[PATCH 2/2] vmalloc: rename llist field in vmap_area

[Igor Stoppa]

The vmap_area structure has a field of type struct llist_node, named
purge_list and is used when performing lazy purge of the area.

Such field is left unused during the actual utilization of the
structure.

This patch renames the field to a more generic "area_list", to allow for
utilization outside of the purging phase.

Since the purging happens after the vmap_area is dismissed, its use is
mutually exclusive with any use performed while the area is allocated.

Signed-off-by: Igor Stoppa <igor.sto...@huawei.com>
---
 include/linux/vmalloc.h | 2 +-
 mm/vmalloc.c            | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 1e5d8c392f15..2d07dfef3cfd 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -47,7 +47,7 @@ struct vmap_area {
        unsigned long flags;
        struct rb_node rb_node;         /* address sorted rbtree */
        struct list_head list;          /* address sorted list */
-       struct llist_node purge_list;    /* "lazy purge" list */
+       struct llist_node area_list;    /* generic list of areas */
        struct vm_struct *vm;
        struct rcu_head rcu_head;
 };
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 61a1ca22b0f6..1bb2233bb262 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -682,7 +682,7 @@ static bool __purge_vmap_area_lazy(unsigned long start, 
unsigned long end)
        lockdep_assert_held(&vmap_purge_lock);
 
        valist = llist_del_all(&vmap_purge_list);
-       llist_for_each_entry(va, valist, purge_list) {
+       llist_for_each_entry(va, valist, area_list) {
                if (va->va_start < start)
                        start = va->va_start;
                if (va->va_end > end)
@@ -696,7 +696,7 @@ static bool __purge_vmap_area_lazy(unsigned long start, 
unsigned long end)
        flush_tlb_kernel_range(start, end);
 
        spin_lock(&vmap_area_lock);
-       llist_for_each_entry_safe(va, n_va, valist, purge_list) {
+       llist_for_each_entry_safe(va, n_va, valist, area_list) {
                int nr = (va->va_end - va->va_start) >> PAGE_SHIFT;
 
                __free_vmap_area(va);
@@ -743,7 +743,7 @@ static void free_vmap_area_noflush(struct vmap_area *va)
                                    &vmap_lazy_nr);
 
        /* After this point, we may free va at any time */
-       llist_add(&va->purge_list, &vmap_purge_list);
+       llist_add(&va->area_list, &vmap_purge_list);
 
        if (unlikely(nr_lazy > lazy_max_pages()))
                try_purge_vmap_area_lazy();
-- 
2.14.1