From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Jason Baron <jbaron@redhat.com>
Subject: Re: [PATCH 4/9] jump label: Fix deadlock b/w jump_label_mutex vs. text_mutex
Date: Fri, 15 Oct 2010 22:55:34 +0200 [thread overview]
Message-ID: <1287176134.1998.113.camel@laptop> (raw)
In-Reply-To: <20101015201036.691801067@goodmis.org>
On Fri, 2010-10-15 at 16:09 -0400, Steven Rostedt wrote:
> +void jump_label_lock(void)
> +{
> + mutex_lock(&jump_label_mutex);
> +}
> +
> +++ b/kernel/kprobes.c
> @@ -1145,13 +1145,16 @@ int __kprobes register_kprobe(struct kprobe *p)
> return ret;
>
> preempt_disable();
> + jump_label_lock();
How exactly does that work?
> if (!kernel_text_address((unsigned long) p->addr) ||
> in_kprobes_functions((unsigned long) p->addr) ||
> ftrace_text_reserved(p->addr, p->addr) ||
> jump_label_text_reserved(p->addr, p->addr)) {
> preempt_enable();
> + jump_label_unlock();
> return -EINVAL;
> }
> + jump_label_unlock();
next prev parent reply other threads:[~2010-10-15 20:56 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-15 20:09 [PATCH 0/9] [GIT PULL] jump label: various updates Steven Rostedt
2010-10-15 20:09 ` [PATCH 1/9] jump label/x86: Move arch_init_ideal_nop5 later Steven Rostedt
2010-10-15 20:09 ` [PATCH 2/9] tracing/x86: No need to disable interrupts when calling arch_init_ideal_nop5 Steven Rostedt
2010-10-15 20:09 ` [PATCH 3/9] jump label: Fix module __init section race Steven Rostedt
2010-10-16 2:09 ` Steven Rostedt
2010-10-16 6:23 ` Ingo Molnar
2010-10-16 16:23 ` Steven Rostedt
2010-10-18 14:14 ` Jason Baron
2010-10-15 20:09 ` [PATCH 4/9] jump label: Fix deadlock b/w jump_label_mutex vs. text_mutex Steven Rostedt
2010-10-15 20:55 ` Peter Zijlstra [this message]
2010-10-16 2:16 ` Steven Rostedt
2010-10-16 2:25 ` Steven Rostedt
2010-10-16 4:21 ` Steven Rostedt
2010-10-15 20:09 ` [PATCH 5/9] jump label: Add register_jump_label_key/unregister_jump_label_key Steven Rostedt
2010-10-15 20:58 ` Peter Zijlstra
2010-10-16 2:11 ` Steven Rostedt
2010-10-15 21:03 ` Peter Zijlstra
2010-10-15 21:09 ` Steven Rostedt
2010-10-15 21:13 ` Peter Zijlstra
2010-10-18 12:05 ` Peter Zijlstra
2010-10-18 14:03 ` Jason Baron
2010-10-18 14:07 ` Peter Zijlstra
2010-10-15 20:09 ` [PATCH 6/9] jump label: Move jump table to r/w section Steven Rostedt
2010-10-15 20:09 ` [PATCH 7/9] jump label: Add docs Steven Rostedt
2010-10-15 20:09 ` [PATCH 8/9] jump label: Make arch_jump_label_text_poke_early() optional Steven Rostedt
2010-10-15 21:06 ` Peter Zijlstra
2010-10-15 21:08 ` Steven Rostedt
2010-10-15 21:22 ` David Daney
2010-10-15 21:35 ` Steven Rostedt
2010-10-15 21:38 ` David Daney
2010-10-16 1:08 ` Steven Rostedt
2010-10-30 10:40 ` [tip:perf/urgent] " tip-bot for Steven Rostedt
2010-10-15 20:09 ` [PATCH 9/9] jump label: Add MIPS support Steven Rostedt
2010-10-15 20:17 ` [PATCH 0/9] [GIT PULL] jump label: various updates Steven Rostedt
2010-10-16 1:10 ` Steven Rostedt
-- strict thread matches above, loose matches on Subject: below --
2010-10-04 18:56 [PATCH v2 0/2] jump label: Add MIPS architecture support David Daney
2010-10-04 18:56 ` [PATCH v2 1/2] jump label: Make arch_jump_label_text_poke_early() optional David Daney
2010-10-04 18:56 ` [PATCH v2 2/2] jump label: Add MIPS support David Daney
2010-10-06 23:00 ` Ralf Baechle
2010-10-07 1:26 ` David Daney
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