powerpc/eeh: Stop using do_gettimeofday()

This interface is inefficient and deprecated because of the y2038
overflow.

ktime_get_seconds() is an appropriate replacement here, since it
has sufficient granularity but is more efficient and uses monotonic
time.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/eeh.h

@@ -93,7 +93,7 @@ struct eeh_pe {
 	struct pci_bus *bus;		/* Top PCI bus for bus PE	*/
 	int check_count;		/* Times of ignored error	*/
 	int freeze_count;		/* Times of froze up		*/
-	struct timeval tstamp;		/* Time on first-time freeze	*/
+	time64_t tstamp;		/* Time on first-time freeze	*/
 	int false_positives;		/* Times of reported #ff's	*/
 	atomic_t pass_dev_cnt;		/* Count of passed through devs	*/
 	struct eeh_pe *parent;		/* Parent PE			*/

arch/powerpc/kernel/eeh_driver.c

@@ -623,7 +623,7 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
 				struct eeh_rmv_data *rmv_data)
 {
 	struct pci_bus *frozen_bus = eeh_pe_bus_get(pe);
-	struct timeval tstamp;
+	time64_t tstamp;
 	int cnt, rc;
 	struct eeh_dev *edev;
 

arch/powerpc/kernel/eeh_pe.c

@@ -526,16 +526,16 @@ int eeh_rmv_from_parent_pe(struct eeh_dev *edev)
  */
 void eeh_pe_update_time_stamp(struct eeh_pe *pe)
 {
-	struct timeval tstamp;
+	time64_t tstamp;
 
 	if (!pe) return;
 
 	if (pe->freeze_count <= 0) {
 		pe->freeze_count = 0;
-		do_gettimeofday(&pe->tstamp);
+		pe->tstamp = ktime_get_seconds();
 	} else {
-		do_gettimeofday(&tstamp);
-		if (tstamp.tv_sec - pe->tstamp.tv_sec > 3600) {
+		tstamp = ktime_get_seconds();
+		if (tstamp - pe->tstamp > 3600) {
 			pe->tstamp = tstamp;
 			pe->freeze_count = 0;
 		}