[PATCH 1/2] ArmPlatformPkg/PL031RealTimeClockLib: cast EfiTimeToEpoch() val. to UINT32

["Laszlo Ersek" <lersek@redhat.com>]

In preparation for changing EfiTimeToEpoch()'s return type to UINTN, cast
EfiTimeToEpoch()'s retval to UINT32 explicitly, in LibSetTime().

Currently, this is a no-op, and even after widening the retval, it will
make no difference, as LibSetTime() explicitly restricts Time->Year under
2106, given that "the PL031 is a 32-bit counter counting seconds". The
patch is made for preventing compiler warnings.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c b/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c
index 0df4ceb1cb39..3afef4bf9ad4 100644
--- a/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c
+++ b/ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.c
@@ -180,53 +180,53 @@ EFIAPI
 LibSetTime (
   IN  EFI_TIME                *Time
   )
 {
   EFI_STATUS  Status;
   UINT32      EpochSeconds;
 
   // Because the PL031 is a 32-bit counter counting seconds,
   // the maximum time span is just over 136 years.
   // Time is stored in Unix Epoch format, so it starts in 1970,
   // Therefore it can not exceed the year 2106.
   if ((Time->Year < 1970) || (Time->Year >= 2106)) {
     return EFI_UNSUPPORTED;
   }
 
   // Initialize the hardware if not already done
   if (!mPL031Initialized) {
     Status = InitializePL031 ();
     if (EFI_ERROR (Status)) {
       return Status;
     }
   }
 
-  EpochSeconds = EfiTimeToEpoch (Time);
+  EpochSeconds = (UINT32)EfiTimeToEpoch (Time);
 
   // Adjust for the correct time zone, i.e. convert to UTC time zone
   // The timezone setting also reflects the DST setting of the clock
   if (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
     EpochSeconds -= Time->TimeZone * SEC_PER_MIN;
   } else if ((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT) {
     // Convert to un-adjusted time, i.e. fall back one hour
     EpochSeconds -= SEC_PER_HOUR;
   }
 
   // Set the PL031
   MmioWrite32 (mPL031RtcBase + PL031_RTC_LR_LOAD_REGISTER, EpochSeconds);
 
   return EFI_SUCCESS;
 }
 
 
 /**
   Returns the current wakeup alarm clock setting.
 
   @param  Enabled               Indicates if the alarm is currently enabled or disabled.
   @param  Pending               Indicates if the alarm signal is pending and requires acknowledgement.
   @param  Time                  The current alarm setting.
 
   @retval EFI_SUCCESS           The alarm settings were returned.
   @retval EFI_INVALID_PARAMETER Any parameter is NULL.
   @retval EFI_DEVICE_ERROR      The wakeup time could not be retrieved due to a hardware error.
 
 **/
-- 
2.19.1.3.g30247aa5d201