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Date:   Mon, 1 Feb 2021 12:47:49 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Petr Mladek <pmladek@suse.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Frederic Barrat <fbarrat@linux.ibm.com>,
        Andrew Donnellan <ajd@linux.ibm.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>, Jessica Yu <jeyu@kernel.org>,
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        Jiri Kosina <jikos@kernel.org>,
        Miroslav Benes <mbenes@suse.cz>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
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        linux-kbuild@vger.kernel.org
Subject: Re: [PATCH 05/13] kallsyms: refactor
 {,module_}kallsyms_on_each_symbol
Message-ID: <20210201114749.GB19696@lst.de>
References: <20210128181421.2279-1-hch@lst.de> <20210128181421.2279-6-hch@lst.de> <YBPYyEvesLMrRtZM@alley>
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On Fri, Jan 29, 2021 at 10:43:36AM +0100, Petr Mladek wrote:
> > --- a/kernel/livepatch/core.c
> > +++ b/kernel/livepatch/core.c
> > @@ -164,12 +164,8 @@ static int klp_find_object_symbol(const char *objname, const char *name,
> >  		.pos = sympos,
> >  	};
> >  
> > -	mutex_lock(&module_mutex);
> > -	if (objname)
> > +	if (objname || !kallsyms_on_each_symbol(klp_find_callback, &args))
> >  		module_kallsyms_on_each_symbol(klp_find_callback, &args);
> > -	else
> > -		kallsyms_on_each_symbol(klp_find_callback, &args);
> > -	mutex_unlock(&module_mutex);
> 
> This change is not needed. (objname == NULL) means that we are
> interested only in symbols in "vmlinux".
> 
> module_kallsyms_on_each_symbol(klp_find_callback, &args)
> will always fail when objname == NULL.

I just tried to keep the old behavior.  I can respin it with your
recommended change noting the change in behavior, though.