7 @@ static void kill_procs(struct list_head *to_kill, int forcekill, int trapno, * signal and then access the memory. Just kill it. */ if (fail || tk->addr_valid == 0) { - pr_err("MCE %#lx: forcibly killing %s:%d because of failure to unmap corrupted page\n", + pr_err("Memory failure: %#lx: forcibly killing %s:%d because of failure to unmap corrupted page\n", pfn, tk->tsk->comm, tk->tsk->pid); force_sig(SIGKILL, tk->tsk); } @@ -347,7 +347,7 @@ static void kill_procs(struct list_head *to_kill, int forcekill, int trapno, */ else if (kill_proc(tk->tsk, tk->addr, trapno, pfn, page, flags) < 0) - pr_err("MCE %#lx: Cannot send advisory machine check signal to %s:%d\n", + pr_err("Memory failure: %#lx: Cannot send advisory machine check signal to %s:%d\n", pfn, tk->tsk->comm, tk->tsk->pid); } put_task_struct(tk->tsk); @@ -559,7 +559,7 @@ static int me_kernel(struct page *p, unsigned long pfn) */ static int me_unknown(struct page *p, unsigned long pfn) { - pr_err("MCE %#lx: Unknown page state\n", pfn); + pr_err("Memory failure: %#lx: Unknown page state\n", pfn); return MF_FAILED; } @@ -604,11 +604,12 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn) if (mapping->a_ops->error_remove_page) { err = mapping->a_ops->error_remove_page(mapping, p); if (err != 0) { - pr_info("MCE %#lx: Failed to punch page: %d\n", + pr_info("Memory failure: %#lx: Failed to punch page: %d\n", pfn, err); } else if (page_has_private(p) && !try_to_release_page(p, GFP_NOIO)) { - pr_info("MCE %#lx: failed to release buffers\n", pfn); + pr_info("Memory failure: %#lx: failed to release buffers\n", + pfn); } else { ret = MF_RECOVERED; } @@ -620,7 +621,8 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn) if (invalidate_inode_page(p)) ret = MF_RECOVERED; else - pr_info("MCE %#lx: Failed to invalidate\n", pfn); + pr_info("Memory failure: %#lx: Failed to invalidate\n", + pfn); } return ret; } @@ -833,7 +835,7 @@ static void action_result(unsigned long pfn, enum mf_action_page_type type, { trace_memory_failure_event(pfn, type, result); - pr_err("MCE %#lx: recovery action for %s: %s\n", + pr_err("Memory failure: %#lx: recovery action for %s: %s\n", pfn, action_page_types[type], action_name[result]); } @@ -849,7 +851,7 @@ static int page_action(struct page_state *ps, struct page *p, if (ps->action == me_swapcache_dirty && result == MF_DELAYED) count--; if (count != 0) { - pr_err("MCE %#lx: %s still referenced by %d users\n", + pr_err("Memory failure: %#lx: %s still referenced by %d users\n", pfn, action_page_types[ps->type], count); result = MF_FAILED; } @@ -882,13 +884,22 @@ int get_hwpoison_page(struct page *page) * tries to touch the "partially handled" page. */ if (!PageAnon(head)) { - pr_err("MCE: %#lx: non anonymous thp\n", + pr_err("Memory failure: %#lx: non anonymous thp\n", page_to_pfn(page)); return 0; } } - return get_page_unless_zero(head); + if (get_page_unless_zero(head)) { + if (head == compound_head(page)) + return 1; + + pr_info("Memory failure: %#lx cannot catch tail\n", + page_to_pfn(page)); + put_page(head); + } + + return 0; } EXPORT_SYMBOL_GPL(get_hwpoison_page); @@ -923,12 +934,13 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn, return SWAP_SUCCESS; if (PageKsm(p)) { - pr_err("MCE %#lx: can't handle KSM pages.\n", pfn); + pr_err("Memory failure: %#lx: can't handle KSM pages.\n", pfn); return SWAP_FAIL; } if (PageSwapCache(p)) { - pr_err("MCE %#lx: keeping poisoned page in swap cache\n", pfn); + pr_err("Memory failure: %#lx: keeping poisoned page in swap cache\n", + pfn); ttu |= TTU_IGNORE_HWPOISON; } @@ -946,7 +958,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn, } else { kill = 0; ttu |= TTU_IGNORE_HWPOISON; - pr_info("MCE %#lx: corrupted page was clean: dropped without side effects\n", + pr_info("Memory failure: %#lx: corrupted page was clean: dropped without side effects\n", pfn); } } @@ -964,7 +976,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn, ret = try_to_unmap(hpage, ttu); if (ret != SWAP_SUCCESS) - pr_err("MCE %#lx: failed to unmap page (mapcount=%d)\n", + pr_err("Memory failure: %#lx: failed to unmap page (mapcount=%d)\n", pfn, page_mapcount(hpage)); /* @@ -1032,14 +1044,16 @@ int memory_failure(unsigned long pfn, int trapno, int flags) panic("Memory failure from trap %d on page %lx", trapno, pfn); if (!pfn_valid(pfn)) { - pr_err("MCE %#lx: memory outside kernel control\n", pfn); + pr_err("Memory failure: %#lx: memory outside kernel control\n", + pfn); return -ENXIO; } p = pfn_to_page(pfn); orig_head = hpage = compound_head(p); if (TestSetPageHWPoison(p)) { - pr_err("MCE %#lx: already hardware poisoned\n", pfn); + pr_err("Memory failure: %#lx: already hardware poisoned\n", + pfn); return 0; } @@ -1104,9 +1118,11 @@ int memory_failure(unsigned long pfn, int trapno, int flags) if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) { unlock_page(hpage); if (!PageAnon(hpage)) - pr_err("MCE: %#lx: non anonymous thp\n", pfn); + pr_err("Memory failure: %#lx: non anonymous thp\n", + pfn); else - pr_err("MCE: %#lx: thp split failed\n", pfn); + pr_err("Memory failure: %#lx: thp split failed\n", + pfn); if (TestClearPageHWPoison(p)) num_poisoned_pages_sub(nr_pages); put_hwpoison_page(p); @@ -1170,7 +1186,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags) * unpoison always clear PG_hwpoison inside page lock */ if (!PageHWPoison(p)) { - pr_err("MCE %#lx: just unpoisoned\n", pfn); + pr_err("Memory failure: %#lx: just unpoisoned\n", pfn); num_poisoned_pages_sub(nr_pages); unlock_page(hpage); put_hwpoison_page(hpage); @@ -1387,25 +1403,25 @@ int unpoison_memory(unsigned long pfn) page = compound_head(p); if (!PageHWPoison(p)) { - unpoison_pr_info("MCE: Page was already unpoisoned %#lx\n", + unpoison_pr_info("Unpoison: Page was already unpoisoned %#lx\n", pfn, &unpoison_rs); return 0; } if (page_count(page) > 1) { - unpoison_pr_info("MCE: Someone grabs the hwpoison page %#lx\n", + unpoison_pr_info("Unpoison: Someone grabs the hwpoison page %#lx\n", pfn, &unpoison_rs); return 0; } if (page_mapped(page)) { - unpoison_pr_info("MCE: Someone maps the hwpoison page %#lx\n", + unpoison_pr_info("Unpoison: Someone maps the hwpoison page %#lx\n", pfn, &unpoison_rs); return 0; } if (page_mapping(page)) { - unpoison_pr_info("MCE: the hwpoison page has non-NULL mapping %#lx\n", + unpoison_pr_info("Unpoison: the hwpoison page has non-NULL mapping %#lx\n", pfn, &unpoison_rs); return 0; } @@ -1416,7 +1432,7 @@ int unpoison_memory(unsigned long pfn) * In such case, we yield to memory_failure() and make unpoison fail. */ if (!PageHuge(page) && PageTransHuge(page)) { - unpoison_pr_info("MCE: Memory failure is now running on %#lx\n", + unpoison_pr_info("Unpoison: Memory failure is now running on %#lx\n", pfn, &unpoison_rs); return 0; } @@ -1431,13 +1447,13 @@ int unpoison_memory(unsigned long pfn) * to the end. */ if (PageHuge(page)) { - unpoison_pr_info("MCE: Memory failure is now running on free hugepage %#lx\n", + unpoison_pr_info("Unpoison: Memory failure is now running on free hugepage %#lx\n", pfn, &unpoison_rs); return 0; } if (TestClearPageHWPoison(p)) num_poisoned_pages_dec(); - unpoison_pr_info("MCE: Software-unpoisoned free page %#lx\n", + unpoison_pr_info("Unpoison: Software-unpoisoned free page %#lx\n", pfn, &unpoison_rs); return 0; } @@ -1450,7 +1466,7 @@ int unpoison_memory(unsigned long pfn) * the free buddy page pool. */ if (TestClearPageHWPoison(page)) { - unpoison_pr_info("MCE: Software-unpoisoned page %#lx\n", + unpoison_pr_info("Unpoison: Software-unpoisoned page %#lx\n", pfn, &unpoison_rs); num_poisoned_pages_sub(nr_pages); freeit = 1; |