linux-kernel - Re: [PATCH v2 2.6.38-rc8-tip 11/20] 11: uprobes: slot allocation for uprobes

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Message-ID: <20110315203117.GA27063@fibrous.localdomain>
Date:	Tue, 15 Mar 2011 16:31:17 -0400
From:	Stephen Wilson <wilsons@...rt.ca>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	SystemTap <systemtap@...rces.redhat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 11/20] 11: uprobes: slot allocation
	for uprobes


On Mon, Mar 14, 2011 at 07:06:10PM +0530, Srikar Dronamraju wrote:
> diff --git a/kernel/fork.c b/kernel/fork.c
> index de3d10a..0afa0cd 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -551,6 +551,7 @@ void mmput(struct mm_struct *mm)
>  	might_sleep();
>  
>  	if (atomic_dec_and_test(&mm->mm_users)) {
> +		uprobes_free_xol_area(mm);
>  		exit_aio(mm);
>  		ksm_exit(mm);
>  		khugepaged_exit(mm); /* must run before exit_mmap */
> @@ -677,6 +678,9 @@ struct mm_struct *dup_mm(struct task_struct *tsk)
>  	memcpy(mm, oldmm, sizeof(*mm));
>  
>  	/* Initializing for Swap token stuff */
> +#ifdef CONFIG_UPROBES
> +	mm->uprobes_xol_area = NULL;
> +#endif
>  	mm->token_priority = 0;
>  	mm->last_interval = 0;

Perhaps move the uprobes_xol_area initialization away from that comment?
A few lines down beside the hugepage #ifdef would read a bit better.


-- 
steve

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