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Date: Fri, 15 Oct 2010 22:55:34 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...ux-foundation.org>, Frederic Weisbecker <fweisbec@...il.com>, Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, Jason Baron <jbaron@...hat.com> Subject: Re: [PATCH 4/9] jump label: Fix deadlock b/w jump_label_mutex vs. text_mutex 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(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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