[PATCH -repost 14/21] kgr: add procfs interface for per-process 'kgr_in_progress'

[Jiri Slaby]

From: Jiri Kosina <jkosina@xxxxxxx>

Instead of flooding dmesg with data about tasks which haven't yet been
migrated to the "new universe", create a 'kgr_in_progress' in
/proc/<pid>/ so that it's possible to easily script the checks/actions
in userspace.

js: use the kgr helper

Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> [simplification]
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
---
 fs/proc/base.c  | 11 +++++++++++
 kernel/kgraft.c |  3 +--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 2d696b0c93bf..60f7b1ce5d1c 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -87,6 +87,7 @@
 #include <linux/slab.h>
 #include <linux/flex_array.h>
 #include <linux/posix-timers.h>
+#include <linux/kgraft.h>
 #ifdef CONFIG_HARDWALL
 #include <asm/hardwall.h>
 #endif
@@ -2106,6 +2107,13 @@ static const struct file_operations proc_timers_operations = {
 };
 #endif /* CONFIG_CHECKPOINT_RESTORE */
 
+#if IS_ENABLED(CONFIG_KGRAFT)
+static int proc_pid_kgr_in_progress(struct task_struct *task, char *buffer)
+{
+	return sprintf(buffer, "%d\n", kgr_task_in_progress(task));
+}
+#endif /* IS_ENABLED(CONFIG_KGRAFT) */
+
 static int proc_pident_instantiate(struct inode *dir,
 	struct dentry *dentry, struct task_struct *task, const void *ptr)
 {
@@ -2638,6 +2646,9 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_CHECKPOINT_RESTORE
 	REG("timers",	  S_IRUGO, proc_timers_operations),
 #endif
+#if IS_ENABLED(CONFIG_KGRAFT)
+	INF("kgr_in_progress",	S_IRUSR, proc_pid_kgr_in_progress),
+#endif
 };
 
 static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
diff --git a/kernel/kgraft.c b/kernel/kgraft.c
index fd0ded7ce725..d99171c6ea1d 100644
--- a/kernel/kgraft.c
+++ b/kernel/kgraft.c
@@ -77,9 +77,8 @@ static bool kgr_still_patching(void)
 	read_lock(&tasklist_lock);
 	for_each_process(p) {
 		if (kgr_task_in_progress(p)) {
-			pr_info("pid %d (%s) still in kernel after timeout\n",
-					p->pid, p->comm);
 			failed = true;
+			break;
 		}
 	}
 	read_unlock(&tasklist_lock);
-- 
2.0.0

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