linux-kernel - Re: [PATCH 09/10] uprobes: Change prepare_uretprobe() to (try to) flush the dead frames

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Date:	Thu, 7 May 2015 16:49:03 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <arapov@...il.com>,
	David Long <dave.long@...aro.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jan Willeke <willeke@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	Pratyush Anand <panand@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] uprobes: Change prepare_uretprobe() to (try to)
 flush the dead frames

* Oleg Nesterov <oleg@...hat.com> [2015-05-04 14:49:22]:

> Change prepare_uretprobe() to flush the !arch_uretprobe_is_alive()
> return_instance's. This is not needed correctness-wise, but can help
> to avoid the failure caused by MAX_URETPROBE_DEPTH.
> 
> Note: in this case arch_uretprobe_is_alive() can be false positive,
> the stack can grow after longjmp(). Unfortunately, the kernel can't
> 100% solve this problem, but see the next patch.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/events/uprobes.c |   13 +++++++++++++

Looks good to me.

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
-- 
Thanks and Regards
Srikar Dronamraju

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