mm: change anon_vma linking to fix multi-process server scalability issue

[cascardo/linux.git] / mm / memory-failure.c

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6a0466e..d1f3351 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -52,6 +52,8 @@ int sysctl_memory_failure_recovery __read_mostly = 1;
 
 atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0);
 
+#if defined(CONFIG_HWPOISON_INJECT) || defined(CONFIG_HWPOISON_INJECT_MODULE)
+
 u32 hwpoison_filter_enable = 0;
 u32 hwpoison_filter_dev_major = ~0U;
 u32 hwpoison_filter_dev_minor = ~0U;
@@ -164,6 +166,13 @@ int hwpoison_filter(struct page *p)
 
        return 0;
 }
+#else
+int hwpoison_filter(struct page *p)
+{
+       return 0;
+}
+#endif
+
 EXPORT_SYMBOL_GPL(hwpoison_filter);
 
 /*
@@ -374,9 +383,12 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
        if (av == NULL) /* Not actually mapped anymore */
                goto out;
        for_each_process (tsk) {
+               struct anon_vma_chain *vmac;
+
                if (!task_early_kill(tsk))
                        continue;
-               list_for_each_entry (vma, &av->head, anon_vma_node) {
+               list_for_each_entry(vmac, &av->head, same_anon_vma) {
+                       vma = vmac->vma;
                        if (!page_mapped_in_vma(page, vma))
                                continue;
                        if (vma->vm_mm == tsk->mm)