Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:

 - the rest of MM

 - KASAN updates

 - procfs updates

 - exit, fork updates

 - printk updates

 - lib/ updates

 - radix-tree testsuite updates

 - checkpatch updates

 - kprobes updates

 - a few other misc bits

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (162 commits)
  samples/kprobes: print out the symbol name for the hooks
  samples/kprobes: add a new module parameter
  kprobes: add the "tls" argument for j_do_fork
  init/main.c: simplify initcall_blacklisted()
  fs/efs/super.c: fix return value
  checkpatch: improve --git <commit-count> shortcut
  checkpatch: reduce number of `git log` calls with --git
  checkpatch: add support to check already applied git commits
  checkpatch: add --list-types to show message types to show or ignore
  checkpatch: advertise the --fix and --fix-inplace options more
  checkpatch: whine about ACCESS_ONCE
  checkpatch: add test for keywords not starting on tabstops
  checkpatch: improve CONSTANT_COMPARISON test for structure members
  checkpatch: add PREFER_IS_ENABLED test
  lib/GCD.c: use binary GCD algorithm instead of Euclidean
  radix-tree: free up the bottom bit of exceptional entries for reuse
  dax: move RADIX_DAX_ definitions to dax.c
  radix-tree: make radix_tree_descend() more useful
  radix-tree: introduce radix_tree_replace_clear_tags()
  radix-tree: tidy up __radix_tree_create()
  ...

1 files changed, 26 insertions, 9 deletions

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index d8fb10de0f14..eec1150125b9 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -67,26 +67,42 @@ static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)
 	return false;
 }
 
+static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
+				struct hugetlb_cgroup *parent_h_cgroup)
+{
+	int idx;
+
+	for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) {
+		struct page_counter *counter = &h_cgroup->hugepage[idx];
+		struct page_counter *parent = NULL;
+		unsigned long limit;
+		int ret;
+
+		if (parent_h_cgroup)
+			parent = &parent_h_cgroup->hugepage[idx];
+		page_counter_init(counter, parent);
+
+		limit = round_down(PAGE_COUNTER_MAX,
+				   1 << huge_page_order(&hstates[idx]));
+		ret = page_counter_limit(counter, limit);
+		VM_BUG_ON(ret);
+	}
+}
+
 static struct cgroup_subsys_state *
 hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
 {
 	struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css);
 	struct hugetlb_cgroup *h_cgroup;
-	int idx;
 
 	h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
 	if (!h_cgroup)
 		return ERR_PTR(-ENOMEM);
 
-	if (parent_h_cgroup) {
-		for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
-			page_counter_init(&h_cgroup->hugepage[idx],
-					  &parent_h_cgroup->hugepage[idx]);
-	} else {
+	if (!parent_h_cgroup)
 		root_h_cgroup = h_cgroup;
-		for (idx = 0; idx < HUGE_MAX_HSTATE; idx++)
-			page_counter_init(&h_cgroup->hugepage[idx], NULL);
-	}
+
+	hugetlb_cgroup_init(h_cgroup, parent_h_cgroup);
 	return &h_cgroup->css;
 }
 
@@ -285,6 +301,7 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
 		return ret;
 
 	idx = MEMFILE_IDX(of_cft(of)->private);
+	nr_pages = round_down(nr_pages, 1 << huge_page_order(&hstates[idx]));
 
 	switch (MEMFILE_ATTR(of_cft(of)->private)) {
 	case RES_LIMIT: