linux-kernel - Re: [PATCH] platform/x86: wmi: Fix printing info about WDG structure

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Message-ID: <CAHp75VfkudDRNTh9dR=y4G5HD+OaPoxjxVZgw6=9-YpOn4sJSA@mail.gmail.com>
Date:   Sat, 27 May 2017 16:33:14 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: wmi: Fix printing info about WDG structure

On Sat, May 27, 2017 at 4:17 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> On Saturday 27 May 2017 15:07:09 Andy Shevchenko wrote:
>> On Sat, May 27, 2017 at 2:51 PM, Pali Rohár <pali.rohar@...il.com>
>> wrote:

>> > Remove
>> > also reserved member as it does not have any defined meaning or
>> > type yet.

>> > -       pr_info("\treserved: %02X\n", g->reserved);
>>
>> Do we need this? Commit message doesn't clarify.
>
> I wrote to commit message that reserved does not have defined meaning
> nor type. Also reserved overlap with object_id[1] so for non-event
> should not be print at all. And as it is reserved, I removed it.

Oh, indeed.

>> > +               pr_info("\tobject_id: %c%c\n", g->object_id[0],
>> > g->object_id[1]);
>>
>> If this can still contain non-printable characters the %*pE can help
>> instead.
>
> Those are printable ASCII. object_id contains two characters which are
> suffix for ACPI method.
>
> Problem was only for events when we tried to print notify_id as
> object_id. notify_id is binary and overlaps with object_id.

Okay, got it. But on your opinion does it make sense to do

pr_info("\tobject_id: %2pE\n", g->object_id);

instead?

For ASCII it will go as is previously, otherwise escaping would be done.

-- 
With Best Regards,
Andy Shevchenko