linux-kernel - Re: [PATCH v2 06/13] s390/time: Provide sched_clock

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Date:   Mon, 22 May 2023 16:18:41 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     bigeasy@...utronix.de, mark.rutland@....com, maz@...nel.org,
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Subject: Re: [PATCH v2 06/13] s390/time: Provide sched_clock_noinstr()

On Fri, May 19, 2023 at 12:21:04PM +0200, Peter Zijlstra wrote:
> With the intent to provide local_clock_noinstr(), a variant of
> local_clock() that's safe to be called from noinstr code (with the
> assumption that any such code will already be non-preemptible),
> prepare for things by providing a noinstr sched_clock_noinstr()
> function.
> 
> Specifically, preempt_enable_*() calls out to schedule(), which upsets
> noinstr validation efforts.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/s390/include/asm/timex.h |   13 +++++++++----
>  arch/s390/kernel/time.c       |   11 ++++++++++-
>  2 files changed, 19 insertions(+), 5 deletions(-)

Acked-by: Heiko Carstens <hca@...ux.ibm.com>