[Crash-utility] [PATCH] Move the initialization of "boot_date" to task_init()

[Lianbo Jiang]

The "boot_date" is initialized conditionally in the cmd_log(), which may
display incorrect "boot_date" value with the following command before
running the "log -T" command:

crash> help -k | grep date
          date: Wed Dec 22 13:39:29 IST 2021
     boot_date: Thu Jan  1 05:30:00 IST 1970
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The calculation of "boot_date" depends on the HZ value, and the HZ will
be calculated in task_init() at the latest, so let's move it here.

Fixes: c86250bce29f ("Introduction of the "log -T" option...")
Signed-off-by: Lianbo Jiang <lijiang at redhat.com>
---
 kernel.c | 18 +++---------------
 task.c   | 10 ++++++++++
 2 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/kernel.c b/kernel.c
index 36c57ed501ad..094fe9b2efad 100644
--- a/kernel.c
+++ b/kernel.c
@@ -5025,21 +5025,9 @@ cmd_log(void)
         if (argerrs)
                 cmd_usage(pc->curcmd, SYNOPSIS);
 
-	if (msg_flags & SHOW_LOG_CTIME) {
-		if (pc->flags & MINIMAL_MODE) {
-			error(WARNING, "the option '-T' is not available in minimal mode\n");
-			return;
-		}
-
-		if (kt->boot_date.tv_sec == 0) {
-			ulonglong uptime_jiffies;
-			ulong  uptime_sec;
-
-			get_uptime(NULL, &uptime_jiffies);
-			uptime_sec = (uptime_jiffies)/(ulonglong)machdep->hz;
-			kt->boot_date.tv_sec = kt->date.tv_sec - uptime_sec;
-			kt->boot_date.tv_nsec = 0;
-		}
+	if (msg_flags & SHOW_LOG_CTIME && pc->flags & MINIMAL_MODE) {
+		error(WARNING, "the option '-T' is not available in minimal mode\n");
+		return;
 	}
 
 	if (msg_flags & SHOW_LOG_AUDIT) {
diff --git a/task.c b/task.c
index 76e184ae70b1..263a8344dd94 100644
--- a/task.c
+++ b/task.c
@@ -692,6 +692,16 @@ task_init(void)
 
 	stack_overflow_check_init();
 
+	if (machdep->hz) {
+		ulonglong uptime_jiffies;
+		ulong  uptime_sec;
+
+		get_uptime(NULL, &uptime_jiffies);
+		uptime_sec = (uptime_jiffies)/(ulonglong)machdep->hz;
+		kt->boot_date.tv_sec = kt->date.tv_sec - uptime_sec;
+		kt->boot_date.tv_nsec = 0;
+	}
+
 	tt->flags |= TASK_INIT_DONE;
 }
 
-- 
2.20.1