linux-kernel - Re: [PATCH 3/5] ptrace/arm: Revert "hw_breakpoints: Fix racy access to ptrace breakpoints"

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Message-ID: <20130416084624.GB30756@mudshark.cambridge.arm.com>
Date:	Tue, 16 Apr 2013 09:46:24 +0100
From:	Will Deacon <will.deacon@....com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] ptrace/arm: Revert "hw_breakpoints: Fix racy access
 to ptrace breakpoints"

On Sun, Apr 14, 2013 at 05:05:34PM +0100, Oleg Nesterov wrote:
> This reverts commit bf0b8f4b55e591ba417c2dbaff42769e1fc773b0.
> 
> The patch was fine but we can no longer race with SIGKILL after
> 9899d11f "ptrace: ensure arch_ptrace/ptrace_request can never race
> with SIGKILL", the __TASK_TRACED tracee can't be woken up and
> ->ptrace_bps[] can't go away.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  arch/arm/kernel/ptrace.c |    8 --------
>  1 files changed, 0 insertions(+), 8 deletions(-)

Looks fine to me. Seems as though I missed arch/arm64/, so nothing to change
there.

  Acked-by: Will Deacon <will.deacon@....com>

Will
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