* [PATCH PREEMPT_RT 4.19 STABLE] rt: PREEMPT_RT safety net for backported patches
@ 2022-01-30 21:46 Clark Williams
2022-01-31 10:23 ` Sebastian Andrzej Siewior
0 siblings, 1 reply; 2+ messages in thread
From: Clark Williams @ 2022-01-30 21:46 UTC (permalink / raw)
To: Steven Rostedt, Sebastian Andrzej Siewior
Cc: Thomas Gleixner, linux-rt-users, williams, linux-kernel
While doing some 4.19-rt cleanup work, I stumbled across the fact that parts of
two backported patches were dependent on CONFIG_PREEMPT_RT, rather than
the CONFIG_PREEMPT_RT_FULL used in 4.19 and earlier RT series. The commits
in the linux-stable-rt v4.19-rt branch are:
dad4c6a33bf4e mm: slub: Don't resize the location tracking cache on PREEMPT_RT
e626b6f873f2c net: Treat __napi_schedule_irqoff() as __napi_schedule() on PREEMPT_RT
Discussing this at the Stable RT maintainers meeting, Steven Rostedt suggested that
we automagically select CONFIG_PREEMPT_RT if CONFIG_PREEMPT_RT_FULL is on, giving
us a safety net for any subsequently backported patches. Here's my first cut at
that patch.
I suspect we'll need a similar patch for stable RT kernels < 4.19.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Clark Williams <williams@redhat.com>
---
kernel/Kconfig.preempt | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 306567f72a3e..951f58cbd652 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -6,6 +6,10 @@ config PREEMPT_RT_BASE
bool
select PREEMPT
+config PREEMPT_RT
+ bool
+ default false
+
config HAVE_PREEMPT_LAZY
bool
@@ -80,6 +84,7 @@ config PREEMPT_RT_FULL
depends on IRQ_FORCED_THREADING
select PREEMPT_RT_BASE
select PREEMPT_RCU
+ select PREEMPT_RT
help
All and everything
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH PREEMPT_RT 4.19 STABLE] rt: PREEMPT_RT safety net for backported patches
2022-01-30 21:46 [PATCH PREEMPT_RT 4.19 STABLE] rt: PREEMPT_RT safety net for backported patches Clark Williams
@ 2022-01-31 10:23 ` Sebastian Andrzej Siewior
0 siblings, 0 replies; 2+ messages in thread
From: Sebastian Andrzej Siewior @ 2022-01-31 10:23 UTC (permalink / raw)
To: Clark Williams
Cc: Steven Rostedt, Thomas Gleixner, linux-rt-users, williams, linux-kernel
On 2022-01-30 15:46:27 [-0600], Clark Williams wrote:
> While doing some 4.19-rt cleanup work, I stumbled across the fact that parts of
> two backported patches were dependent on CONFIG_PREEMPT_RT, rather than
> the CONFIG_PREEMPT_RT_FULL used in 4.19 and earlier RT series. The commits
> in the linux-stable-rt v4.19-rt branch are:
>
> dad4c6a33bf4e mm: slub: Don't resize the location tracking cache on PREEMPT_RT
> e626b6f873f2c net: Treat __napi_schedule_irqoff() as __napi_schedule() on PREEMPT_RT
>
> Discussing this at the Stable RT maintainers meeting, Steven Rostedt suggested that
> we automagically select CONFIG_PREEMPT_RT if CONFIG_PREEMPT_RT_FULL is on, giving
> us a safety net for any subsequently backported patches. Here's my first cut at
> that patch.
>
> I suspect we'll need a similar patch for stable RT kernels < 4.19.
>
> Suggested-by: Steven Rostedt <rostedt@goodmis.org>
> Signed-off-by: Clark Williams <williams@redhat.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
> kernel/Kconfig.preempt | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
> index 306567f72a3e..951f58cbd652 100644
> --- a/kernel/Kconfig.preempt
> +++ b/kernel/Kconfig.preempt
> @@ -6,6 +6,10 @@ config PREEMPT_RT_BASE
> bool
> select PREEMPT
>
> +config PREEMPT_RT
> + bool
> + default false
default is false.
> +
> config HAVE_PREEMPT_LAZY
> bool
>
Sebastian
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2022-01-30 21:46 [PATCH PREEMPT_RT 4.19 STABLE] rt: PREEMPT_RT safety net for backported patches Clark Williams
2022-01-31 10:23 ` Sebastian Andrzej Siewior
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