Date: Sun, 14 Apr 2013 18:05:01 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Jan Kratochvil <jan.kratochvil@redhat.com>,
        Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
        Paul Mundt <lethal@linux-sh.org>, Prasad <prasad@linux.vnet.ibm.com>,
        Russell King <linux@arm.linux.org.uk>,
        Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org
Subject: [PATCH 0/5] kill ptrace_{get,put}_breakpoints()
Message-ID: <20130414160501.GA7612@redhat.com>
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Hello.

Kill ptrace_{get,put}_breakpoints and task_struct->ptrace_bp_refcnt,
9899d11f "ptrace: ensure arch_ptrace/ptrace_request can never race
with SIGKILL" made this all unneeded.

Benjamin, Paul, arch_dup_task_struct()->flush_ptrace_hw_breakpoint(src)
on powerpc looks "obviously wrong". Don't we need

	- flush_ptrace_hw_breakpoint(src);
	+ dst->thread->ptrace_bps[0] = NULL;

?

Oleg.

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