linux-kernel - Re: [PATCH 0/3] dynamic_hex

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Message-ID: <CAPcyv4iqK-3X5ngXs6HjTQhtW0DEu5KsBcgAY1nVJCWPnSagGw@mail.gmail.com>
Date:   Fri, 28 Apr 2017 16:12:29 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Joe Perches <joe@...ches.com>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        linux-remoteproc@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Jason Baron <jbaron@...mai.com>
Subject: Re: [PATCH 0/3] dynamic_hex_dump cleanup

On Fri, Apr 28, 2017 at 4:04 PM, Joe Perches <joe@...ches.com> wrote:
> On Fri, 2017-04-28 at 15:59 -0700, Dan Williams wrote:
>> ...but again, hex_dump_dbg() implies to me dev_dbg() behavior, i.e.
>> that the hexdump happens in the KERN_DEBUG case
>
> I think you are confusing KERN_DEBUG, a logging level, with a
> preprocessor #define of DEBUG.

Indeed I am.

>
>>  which I don't want. I
>> want the call to be compiled out completely when it can't be
>> enabled/disabled dynamically.
>
> dev_dbg is compiled away completely when DEBUG is
> not defined and when CONFIG_DYNAMIC_DEBUG is not
> defined.
>
> This hex_dump facility should behave the same way.
>
>> I think we do need a hex_dump_dbg(), but that does not eliminate the
>> utility of / need for dynamic_hex_dump().
>
> dynamic_hex_dump should only exist when CONFIG_DYNAMIC_DEBUG
> is enabled and should otherwise be invisible to driver code.
>

So, I overlooked that Linus fixed this compile problem a while back with:

cdf17449af1d hexdump: do not print debug dumps for !CONFIG_DEBUG

Which predated the introduction of ACPI_NFIT_DEBUG. So I can just call
print_hex_dump_debug() and call it a day.

Sorry for the noise, Joe!