linux-kernel - Re: [PATCH 1/1] kallsyms: print module name in %ps/S case when KALLSYMS is disabled

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Date:   Wed, 9 Feb 2022 15:02:06 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Petr Mladek <pmladek@...e.com>, Vimal Agrawal <avimalin@...il.com>
Cc:     Maninder Singh <maninder1.s@...sung.com>, rostedt@...dmis.org,
        senozhatsky@...omium.org, andriy.shevchenko@...ux.intel.com,
        linux@...musvillemoes.dk, akpm@...ux-foundation.org,
        wangkefeng.wang@...wei.com, mbenes@...e.cz, swboyd@...omium.org,
        ojeda@...nel.org, linux-kernel@...r.kernel.org, will@...nel.org,
        catalin.marinas@....com, Vaneet Narang <v.narang@...sung.com>,
        Aaron Tomlin <atomlin@...hat.com>
Subject: Re: [PATCH 1/1] kallsyms: print module name in %ps/S case when
 KALLSYMS is disabled

On Wed, Feb 09, 2022 at 12:40:38PM +0100, Petr Mladek wrote:
> > --- a/include/linux/kallsyms.h
> > +++ b/include/linux/kallsyms.h
> > @@ -163,6 +163,33 @@ static inline bool kallsyms_show_value(const struct cred *cred)
> >  	return false;
> >  }
> >  
> > +#ifdef CONFIG_MODULES
> > +static inline int fill_minimal_module_info(char *sym, int size, unsigned long value)
> > +{
> > +	struct module *mod;
> > +	unsigned long offset;
> > +	int ret = 0;
> > +
> > +	preempt_disable();
> > +	mod = __module_address(value);
> > +	if (mod) {
> > +		offset = value - (unsigned long)mod->core_layout.base;
> > +		snprintf(sym, size - 1, "0x%lx+0x%lx [%s]",
> > +				(unsigned long)mod->core_layout.base, offset, mod->name);
> > +
> > +		sym[size - 1] = '\0';
> > +		ret = 1;
> > +	}
> > +
> > +	preempt_enable();
> > +	return ret;
> > +}
> 
> It looks too big for an inlined function. Anyway, we will need
> something even more complex, see below.

Interesting, these observations might apply to Vimal's work as well [0].

[0] https://lkml.kernel.org/r/YgKyC4ZRud0JW1PF@bombadil.infradead.org

  Luis