linux-kernel - Re: [RFC PATCH 05/11] drivers/acpi: convert seqno counter

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Date:   Thu, 24 Sep 2020 17:32:36 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 05/11] drivers/acpi: convert seqno counter_atomic

On Thu, Sep 24, 2020 at 5:08 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>
> On 9/24/20 5:13 AM, Rafael J. Wysocki wrote:
> > On Wed, Sep 23, 2020 at 3:44 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
> >>
> >> counter_atomic is introduced to be used when a variable is used as
> >> a simple counter and doesn't guard object lifetimes. This clearly
> >> differentiates atomic_t usages that guard object lifetimes.
> >>
> >> counter_atomic variables will wrap around to 0 when it overflows and
> >> should not be used to guard resource lifetimes, device usage and
> >> open counts that control state changes, and pm states.
> >>
> >> seqno is a sequence number counter for logging. This counter gets
> >> incremented. Unsure if there is a chance of this overflowing. It
> >> doesn't look like overflowing causes any problems since it is used
> >> to tag the log messages and nothing more.
> >>
> >> Convert it to use counter_atomic.
> >>
> >> This conversion doesn't change the oveflow wrap around behavior.
>
> I see typo here. Will fix it.
>
> >>
> >> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> >
> > Both this change and the next patch are fine by me.
> >
>
> Thanks Rafael. Okay to add your Acked-by?

Sure.

Thanks!