linux-kernel - Re: [PATCH] kgdb: more barrier in blank weak function

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Message-ID: <20081227081737.GA26218@elte.hu>
Date:	Sat, 27 Dec 2008 09:17:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	David Howells <dhowells@...hat.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	mel@....ul.ie
Subject: Re: [PATCH] kgdb: more barrier in blank weak function


* Yinghai Lu <yinghai@...nel.org> wrote:

> Impact: fix panic possible panic etc
> 
> some compiler seems to inline the weak global function if no line in it

>  kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
>  {
> -	return;
> +	barrier();
>  }

>  void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
>  {
> +	barrier();
>  }

seems like the barrier() is not enough - the only safe sequence seems to 
be to turn it into a function that returns an integer.

	Ingo
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