[Crash-utility] [PATCH 1/3] Fix task state bitmasks for 4.14 and later

[Kazuhito Hagio]

Since Linux 4.14, kernel commit 20435d84e5 ("sched/debug: Intruduce
task_state_to_char() helper function") removed the 'stat_nam' symbol,
with which we've got the values of task state bitmasks.  So now we
need to get them correctly by using 'task_state_array' again.

Signed-off-by: Kazuhito Hagio <k-hagio at ab.jp.nec.com>
---
 task.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/task.c b/task.c
index 1b32629..164e546 100644
--- a/task.c
+++ b/task.c
@@ -5282,6 +5282,7 @@ old_defaults:
 	/*
 	 *  If the later version of stat_nam[] array exists that contains 
 	 *  WAKING, WAKEKILL and PARKED, use it instead of task_state_array[].
+	 *  Available since kernel version 2.6.33 to 4.13.
 	 */
 	if (((len = get_array_length("stat_nam", NULL, 0)) > 0) &&
 	    read_string(symbol_value("stat_nam"), buf, BUFSIZE-1) &&
@@ -5393,7 +5394,15 @@ old_defaults:
 		_NONINTERACTIVE_ = 64;
 	}
 
-	if (THIS_KERNEL_VERSION >= LINUX(2,6,32)) {
+	if (THIS_KERNEL_VERSION >= LINUX(4,14,0)) {
+		if (valid_task_state(_PARKED_)) {
+			bitpos = _PARKED_;
+			_DEAD_ |= (bitpos << 1);    /* TASK_DEAD */
+			_WAKEKILL_ = (bitpos << 2); /* TASK_WAKEKILL */
+			_WAKING_ = (bitpos << 3);   /* TASK_WAKING */
+			_NOLOAD_ = (bitpos << 4);   /* TASK_NOLOAD */
+		}
+	} else if (THIS_KERNEL_VERSION >= LINUX(2,6,32)) {
 		/*
 	 	 * Account for states not listed in task_state_array[]
 		 */
-- 
1.8.3.1