linux-kernel - Re: [PATCH 05/14] KDB: add more exports for supporting KDB modules

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Date:	Tue, 12 Mar 2013 13:09:39 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Mike Travis <travis@....com>
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	Dimitri Sivanich <sivanich@....com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kgdb-bugreport@...ts.sourceforge.net, x86@...nel.org,
	linux-kernel@...r.kernel.org, Tim Bird <tim.bird@...sony.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Cong Wang <amwang@...hat.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH 05/14] KDB: add more exports for supporting KDB modules

Mike Travis <travis@....com> writes:

> This patch adds some important KDB functions to be externally
> usable by loadable KDB modules.  Note that often drivers bring
> in KDB modules for debugging, and in the past KDB has not been
> limited to use by GPL only modules.  This patch restores KDB
> usefullness to non-GPL modules.

It is not ok to change EXPORT_SYMBOL_GPL to EXPORT_SYMBOL.

The symbols you are changing to EXPORT_SYMBOL from EXPORT_SYMBOL_GPL you
should not even be messing with if your source code is not in the main
kernel tree.

This patch is totally not ok.

I don't know what past you are referring to but you are changing symbols
that have never been exported as anything other than EXPORT_SYMBOL_GPL
to EXPORT_SYMBOL.  The past I remember is the past where kdb was not in
the kernel tree at all.

Please go back to the drawing board and come back with a solution where
you are working with the community instead of trying asking the rest of
us to support something you won't share.

Nacked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

> --- linux.orig/kernel/signal.c
> +++ linux/kernel/signal.c
> @@ -1419,7 +1419,7 @@ out_unlock:
>  	rcu_read_unlock();
>  	return ret;
>  }
> -EXPORT_SYMBOL_GPL(kill_pid_info_as_cred);
> +EXPORT_SYMBOL(kill_pid_info_as_cred);
>  
>  /*
>   * kill_something_info() interprets pid in interesting ways just like kill(2).
> @@ -2491,7 +2491,7 @@ out:
>  }
>  
>  EXPORT_SYMBOL(recalc_sigpending);
> -EXPORT_SYMBOL_GPL(dequeue_signal);
> +EXPORT_SYMBOL(dequeue_signal);
>  EXPORT_SYMBOL(flush_signals);
>  EXPORT_SYMBOL(force_sig);
>  EXPORT_SYMBOL(send_sig);
> @@ -3661,4 +3661,5 @@ kdb_send_sig_info(struct task_struct *t,
>  	else
>  		kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
>  }
> +EXPORT_SYMBOL(kdb_send_sig_info);
>  #endif	/* CONFIG_KGDB_KDB */
--
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