linux-kernel - [PATCH 0/5] kill ptrace_{get,put}

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Message-ID: <20130414160501.GA7612@redhat.com>
Date:	Sun, 14 Apr 2013 18:05:01 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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>,
	Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] kill ptrace_{get,put}_breakpoints()

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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