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Message-ID: <BYAPR21MB16881F78BE5B6D9E9846A438D77CA@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Fri, 19 May 2023 18:38:37 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        "bigeasy@...utronix.de" <bigeasy@...utronix.de>
CC:     Mark Rutland <Mark.Rutland@....com>,
        "maz@...nel.org" <maz@...nel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
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        "kernel@...0n.name" <kernel@...0n.name>,
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        Haiyang Zhang <haiyangz@...rosoft.com>,
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        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: RE: [PATCH v2 09/13] clocksource: hyper-v: Adjust
 hv_read_tsc_page_tsc() to avoid special casing U64_MAX

From: Peter Zijlstra <peterz@...radead.org> Sent: Friday, May 19, 2023 3:21 AM
> 
> Currently hv_read_tsc_page_tsc() (ab)uses the (valid) time value of
> U64_MAX as an error return. This breaks the clean wrap-around of the
> clock.
> 
> Modify the function signature to return a boolean state and provide
> another u64 pointer to store the actual time on success. This obviates
> the need to steal one time value and restores the full counter width.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/x86/include/asm/vdso/gettimeofday.h |   10 ++++++----
>  arch/x86/kvm/x86.c                       |    7 +++----
>  drivers/clocksource/hyperv_timer.c       |   16 +++++++++++-----
>  include/clocksource/hyperv_timer.h       |   24 +++++++++---------------
>  4 files changed, 29 insertions(+), 28 deletions(-)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>

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