commit 2c3a83701dd185cadb30db4556256534e2930c7d
Author: Brian Behlendorf <behlendorf1@llnl.gov>
Date:   Wed Feb 26 13:18:07 2020 -0800

    Linux 5.6 compat: time_t
    
    As part of the Linux kernel's y2038 changes the time_t type has been
    fully retired.  Callers are now required to use the time64_t type.
    
    Rather than move to the new type, I've removed the few remaining
    places where a time_t is used in the kernel code.  They've been
    replaced with a uint64_t which is already how ZFS internally
    handled these values.
    
    Going forward we should work towards updating the remaining user
    space time_t consumers to the 64-bit interfaces.
    
    Reviewed-by: Matthew Macy <mmacy@freebsd.org>
    Reviewed-by: Tony Hutter <hutter2@llnl.gov>
    Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
    Closes #10052
    Closes #10064

diff --git a/include/spl/sys/time.h b/include/spl/sys/time.h
index 56fd725c0..4309c300b 100644
--- a/include/spl/sys/time.h
+++ b/include/spl/sys/time.h
@@ -85,7 +85,7 @@ gethrestime(inode_timespec_t *ts)
 #endif
 }
 
-static inline time_t
+static inline uint64_t
 gethrestime_sec(void)
 {
 #if defined(HAVE_INODE_TIMESPEC64_TIMES)
diff --git a/include/sys/vdev_impl.h b/include/sys/vdev_impl.h
index 4f63e1ae5..b55871a5d 100644
--- a/include/sys/vdev_impl.h
+++ b/include/sys/vdev_impl.h
@@ -272,7 +272,7 @@ struct vdev {
 	range_tree_t	*vdev_initialize_tree;	/* valid while initializing */
 	uint64_t	vdev_initialize_bytes_est;
 	uint64_t	vdev_initialize_bytes_done;
-	time_t		vdev_initialize_action_time;	/* start and end time */
+	uint64_t	vdev_initialize_action_time;	/* start and end time */
 
 	/* TRIM related */
 	boolean_t	vdev_trim_exit_wanted;
@@ -293,7 +293,7 @@ struct vdev {
 	uint64_t	vdev_trim_rate;		/* requested rate (bytes/sec) */
 	uint64_t	vdev_trim_partial;	/* requested partial TRIM */
 	uint64_t	vdev_trim_secure;	/* requested secure TRIM */
-	time_t		vdev_trim_action_time;	/* start and end time */
+	uint64_t	vdev_trim_action_time;	/* start and end time */
 
 	/* for limiting outstanding I/Os (initialize and TRIM) */
 	kmutex_t	vdev_initialize_io_lock;
diff --git a/lib/libspl/include/sys/time.h b/lib/libspl/include/sys/time.h
index 291f2190a..c9f616504 100644
--- a/lib/libspl/include/sys/time.h
+++ b/lib/libspl/include/sys/time.h
@@ -88,7 +88,7 @@ gethrestime(inode_timespec_t *ts)
 	ts->tv_nsec = tv.tv_usec * NSEC_PER_USEC;
 }
 
-static inline time_t
+static inline uint64_t
 gethrestime_sec(void)
 {
 	struct timeval tv;
diff --git a/module/zfs/zfs_debug.c b/module/zfs/zfs_debug.c
index a64971d0a..d98463f1b 100644
--- a/module/zfs/zfs_debug.c
+++ b/module/zfs/zfs_debug.c
@@ -28,7 +28,7 @@
 
 typedef struct zfs_dbgmsg {
 	procfs_list_node_t	zdm_node;
-	time_t			zdm_timestamp;
+	uint64_t		zdm_timestamp;
 	int			zdm_size;
 	char			zdm_msg[1]; /* variable length allocation */
 } zfs_dbgmsg_t;
diff --git a/module/zfs/vdev_initialize.c b/module/zfs/vdev_initialize.c
index 3e691c7f5..5899af9fc 100644
--- a/module/zfs/vdev_initialize.c
+++ b/module/zfs/vdev_initialize.c
@@ -713,7 +713,7 @@ vdev_initialize_restart(vdev_t *vd)
 		    vd->vdev_leaf_zap, VDEV_LEAF_ZAP_INITIALIZE_ACTION_TIME,
 		    sizeof (timestamp), 1, &timestamp);
 		ASSERT(err == 0 || err == ENOENT);
-		vd->vdev_initialize_action_time = (time_t)timestamp;
+		vd->vdev_initialize_action_time = timestamp;
 
 		if (vd->vdev_initialize_state == VDEV_INITIALIZE_SUSPENDED ||
 		    vd->vdev_offline) {
diff --git a/module/zfs/vdev_trim.c b/module/zfs/vdev_trim.c
index c7c429cbd..7dec07e3c 100644
--- a/module/zfs/vdev_trim.c
+++ b/module/zfs/vdev_trim.c
@@ -1051,7 +1051,7 @@ vdev_trim_restart(vdev_t *vd)
 		    vd->vdev_leaf_zap, VDEV_LEAF_ZAP_TRIM_ACTION_TIME,
 		    sizeof (timestamp), 1, &timestamp);
 		ASSERT(err == 0 || err == ENOENT);
-		vd->vdev_trim_action_time = (time_t)timestamp;
+		vd->vdev_trim_action_time = timestamp;
 
 		if (vd->vdev_trim_state == VDEV_TRIM_SUSPENDED ||
 		    vd->vdev_offline) {