linux-kernel - Re: [PATCH 2/2] uprobes/core: Handle breakpoint and singlestep exception.

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Date:	Tue, 13 Mar 2012 16:35:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/2] uprobes/core: Handle breakpoint and singlestep
 exception.


* Srikar Dronamraju <srikar@...ux.vnet.ibm.com> wrote:

> diff --git a/kernel/fork.c b/kernel/fork.c
> index 26a7a67..36508b9 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -67,6 +67,7 @@
>  #include <linux/oom.h>
>  #include <linux/khugepaged.h>
>  #include <linux/signalfd.h>
> +#include <linux/uprobes.h>
>  
>  #include <asm/pgtable.h>
>  #include <asm/pgalloc.h>
> @@ -731,6 +732,8 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
>  		exit_pi_state_list(tsk);
>  #endif
>  
> +	uprobe_free_utask(tsk);
> +
>  	/* Get rid of any cached register state */
>  	deactivate_mm(tsk, mm);
>  
> @@ -1322,6 +1325,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
>  	INIT_LIST_HEAD(&p->pi_state_list);
>  	p->pi_state_cache = NULL;
>  #endif
> +#ifdef CONFIG_UPROBES
> +	p->utask = NULL;
> +	p->uprobe_srcu_id = -1;
> +#endif
>  	/*
>  	 * sigaltstack should be cleared when sharing the same VM
>  	 */

Hm, I suspect by looking at the first two hunks you can guess 
how the third hunk should be done more cleanly?

Thanks,

	Ingo
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