mm: unify remaining mem_cont, mem, etc. variable names to memcg

Signed-off-by: Johannes Weiner <jweiner@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 78 insertions, 75 deletions

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index cee3761666f0..b80de520670b 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -54,10 +54,10 @@ extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
                                 gfp_t gfp_mask);
 /* for swap handling */
 extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
-                struct page *page, gfp_t mask, struct mem_cgroup **ptr);
+                struct page *page, gfp_t mask, struct mem_cgroup **memcgp);
 extern void mem_cgroup_commit_charge_swapin(struct page *page,
-                                        struct mem_cgroup *ptr);
-extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);
+                                        struct mem_cgroup *memcg);
+extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg);
 
 extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
                                         gfp_t gfp_mask);
@@ -101,7 +101,7 @@ extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg);
 
 extern int
 mem_cgroup_prepare_migration(struct page *page,
-        struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask);
+        struct page *newpage, struct mem_cgroup **memcgp, gfp_t gfp_mask);
 extern void mem_cgroup_end_migration(struct mem_cgroup *memcg,
         struct page *oldpage, struct page *newpage, bool migration_ok);
 
@@ -186,17 +186,17 @@ static inline int mem_cgroup_cache_charge(struct page *page,
 }
 
 static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
-                struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
+                struct page *page, gfp_t gfp_mask, struct mem_cgroup **memcgp)
 {
         return 0;
 }
 
 static inline void mem_cgroup_commit_charge_swapin(struct page *page,
-                                          struct mem_cgroup *ptr)
+                                          struct mem_cgroup *memcg)
 {
 }
 
-static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
+static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
 {
 }
 
@@ -275,7 +275,7 @@ static inline struct cgroup_subsys_state
 
 static inline int
 mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
-        struct mem_cgroup **ptr, gfp_t gfp_mask)
+        struct mem_cgroup **memcgp, gfp_t gfp_mask)
 {
         return 0;
 }
diff --git a/include/linux/oom.h b/include/linux/oom.h
index 6f9d04a85336..552fba9c7d5a 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -43,7 +43,7 @@ enum oom_constraint {
 extern void compare_swap_oom_score_adj(int old_val, int new_val);
 extern int test_set_oom_score_adj(int new_val);
 
-extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
+extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
                         const nodemask_t *nodemask, unsigned long totalpages);
 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 1afb9954bbf1..1cdd62a2788a 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -158,7 +158,7 @@ static inline void page_dup_rmap(struct page *page)
  * Called from mm/vmscan.c to handle paging out
  */
 int page_referenced(struct page *, int is_locked,
-                        struct mem_cgroup *cnt, unsigned long *vm_flags);
+                        struct mem_cgroup *memcg, unsigned long *vm_flags);
 int page_referenced_one(struct page *, struct vm_area_struct *,
         unsigned long address, unsigned int *mapcount, unsigned long *vm_flags);
 
@@ -236,7 +236,7 @@ int rmap_walk(struct page *page, int (*rmap_one)(struct page *,
 #define anon_vma_link(vma)      do {} while (0)
 
 static inline int page_referenced(struct page *page, int is_locked,
-                                  struct mem_cgroup *cnt,
+                                  struct mem_cgroup *memcg,
                                   unsigned long *vm_flags)
 {
         *vm_flags = 0;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index abb66a2cba65..aeb23933a052 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2844,12 +2844,12 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  */
 int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
                                  struct page *page,
-                                 gfp_t mask, struct mem_cgroup **ptr)
+                                 gfp_t mask, struct mem_cgroup **memcgp)
 {
         struct mem_cgroup *memcg;
         int ret;
 
-        *ptr = NULL;
+        *memcgp = NULL;
 
         if (mem_cgroup_disabled())
                 return 0;
@@ -2867,27 +2867,27 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
         memcg = try_get_mem_cgroup_from_page(page);
         if (!memcg)
                 goto charge_cur_mm;
-        *ptr = memcg;
-        ret = __mem_cgroup_try_charge(NULL, mask, 1, ptr, true);
+        *memcgp = memcg;
+        ret = __mem_cgroup_try_charge(NULL, mask, 1, memcgp, true);
         css_put(&memcg->css);
         return ret;
 charge_cur_mm:
         if (unlikely(!mm))
                 mm = &init_mm;
-        return __mem_cgroup_try_charge(mm, mask, 1, ptr, true);
+        return __mem_cgroup_try_charge(mm, mask, 1, memcgp, true);
 }
 
 static void
-__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
+__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
                                         enum charge_type ctype)
 {
         if (mem_cgroup_disabled())
                 return;
-        if (!ptr)
+        if (!memcg)
                 return;
-        cgroup_exclude_rmdir(&ptr->css);
+        cgroup_exclude_rmdir(&memcg->css);
 
-        __mem_cgroup_commit_charge_lrucare(page, ptr, ctype);
+        __mem_cgroup_commit_charge_lrucare(page, memcg, ctype);
         /*
          * Now swap is on-memory. This means this page may be
          * counted both as mem and swap....double count.
@@ -2897,21 +2897,22 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
          */
         if (do_swap_account && PageSwapCache(page)) {
                 swp_entry_t ent = {.val = page_private(page)};
+                struct mem_cgroup *swap_memcg;
                 unsigned short id;
-                struct mem_cgroup *memcg;
 
                 id = swap_cgroup_record(ent, 0);
                 rcu_read_lock();
-                memcg = mem_cgroup_lookup(id);
-                if (memcg) {
+                swap_memcg = mem_cgroup_lookup(id);
+                if (swap_memcg) {
                         /*
                          * This recorded memcg can be obsolete one. So, avoid
                          * calling css_tryget
                          */
-                        if (!mem_cgroup_is_root(memcg))
-                                res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
-                        mem_cgroup_swap_statistics(memcg, false);
-                        mem_cgroup_put(memcg);
+                        if (!mem_cgroup_is_root(swap_memcg))
+                                res_counter_uncharge(&swap_memcg->memsw,
+                                                     PAGE_SIZE);
+                        mem_cgroup_swap_statistics(swap_memcg, false);
+                        mem_cgroup_put(swap_memcg);
                 }
                 rcu_read_unlock();
         }
@@ -2920,13 +2921,14 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
          * So, rmdir()->pre_destroy() can be called while we do this charge.
          * In that case, we need to call pre_destroy() again. check it here.
          */
-        cgroup_release_and_wakeup_rmdir(&ptr->css);
+        cgroup_release_and_wakeup_rmdir(&memcg->css);
 }
 
-void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
+void mem_cgroup_commit_charge_swapin(struct page *page,
+                                     struct mem_cgroup *memcg)
 {
-        __mem_cgroup_commit_charge_swapin(page, ptr,
-                                        MEM_CGROUP_CHARGE_TYPE_MAPPED);
+        __mem_cgroup_commit_charge_swapin(page, memcg,
+                                          MEM_CGROUP_CHARGE_TYPE_MAPPED);
 }
 
 void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
@@ -3255,14 +3257,14 @@ static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
  * page belongs to.
  */
 int mem_cgroup_prepare_migration(struct page *page,
-        struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask)
+        struct page *newpage, struct mem_cgroup **memcgp, gfp_t gfp_mask)
 {
         struct mem_cgroup *memcg = NULL;
         struct page_cgroup *pc;
         enum charge_type ctype;
         int ret = 0;
 
-        *ptr = NULL;
+        *memcgp = NULL;
 
         VM_BUG_ON(PageTransHuge(page));
         if (mem_cgroup_disabled())
@@ -3313,10 +3315,10 @@ int mem_cgroup_prepare_migration(struct page *page,
         if (!memcg)
                 return 0;
 
-        *ptr = memcg;
-        ret = __mem_cgroup_try_charge(NULL, gfp_mask, 1, ptr, false);
+        *memcgp = memcg;
+        ret = __mem_cgroup_try_charge(NULL, gfp_mask, 1, memcgp, false);
         css_put(&memcg->css);/* drop extra refcnt */
-        if (ret || *ptr == NULL) {
+        if (ret || *memcgp == NULL) {
                 if (PageAnon(page)) {
                         lock_page_cgroup(pc);
                         ClearPageCgroupMigration(pc);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 05c0f27d4ed1..2958fd8e7c9a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -152,7 +152,7 @@ struct task_struct *find_lock_task_mm(struct task_struct *p)
 
 /* return true if the task is not adequate as candidate victim task. */
 static bool oom_unkillable_task(struct task_struct *p,
-                const struct mem_cgroup *mem, const nodemask_t *nodemask)
+                const struct mem_cgroup *memcg, const nodemask_t *nodemask)
 {
         if (is_global_init(p))
                 return true;
@@ -160,7 +160,7 @@ static bool oom_unkillable_task(struct task_struct *p,
                 return true;
 
         /* When mem_cgroup_out_of_memory() and p is not member of the group */
-        if (mem && !task_in_mem_cgroup(p, mem))
+        if (memcg && !task_in_mem_cgroup(p, memcg))
                 return true;
 
         /* p may not have freeable memory in nodemask */
@@ -179,12 +179,12 @@ static bool oom_unkillable_task(struct task_struct *p,
  * predictable as possible.  The goal is to return the highest value for the
  * task consuming the most memory to avoid subsequent oom failures.
  */
-unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
+unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
                       const nodemask_t *nodemask, unsigned long totalpages)
 {
         long points;
 
-        if (oom_unkillable_task(p, mem, nodemask))
+        if (oom_unkillable_task(p, memcg, nodemask))
                 return 0;
 
         p = find_lock_task_mm(p);
@@ -308,7 +308,7 @@ static enum oom_constraint constrained_alloc(struct zonelist *zonelist,
  * (not docbooked, we don't want this one cluttering up the manual)
  */
 static struct task_struct *select_bad_process(unsigned int *ppoints,
-                unsigned long totalpages, struct mem_cgroup *mem,
+                unsigned long totalpages, struct mem_cgroup *memcg,
                 const nodemask_t *nodemask)
 {
         struct task_struct *g, *p;
@@ -320,7 +320,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 
                 if (p->exit_state)
                         continue;
-                if (oom_unkillable_task(p, mem, nodemask))
+                if (oom_unkillable_task(p, memcg, nodemask))
                         continue;
 
                 /*
@@ -364,7 +364,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
                         }
                 }
 
-                points = oom_badness(p, mem, nodemask, totalpages);
+                points = oom_badness(p, memcg, nodemask, totalpages);
                 if (points > *ppoints) {
                         chosen = p;
                         *ppoints = points;
@@ -387,14 +387,14 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
  *
  * Call with tasklist_lock read-locked.
  */
-static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
+static void dump_tasks(const struct mem_cgroup *memcg, const nodemask_t *nodemask)
 {
         struct task_struct *p;
         struct task_struct *task;
 
         pr_info("[ pid ]   uid  tgid total_vm      rss cpu oom_adj oom_score_adj name\n");
         for_each_process(p) {
-                if (oom_unkillable_task(p, mem, nodemask))
+                if (oom_unkillable_task(p, memcg, nodemask))
                         continue;
 
                 task = find_lock_task_mm(p);
@@ -417,7 +417,7 @@ static void dump_tasks(const struct mem_cgroup *mem, const nodemask_t *nodemask)
 }
 
 static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
-                        struct mem_cgroup *mem, const nodemask_t *nodemask)
+                        struct mem_cgroup *memcg, const nodemask_t *nodemask)
 {
         task_lock(current);
         pr_warning("%s invoked oom-killer: gfp_mask=0x%x, order=%d, "
@@ -427,10 +427,10 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
         cpuset_print_task_mems_allowed(current);
         task_unlock(current);
         dump_stack();
-        mem_cgroup_print_oom_info(mem, p);
+        mem_cgroup_print_oom_info(memcg, p);
         show_mem(SHOW_MEM_FILTER_NODES);
         if (sysctl_oom_dump_tasks)
-                dump_tasks(mem, nodemask);
+                dump_tasks(memcg, nodemask);
 }
 
 #define K(x) ((x) << (PAGE_SHIFT-10))
@@ -484,7 +484,7 @@ static int oom_kill_task(struct task_struct *p)
 
 static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
                             unsigned int points, unsigned long totalpages,
-                            struct mem_cgroup *mem, nodemask_t *nodemask,
+                            struct mem_cgroup *memcg, nodemask_t *nodemask,
                             const char *message)
 {
         struct task_struct *victim = p;
@@ -493,7 +493,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
         unsigned int victim_points = 0;
 
         if (printk_ratelimit())
-                dump_header(p, gfp_mask, order, mem, nodemask);
+                dump_header(p, gfp_mask, order, memcg, nodemask);
 
         /*
          * If the task is already exiting, don't alarm the sysadmin or kill
@@ -524,7 +524,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
                         /*
                          * oom_badness() returns 0 if the thread is unkillable
                          */
-                        child_points = oom_badness(child, mem, nodemask,
+                        child_points = oom_badness(child, memcg, nodemask,
                                                                 totalpages);
                         if (child_points > victim_points) {
                                 victim = child;
@@ -561,7 +561,7 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
 }
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
-void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
+void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask)
 {
         unsigned long limit;
         unsigned int points = 0;
@@ -578,14 +578,14 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
         }
 
         check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL);
-        limit = mem_cgroup_get_limit(mem) >> PAGE_SHIFT;
+        limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT;
         read_lock(&tasklist_lock);
 retry:
-        p = select_bad_process(&points, limit, mem, NULL);
+        p = select_bad_process(&points, limit, memcg, NULL);
         if (!p || PTR_ERR(p) == -1UL)
                 goto out;
 
-        if (oom_kill_process(p, gfp_mask, 0, points, limit, mem, NULL,
+        if (oom_kill_process(p, gfp_mask, 0, points, limit, memcg, NULL,
                                 "Memory cgroup out of memory"))
                 goto retry;
 out:
diff --git a/mm/rmap.c b/mm/rmap.c
index a2e5ce1fa081..c8454e06b6c8 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -773,7 +773,7 @@ out:
 }
 
 static int page_referenced_anon(struct page *page,
-                                struct mem_cgroup *mem_cont,
+                                struct mem_cgroup *memcg,
                                 unsigned long *vm_flags)
 {
         unsigned int mapcount;
@@ -796,7 +796,7 @@ static int page_referenced_anon(struct page *page,
                  * counting on behalf of references from different
                  * cgroups
                  */
-                if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont))
+                if (memcg && !mm_match_cgroup(vma->vm_mm, memcg))
                         continue;
                 referenced += page_referenced_one(page, vma, address,
                                                   &mapcount, vm_flags);
@@ -811,7 +811,7 @@ static int page_referenced_anon(struct page *page,
 /**
  * page_referenced_file - referenced check for object-based rmap
  * @page: the page we're checking references on.
- * @mem_cont: target memory controller
+ * @memcg: target memory control group
  * @vm_flags: collect encountered vma->vm_flags who actually referenced the page
  *
  * For an object-based mapped page, find all the places it is mapped and
@@ -822,7 +822,7 @@ static int page_referenced_anon(struct page *page,
  * This function is only called from page_referenced for object-based pages.
  */
 static int page_referenced_file(struct page *page,
-                                struct mem_cgroup *mem_cont,
+                                struct mem_cgroup *memcg,
                                 unsigned long *vm_flags)
 {
         unsigned int mapcount;
@@ -864,7 +864,7 @@ static int page_referenced_file(struct page *page,
                  * counting on behalf of references from different
                  * cgroups
                  */
-                if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont))
+                if (memcg && !mm_match_cgroup(vma->vm_mm, memcg))
                         continue;
                 referenced += page_referenced_one(page, vma, address,
                                                   &mapcount, vm_flags);
@@ -880,7 +880,7 @@ static int page_referenced_file(struct page *page,
  * page_referenced - test if the page was referenced
  * @page: the page to test
  * @is_locked: caller holds lock on the page
- * @mem_cont: target memory controller
+ * @memcg: target memory cgroup
  * @vm_flags: collect encountered vma->vm_flags who actually referenced the page
  *
  * Quick test_and_clear_referenced for all mappings to a page,
@@ -888,7 +888,7 @@ static int page_referenced_file(struct page *page,
  */
 int page_referenced(struct page *page,
                     int is_locked,
-                    struct mem_cgroup *mem_cont,
+                    struct mem_cgroup *memcg,
                     unsigned long *vm_flags)
 {
         int referenced = 0;
@@ -904,13 +904,13 @@ int page_referenced(struct page *page,
                         }
                 }
                 if (unlikely(PageKsm(page)))
-                        referenced += page_referenced_ksm(page, mem_cont,
+                        referenced += page_referenced_ksm(page, memcg,
                                                                 vm_flags);
                 else if (PageAnon(page))
-                        referenced += page_referenced_anon(page, mem_cont,
+                        referenced += page_referenced_anon(page, memcg,
                                                                 vm_flags);
                 else if (page->mapping)
-                        referenced += page_referenced_file(page, mem_cont,
+                        referenced += page_referenced_file(page, memcg,
                                                                 vm_flags);
                 if (we_locked)
                         unlock_page(page);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 9520592d4231..d999f090dfda 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -847,12 +847,13 @@ unsigned int count_swap_pages(int type, int free)
 static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
                 unsigned long addr, swp_entry_t entry, struct page *page)
 {
-        struct mem_cgroup *ptr;
+        struct mem_cgroup *memcg;
         spinlock_t *ptl;
         pte_t *pte;
         int ret = 1;
 
-        if (mem_cgroup_try_charge_swapin(vma->vm_mm, page, GFP_KERNEL, &ptr)) {
+        if (mem_cgroup_try_charge_swapin(vma->vm_mm, page,
+                                         GFP_KERNEL, &memcg)) {
                 ret = -ENOMEM;
                 goto out_nolock;
         }
@@ -860,7 +861,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
         if (unlikely(!pte_same(*pte, swp_entry_to_pte(entry)))) {
                 if (ret > 0)
-                        mem_cgroup_cancel_charge_swapin(ptr);
+                        mem_cgroup_cancel_charge_swapin(memcg);
                 ret = 0;
                 goto out;
         }
@@ -871,7 +872,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
         set_pte_at(vma->vm_mm, addr, pte,
                    pte_mkold(mk_pte(page, vma->vm_page_prot)));
         page_add_anon_rmap(page, vma, addr);
-        mem_cgroup_commit_charge_swapin(page, ptr);
+        mem_cgroup_commit_charge_swapin(page, memcg);
         swap_free(entry);
         /*
          * Move the page to the active list so it is not
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 813aae820a27..e16ca8384ef7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2376,7 +2376,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
 
-unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
+unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
                                                 gfp_t gfp_mask, bool noswap,
                                                 struct zone *zone,
                                                 unsigned long *nr_scanned)
@@ -2388,10 +2388,10 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
                 .may_unmap = 1,
                 .may_swap = !noswap,
                 .order = 0,
-                .target_mem_cgroup = mem,
+                .target_mem_cgroup = memcg,
         };
         struct mem_cgroup_zone mz = {
-                .mem_cgroup = mem,
+                .mem_cgroup = memcg,
                 .zone = zone,
         };
 
@@ -2417,7 +2417,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
         return sc.nr_reclaimed;
 }
 
-unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
+unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
                                            gfp_t gfp_mask,
                                            bool noswap)
 {
@@ -2430,7 +2430,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
                 .may_swap = !noswap,
                 .nr_to_reclaim = SWAP_CLUSTER_MAX,
                 .order = 0,
-                .target_mem_cgroup = mem_cont,
+                .target_mem_cgroup = memcg,
                 .nodemask = NULL, /* we don't care the placement */
                 .gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
                                 (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK),
@@ -2444,7 +2444,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
          * take care of from where we get pages. So the node where we start the
          * scan does not need to be the current node.
          */
-        nid = mem_cgroup_select_victim_node(mem_cont);
+        nid = mem_cgroup_select_victim_node(memcg);
 
         zonelist = NODE_DATA(nid)->node_zonelists;