linux-kernel - Re: [PATCH v5 05/13] module: Add printk formats to add module build ID to stacktraces

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Message-ID: <YILKpQ2KsBXCoHlG@smile.fi.intel.com>
Date:   Fri, 23 Apr 2021 16:24:53 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-doc@...r.kernel.org, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v5 05/13] module: Add printk formats to add module build
 ID to stacktraces

On Thu, Apr 22, 2021 at 04:46:40PM -0700, Stephen Boyd wrote:
> Quoting Andy Shevchenko (2021-04-21 04:49:33)
> > On Tue, Apr 20, 2021 at 02:49:55PM -0700, Stephen Boyd wrote:

...

> > > Example:
> > 
> > Please, shrink the example to leave only meaningful lines.
> > 
> > Why, e.g., do we need to see register dump, is it somehow different?
> 
> Can you format it how you would like to see it? Should it be a unified
> diff? I agree it would help to see "what changed" but also don't know
> what you want so opted to provide more information, not less. I was
> worried about the questions like "do you change other parts of a splat?"
> so I just put the whole thing there.


Before:
 ...line X...
 ...
 ...line Y...

After:
 ...line X'...
 ...
 ...line Y'...

Three lines of example per each paragraph, in each of them the middle one is
simply [...].

...

> > > +#ifdef CONFIG_STACKTRACE_BUILD_ID
> > > +     /* Module build ID */
> > > +     unsigned char build_id[BUILD_ID_SIZE_MAX];
> > 
> > Is it really string of characters? Perhaps u8 will be more explicit.
> 
> I'm just matching the build ID API that uses unsigned char. If you want
> u8 then we should update more places. I could do that in a followup
> patch, but this one is already sorta big.

Unsigned char here is confusing. I would prefer a prerequisite patch to fix
other places first.

...

> > > +#include <linux/kernel.h>
> > 
> > What do you need this header for?
> > 
> 
> For typeof_member().

Argh... We really need to split this and container_of to something else. Having
entire kernel.h for that is an overkill.

-- 
With Best Regards,
Andy Shevchenko