APPLIED: [SRU][J/oracle,F/oracle-5.15][PATCH 0/1] UBUNTU: SAUCE: Revert "rtc: rtc-cmos: Do not check ACPI_FADT_LOW_POWER_S0"

[Cory Todd]

Applied linux-oracle.

- corytodd

On Wed, Mar 22, 2023 at 08:49:55PM -0700, Cory Todd wrote:
> From: Cory Todd <cory.todd at canonical.com>
> 
> SRU Justification:
> 
> BugLink: https://bugs.launchpad.net/bugs/2011854
> 
> [Impact]
> On amd64, the RTC alarm interrupt and update interrupt can be enabled but
> will never fire.
> 
> [Fix]
> Revert the commit that disables the use of HPET. These systems do not have
> a functional CMOS RTC and have been relying on HPET for these interrupts
> to work.
> 
> [Test Plan]
> 1. Provision three vms: both instance types reporting the regression
>    and another instance type not reporting a regression.
> 2. Install and boot test kernel
> 3. Run ltp rtc01 regression test, all cases pass
> 
> [Where Problems Could Occur]
> The BIOS on these systems could be updated and these interrupts would
> continue to use HPET even though a functional CMOS RTC might be available.
> 
> Cory Todd (1):
>   UBUNTU: SAUCE: Revert "rtc: rtc-cmos: Do not check
>     ACPI_FADT_LOW_POWER_S0"
> 
>  drivers/rtc/rtc-cmos.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> --
> 2.40.0
>