linux-kernel - Re: [PATCHv11 6/6] asm-generic/io: Add logging support for MMIO accessors

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Message-ID: <b935102a-3f4b-2b45-b4d3-03b489404b44@quicinc.com>
Date:   Thu, 28 Apr 2022 13:02:01 +0530
From:   Sai Prakash Ranjan <quic_saipraka@...cinc.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <arnd@...db.de>, <catalin.marinas@....com>, <rostedt@...dmis.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <maz@...nel.org>, <quic_psodagud@...cinc.com>,
        <quic_tsoni@...cinc.com>, <will@...nel.org>
Subject: Re: [PATCHv11 6/6] asm-generic/io: Add logging support for MMIO
 accessors

On 4/28/2022 11:23 AM, Greg KH wrote:
> On Thu, Apr 28, 2022 at 09:00:13AM +0530, Sai Prakash Ranjan wrote:
>> Add logging support for MMIO high level accessors such as read{b,w,l,q}
>> and their relaxed versions to aid in debugging unexpected crashes/hangs
>> caused by the corresponding MMIO operation. Also add a generic flag
>> (__DISABLE_TRACE_MMIO__) which is used to disable MMIO tracing in nVHE KVM
>> and if required can be used to disable MMIO tracing for specific drivers.
> Also, this should be split up into 2 patches, one to add the "disable
> the feature" flag, and one to enable it for the specific driver(s) you
> want.
>
> Hint, when you say "also" in a changelog text, that's a huge sign that
> it perhaps should be split up into smaller pieces.
>

Right, will split them.

Thanks,
Sai