Merge tag 'v4.14-rc2' into patchwork

Linux 4.14-rc2

* tag 'v4.14-rc2': (12066 commits)
  Linux 4.14-rc2
  tpm: ibmvtpm: simplify crq initialization and document crq format
  tpm: replace msleep() with  usleep_range() in TPM 1.2/2.0 generic drivers
  Documentation: tpm: add powered-while-suspended binding documentation
  tpm: tpm_crb: constify acpi_device_id.
  tpm: vtpm: constify vio_device_id
  security: fix description of values returned by cap_inode_need_killpriv
  x86/asm: Fix inline asm call constraints for Clang
  objtool: Handle another GCC stack pointer adjustment bug
  inet: fix improper empty comparison
  net: use inet6_rcv_saddr to compare sockets
  net: set tb->fast_sk_family
  net: orphan frags on stand-alone ptype in dev_queue_xmit_nit
  MAINTAINERS: update git tree locations for ieee802154 subsystem
  SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags
  SMB3: handle new statx fields
  arch: remove unused *_segments() macros/functions
  parisc: Unbreak bootloader due to gcc-7 optimizations
  parisc: Reintroduce option to gzip-compress the kernel
  apparmor: fix apparmorfs DAC access permissions
  ...

1 files changed, 38 insertions, 13 deletions

diff --git a/kernel/cgroup/debug.c b/kernel/cgroup/debug.c
index dac46af22782..f661b4cc5efd 100644
--- a/kernel/cgroup/debug.c
+++ b/kernel/cgroup/debug.c
@@ -114,27 +114,49 @@ static int cgroup_css_links_read(struct seq_file *seq, void *v)
 {
 	struct cgroup_subsys_state *css = seq_css(seq);
 	struct cgrp_cset_link *link;
-	int dead_cnt = 0, extra_refs = 0;
+	int dead_cnt = 0, extra_refs = 0, threaded_csets = 0;
 
 	spin_lock_irq(&css_set_lock);
+
 	list_for_each_entry(link, &css->cgroup->cset_links, cset_link) {
 		struct css_set *cset = link->cset;
 		struct task_struct *task;
 		int count = 0;
 		int refcnt = refcount_read(&cset->refcount);
 
-		seq_printf(seq, " %d", refcnt);
-		if (refcnt - cset->nr_tasks > 0) {
-			int extra = refcnt - cset->nr_tasks;
+		/*
+		 * Print out the proc_cset and threaded_cset relationship
+		 * and highlight difference between refcount and task_count.
+		 */
+		seq_printf(seq, "css_set %pK", cset);
+		if (rcu_dereference_protected(cset->dom_cset, 1) != cset) {
+			threaded_csets++;
+			seq_printf(seq, "=>%pK", cset->dom_cset);
+		}
+		if (!list_empty(&cset->threaded_csets)) {
+			struct css_set *tcset;
+			int idx = 0;
+
+			list_for_each_entry(tcset, &cset->threaded_csets,
+					    threaded_csets_node) {
+				seq_puts(seq, idx ? "," : "<=");
+				seq_printf(seq, "%pK", tcset);
+				idx++;
+			}
+		} else {
+			seq_printf(seq, " %d", refcnt);
+			if (refcnt - cset->nr_tasks > 0) {
+				int extra = refcnt - cset->nr_tasks;
 
-			seq_printf(seq, " +%d", extra);
-			/*
-			 * Take out the one additional reference in
-			 * init_css_set.
-			 */
-			if (cset == &init_css_set)
-				extra--;
-			extra_refs += extra;
+				seq_printf(seq, " +%d", extra);
+				/*
+				 * Take out the one additional reference in
+				 * init_css_set.
+				 */
+				if (cset == &init_css_set)
+					extra--;
+				extra_refs += extra;
+			}
 		}
 		seq_puts(seq, "\n");
 
@@ -163,10 +185,12 @@ static int cgroup_css_links_read(struct seq_file *seq, void *v)
 	}
 	spin_unlock_irq(&css_set_lock);
 
-	if (!dead_cnt && !extra_refs)
+	if (!dead_cnt && !extra_refs && !threaded_csets)
 		return 0;
 
 	seq_puts(seq, "\n");
+	if (threaded_csets)
+		seq_printf(seq, "threaded css_sets = %d\n", threaded_csets);
 	if (extra_refs)
 		seq_printf(seq, "extra references = %d\n", extra_refs);
 	if (dead_cnt)
@@ -352,6 +376,7 @@ static int __init enable_cgroup_debug(char *str)
 {
 	debug_cgrp_subsys.dfl_cftypes = debug_files;
 	debug_cgrp_subsys.implicit_on_dfl = true;
+	debug_cgrp_subsys.threaded = true;
 	return 1;
 }
 __setup("cgroup_debug", enable_cgroup_debug);