ACK: [SRU][Artful][PATCH 0/3] Fixes for LP:1744988

[Khaled Elmously]

On 2018-02-01 13:59:26 , Joseph Salisbury wrote:
> BugLink: http://bugs.launchpad.net/bugs/1744988
> 
> == SRU Justification ==
> The bug reporter observeed NTP time drift on two servers running hwe kernels 
> in Xenial. After rebooting the servers to the 4.10 or 4.13 kernels we were 
> seeing a big time offset within minutes after booting. Despite running 
> ntpd, it would not keep up and the offset stayed and kept growing over time.
> 
> This is a regression that did not exist in the 4.4 Xenial kernel.  This regression
> is fixed by three mainline commits, da4ae6c4a, b511203093 and 4b5b2127238. All
> three commits were added to mainline in v4.15-rc9. 
> 
> Bionic already recieved these patches via upstream stable updates.
> 
> == Fixes ==
> da4ae6c4a0b8 ("x86/tsc: Future-proof native_calibrate_tsc()")
> b51120309348 ("x86/tsc: Fix erroneous TSC rate on Skylake Xeon")
> 4b5b2127238e ("x86/tsc: Print tsc_khz, when it differs from cpu_khz")
> 
> == Regression Potential ==
> Low.  These three commits fix an existing regression.  They were also cc'd to 
> stable so have had addition upstream review.
> 
> == Test Case ==
> A test kernel was built with these patches and tested by the original bug reporter.
> The bug reporter states the test kernel resolved the bug. 
> 
> 
> Len Brown (3):
>   x86/tsc: Future-proof native_calibrate_tsc()
>   x86/tsc: Fix erroneous TSC rate on Skylake Xeon
>   x86/tsc: Print tsc_khz, when it differs from cpu_khz
> 
>  arch/x86/kernel/tsc.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
Acked-by: Khalid Elmously <khalid.elmously at canonical.com>