APPLIED Z: [PATCH 0/6][SRU Zesty] Miscellaneous arm_arch_timer fixes

Stefan Bader stefan.bader at canonical.com
Fri Sep 15 12:34:51 UTC 2017


On 30.08.2017 19:41, dann frazier wrote:
> BugLink: https://bugs.launchpad.net/bugs/1713821
> 
> I submitted an early version of the arm_arch_timer errata workaround series
> back before zesty and, as promised[*], I've reviewed the changes that were
> made to that series before landing to look for fixes we need to pick up.
> One such fix was in this patch:
>  "arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled"
> which could break the trapping if the user access bit was set at reset.
> For that, I've reverted the early version and replaced it with the upstream
> cherry-pick.
> 
> Another was in this patch:
>  "arm64: arch_timer: Allows a CPU-specific erratum to only affect a subset of CPUs"
> Which, while it doesn't impact Ubuntu today, could if we were to enable
> CNOFIG_PREEMPT_TRACER.
> 
> We're also carrying a backport of the series that enables the SBSA
> watchdog driver - there have been a few fixes to it since it was
> merged, and those are included here as well.
> 
> [*] https://lists.ubuntu.com/archives/kernel-team/2017-March/083134.html
> 
> The following changes since commit 1bfb6eb7ecd64066f0ff2e2a5990ac6bbded1816:
> 
>   UBUNTU: Ubuntu-4.10.0-34.38 (2017-08-28 10:41:02 -0300)
> 
> are available in the git repository at:
> 
>   git://git.launchpad.net/~dannf/ubuntu/+source/linux/+git/linux arm64-arch-timer-fixes-z
> 
> for you to fetch changes up to 5c7cce8036222550a599ed584dce0aa5c6f314a1:
> 
>   clocksource/drivers/arm_arch_timer: Avoid infinite recursion when ftrace is enabled (2017-08-29 16:57:42 -0600)
> 
> ----------------------------------------------------------------
> Ding Tianhong (1):
>       clocksource/drivers/arm_arch_timer: Avoid infinite recursion when ftrace is enabled
> 
> Frank Rowand (1):
>       clocksource/drivers/arm_arch_timer: Fix read and iounmap of incorrect variable
> 
> Marc Zyngier (1):
>       arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled
> 
> Matthias Kaehlcke (1):
>       clocksource/drivers/arm_arch_timer: Fix mem frame loop initialization
> 
> Sudeep Holla (1):
>       clocksource/arm_arch_timer: Fix arch_timer_mem_find_best_frame()
> 
> dann frazier (1):
>       Revert "UBUNTU: SAUCE: arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled"
> 
>  arch/arm64/include/asm/arch_timer.h  |  4 ++--
>  drivers/clocksource/arm_arch_timer.c | 11 ++++++-----
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
Applied to master-next

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