Re: [PATCH 6.15.y 0/2] rtc: backport support for handling dates before 1970

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Jun 06, 2025 at 05:44:37PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> as described in the commit log of the two commits the rtc-mt6397 driver
> relies on these fixes as soon as it should store dates later than
> 2027-12-31. On one of the patches has a Fixes line, so this submission
> is done to ensure that both patches are backported.
> 
> The patches sent in reply to this mail are (trivial) backports to
> v6.15.1, they should get backported to the older stable kernels, too, to
> (somewhat) ensure that in 2028 no surprises happen. `git am` is able to
> apply the patches as is to 6.14.y, 6.12.y, 6.6.y, 6.1.y and 5.15.y.
> 
> 5.10 and 5.4 need an adaption, I didn't look into that yet but can
> follow up with backports for these.
> 
> The two fixes were accompanied by 3 test updates:
> 
> 	46351921cbe1 ("rtc: test: Emit the seconds-since-1970 value instead of days-since-1970")
> 	da62b49830f8 ("rtc: test: Also test time and wday outcome of rtc_time64_to_tm()")
> 	ccb2dba3c19f ("rtc: test: Test date conversion for dates starting in 1900")
> 
> that cover one of the patches. Would you consider it sensible to
> backport these, too?

If you want to, sure, but normally people run the latest in-kernel
selftests for older kernel trees.

thanks,

greg k-h