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Re: [PATCH for-4.22 1/5] x86/time: use RTC century byte when available
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 13 May 2026 12:36:26 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Wed, 13 May 2026 10:36:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.05.2026 10:49, Roger Pau Monné wrote:
> On Tue, May 12, 2026 at 04:58:43PM +0200, Jan Beulich wrote:
>> @@ -1280,6 +1281,8 @@ static bool __get_cmos_time(struct rtc_t
>> rtc->day = CMOS_READ(RTC_DAY_OF_MONTH);
>> rtc->mon = CMOS_READ(RTC_MONTH);
>> rtc->year = CMOS_READ(RTC_YEAR);
>> + if ( acpi_gbl_FADT.century && acpi_gbl_FADT.century < 0x80 )
>> + century = CMOS_READ(acpi_gbl_FADT.century);
>>
>> if ( RTC_ALWAYS_BCD || !(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) )
>> {
>> @@ -1293,7 +1296,12 @@ static bool __get_cmos_time(struct rtc_t
>>
>> spin_unlock_irqrestore(&rtc_lock, flags);
>>
>> - if ( (rtc->year += 1900) < 1970 )
>> + if ( century )
>> + {
>> + BCD_TO_BIN(century);
>
> Don't you need to move the BCD_TO_BIN() translation with the rest, so
> it's not done unconditionally?
No, the century field is always BCD.
Jan
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