/* Forcibly offline a page, including killing processes. */ static ssize_t store_hard_offline_page(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ret; u64 pfn; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (strict_strtoull(buf, 0, &pfn) < 0) return -EINVAL; pfn >>= PAGE_SHIFT; ret = __memory_failure(pfn, 0, 0); return ret ? ret : count; }
static int hwpoison_inject(void *data, u64 val) { unsigned long pfn = val; struct page *p; int err; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!hwpoison_filter_enable) goto inject; if (!pfn_valid(pfn)) return -ENXIO; p = pfn_to_page(pfn); /* * This implies unable to support free buddy pages. */ if (!get_page_unless_zero(p)) return 0; if (!PageLRU(p)) shake_page(p, 0); /* * This implies unable to support non-LRU pages. */ if (!PageLRU(p)) return 0; /* * do a racy check with elevated page count, to make sure PG_hwpoison * will only be set for the targeted owner (or on a free page). * We temporarily take page lock for try_get_mem_cgroup_from_page(). * __memory_failure() will redo the check reliably inside page lock. */ lock_page(p); err = hwpoison_filter(p); unlock_page(p); if (err) return 0; inject: printk(KERN_INFO "Injecting memory failure at pfn %lx\n", pfn); return __memory_failure(pfn, 18, MF_COUNT_INCREASED); }