LU-9859 tracefile: convert list_for_each_entry_safe() to while(!list_empty())

[fs/lustre-release.git] / libcfs / libcfs / libcfs_mem.c

diff --git a/libcfs/libcfs/libcfs_mem.c b/libcfs/libcfs/libcfs_mem.c
index 95df0d7..15542bb 100644 (file)
--- a/libcfs/libcfs/libcfs_mem.c
+++ b/libcfs/libcfs/libcfs_mem.c
@@ -22,7 +22,7 @@
  */
 /*
  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ * Copyright (c) 2012, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -31,12 +31,11 @@
  * Author: liang@whamcloud.com
  */
 
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
 #define DEBUG_SUBSYSTEM S_LNET
 
+#include <linux/workqueue.h>
 #include <libcfs/libcfs.h>
+#include <lustre_compat.h>
 
 struct cfs_var_array {
        unsigned int            va_count;       /* # of buffers */
@@ -90,7 +89,7 @@ cfs_percpt_alloc(struct cfs_cpt_table *cptab, unsigned int size)
        if (arr == NULL)
                return NULL;
 
-       arr->va_size    = size = CFS_L1_CACHE_ALIGN(size);
+       arr->va_size    = size = L1_CACHE_ALIGN(size);
        arr->va_count   = count;
        arr->va_cptab   = cptab;
 
@@ -122,36 +121,6 @@ cfs_percpt_number(void *vars)
 EXPORT_SYMBOL(cfs_percpt_number);
 
 /*
- * return memory block shadowed from current CPU
- */
-void *
-cfs_percpt_current(void *vars)
-{
-       struct cfs_var_array *arr;
-       int    cpt;
-
-       arr = container_of(vars, struct cfs_var_array, va_ptrs[0]);
-       cpt = cfs_cpt_current(arr->va_cptab, 0);
-       if (cpt < 0)
-               return NULL;
-
-       return arr->va_ptrs[cpt];
-}
-EXPORT_SYMBOL(cfs_percpt_current);
-
-void *
-cfs_percpt_index(void *vars, int idx)
-{
-       struct cfs_var_array *arr;
-
-       arr = container_of(vars, struct cfs_var_array, va_ptrs[0]);
-
-       LASSERT(idx >= 0 && idx < arr->va_count);
-       return arr->va_ptrs[idx];
-}
-EXPORT_SYMBOL(cfs_percpt_index);
-
-/*
  * free variable array, see more detail in cfs_array_alloc
  */
 void
@@ -203,3 +172,58 @@ cfs_array_alloc(int count, unsigned int size)
        return (void *)&arr->va_ptrs[0];
 }
 EXPORT_SYMBOL(cfs_array_alloc);
+
+/*
+ * This is opencoding of vfree_atomic from Linux kernel added in 4.10 with
+ * minimum changes needed to work on older kernels too.
+ */
+
+#ifndef llist_for_each_safe
+#define llist_for_each_safe(pos, n, node)                       \
+        for ((pos) = (node); (pos) && ((n) = (pos)->next, true); (pos) = (n))
+#endif
+
+struct vfree_deferred {
+       struct llist_head list;
+       struct work_struct wq;
+};
+static DEFINE_PER_CPU(struct vfree_deferred, vfree_deferred);
+
+static void free_work(struct work_struct *w)
+{
+       struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq);
+       struct llist_node *t, *llnode;
+
+       llist_for_each_safe(llnode, t, llist_del_all(&p->list))
+               vfree((void *)llnode);
+}
+
+void libcfs_vfree_atomic(const void *addr)
+{
+       struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
+
+       if (!addr)
+               return;
+
+       if (llist_add((struct llist_node *)addr, &p->list))
+               schedule_work(&p->wq);
+}
+EXPORT_SYMBOL(libcfs_vfree_atomic);
+
+void __init init_libcfs_vfree_atomic(void)
+{
+       int i;
+
+       for_each_possible_cpu(i) {
+               struct vfree_deferred *p;
+
+               p = &per_cpu(vfree_deferred, i);
+               init_llist_head(&p->list);
+               INIT_WORK(&p->wq, free_work);
+       }
+}
+
+void __exit exit_libcfs_vfree_atomic(void)
+{
+       flush_scheduled_work();
+}