linux-kernel - Re: [PATCH v6 05/13] module: Add printk formats to add module build ID to stacktraces

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Date:   Tue, 11 May 2021 09:51:54 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Petr Mladek <pmladek@...e.com>
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>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-doc@...r.kernel.org, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v6 05/13] module: Add printk formats to add module build
 ID to stacktraces

Quoting Petr Mladek (2021-05-11 04:35:21)
> On Mon 2021-05-10 17:38:37, Stephen Boyd wrote:
> > Let's make kernel stacktraces easier to identify by including the build
> > ID[1] of a module if the stacktrace is printing a symbol from a module.
>
> > --- a/include/linux/module.h
> > +++ b/include/linux/module.h
> > @@ -11,6 +11,7 @@
> >
> >  #include <linux/list.h>
> >  #include <linux/stat.h>
> > +#include <linux/buildid.h>
> >  #include <linux/compiler.h>
> >  #include <linux/cache.h>
> >  #include <linux/kmod.h>
> > @@ -364,6 +365,11 @@ struct module {
> >       /* Unique handle for this module */
> >       char name[MODULE_NAME_LEN];
> >
> > +#ifdef CONFIG_STACKTRACE_BUILD_ID
> > +     /* Module build ID */
> > +     unsigned char build_id[BUILD_ID_SIZE_MAX];
> > +#endif
> > +
> >       /* Sysfs stuff. */
> >       struct module_kobject mkobj;
> >       struct module_attribute *modinfo_attrs;
> > @@ -627,7 +633,7 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr);
> >  const char *module_address_lookup(unsigned long addr,
> >                           unsigned long *symbolsize,
> >                           unsigned long *offset,
> > -                         char **modname,
> > +                         char **modname, const unsigned char **modbuildid,
>
> Nit: It would have been better to follow the existing style and put only one
>      parameter per-line.
>
> Please, fix it in the next version if there is any. But no need
> to resend it just because of this unless Jessica asks for it.

Thanks. akpm already picked this series up and fixed this problem.