linux-kernel - Re: [RFC PATCH] dynamic_debug: Add config option of DYNAMIC_DEBUG

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Date:   Thu, 19 Mar 2020 04:11:45 +0800
From:   Orson Zhai <orsonzhai@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Orson Zhai <orson.unisoc@...il.com>,
        Jason Baron <jbaron@...mai.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Changbin Du <changbin.du@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ard Biesheuvel <ardb@...nel.org>,
        Gary Hook <Gary.Hook@....com>, David Gow <davidgow@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RFC PATCH] dynamic_debug: Add config option of DYNAMIC_DEBUG_CORE

On Thu, Mar 19, 2020 at 3:23 AM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Wed, Mar 18, 2020 at 9:04 PM Orson Zhai <orson.unisoc@...il.com> wrote:
> >
> > There is the requirement from new Android that kernel image (GKI) and
> > kernel modules are supposed to be built at differnet places. Some people
> > want to enable dynamic debug for kernel modules only but not for kernel
> > image itself with the consideration of binary size increased or more
> > memory being used.
> >
> > By this patch, dynamic debug is divided into core part (the defination of
> > functions) and macro replacement part. We can only have the core part to
> > be built-in and do not have to activate the debug output from kenrel image.
> >
>
> There are few grammar typos in above...

I am very sorry about this. I though check-patch would remind me, but
it seems not. I'll check this carefully next time.

> >  config DYNAMIC_DEBUG
> >         bool "Enable dynamic printk() support"
> >         default n
>
> > -       depends on PRINTK
> > -       depends on DEBUG_FS
>
> You may not touch this. By removing them you effectively removed
> dependencies :-(

OK. I thought dependencies it could be inherited from the selected one.
But I believe you are right. It's not necessary to be removed.
I will add it back at next version.


>
> > +       select DYNAMIC_DEBUG_CORE
> >         help
> >
> >           Compiles debug level messages into the kernel, which would not
> > @@ -164,6 +163,21 @@ config DYNAMIC_DEBUG
> >           See Documentation/admin-guide/dynamic-debug-howto.rst for additional
> >           information.
> >
> > +config DYNAMIC_DEBUG_CORE
> > +       bool "Enable core functions of dynamic debug support"
> > +       depends on PRINTK
> > +       depends on DEBUG_FS
> > +       help
> > +         Enable this option to build ddebug_* and __dynamic_* routines
> > +         into kernel. If you want enable whole dynamic debug features,
> > +         select CONFIG_DYNAMIC_DEBUG directly and this option will be
> > +         automatically selected.
> > +
> > +         This option is selected when you want to enable dynamic debug
>
> > +         for kernel modules only but not for the kernel base. Especailly
>
> Typo.

Will be fixed next version.

>
> > +         in the case that kernel modules are built out of the place where
> > +         kernel base is built.
>
> Highly recommend to ask somebody to do proof read.

Sorry again.

Thanks for your review.

Best Regards,
-Orson
>
> --
> With Best Regards,
> Andy Shevchenko