MFC r303382:

Provide the getboottime(9) and getboottimebin(9) KPI.

MFC r303387:
Prevent parallel tc_windup() calls.  Keep boottime in timehands,
and adjust it from tc_windup().

MFC notes:

The boottime and boottimebin globals are still exported from
the kernel dyn symbol table in stable/11, but their declarations are
removed from sys/time.h.  This preserves KBI but not KPI, while all
in-tree consumers are converted to getboottime().

The variables are updated after tc_setclock_mtx is dropped, which gives
approximately same unlocked bugs as before.

The boottime and boottimebin locals in several sys/kern_tc.c functions
were renamed by adding the '_x' suffix to avoid name conficts.

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/kern/sys_procdesc.c b/sys/kern/sys_procdesc.c
index 37139c1..f47ae7c 100644
--- a/sys/kern/sys_procdesc.c
+++ b/sys/kern/sys_procdesc.c
@@ -517,7 +517,7 @@ procdesc_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
     struct thread *td)
 {
 	struct procdesc *pd;
-	struct timeval pstart;
+	struct timeval pstart, boottime;
 
 	/*
 	 * XXXRW: Perhaps we should cache some more information from the
@@ -532,6 +532,7 @@ procdesc_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
 
 		/* Set birth and [acm] times to process start time. */
 		pstart = pd->pd_proc->p_stats->p_start;
+		getboottime(&boottime);
 		timevaladd(&pstart, &boottime);
 		TIMEVAL_TO_TIMESPEC(&pstart, &sb->st_birthtim);
 		sb->st_atim = sb->st_birthtim;