ACK: [SRU][Bionic][PATCH 0/2] Fixes for LP:1773964

[Stefan Bader]

On 13.06.2018 17:10, Joseph Salisbury wrote:
> BugLink: http://bugs.launchpad.net/bugs/1773964
> 
> == SRU Justification ==
> IBM is requesting these two commits in powerpc to fix an error they are
> seeing:
> IPL: ppc64_cpu --frequency hang with INFO: rcu_sched detected stalls on 
> CPUs/tasks on w34 and wsbmc016 with 920.1714.20170330n
> 
> The first commit reduces some existing high latency delays.  The second
> commit fixes the fact that the OPAL RTC driver does not sleep in case it gets OPAL_BUSY or
> OPAL_BUSY_EVENT from firmware.
> 
> == Fixes ==
> 34dd25de9fe3 ("powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops")
> 682e6b4da5cb ("rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops")
> 
> == Regression Potential ==
> Low.  The first commit is specific to powerpc.  The second commit is, commit 628daa8d5abf 
> and it been cc'd to upstream stable to fix a regression, so it has had
> additional 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. 
> 
> 
> Nicholas Piggin (2):
>   powerpc/powernv: define a standard delay for OPAL_BUSY type retry
>     loops
>   rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops
> 
>  arch/powerpc/include/asm/opal.h           |  3 +++
>  arch/powerpc/platforms/powernv/opal-rtc.c |  8 ++++---
>  drivers/rtc/rtc-opal.c                    | 37 +++++++++++++++++++------------
>  3 files changed, 31 insertions(+), 17 deletions(-)
> 
Acked-by: Stefan Bader <stefan.bader at canonical.com>

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