linux-kernel - Re: [PATCH v2 11/11] drivers/edac: convert pci counters to counter

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Message-ID: <202010071128.BBAF7138C6@keescook>
Date:   Wed, 7 Oct 2020 11:28:11 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     bp@...en8.de, mchehab@...nel.org, tony.luck@...el.com,
        james.morse@....com, rric@...nel.org, gregkh@...uxfoundation.org,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v2 11/11] drivers/edac: convert pci counters to
 counter_atomic32

On Tue, Oct 06, 2020 at 02:44:42PM -0600, Shuah Khan 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.
> 
> atomic_t variables used for pci counters keep track of pci parity and
> non-parity errors. Convert them to use counter_atomic32.
> 
> Overflow will wrap around and reset the counts as was the case prior to
> the conversion.
> 
> Acked-by: Borislav Petkov <bp@...e.de>
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>

Looks like pure logging. :)

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook