From: Masami Hiramatsu <mhiramat@redhat.com>
To: Adrian Bunk <bunk@kernel.org>
Cc: ananth@in.ibm.com, anil.s.keshavamurthy@intel.com,
davem@davemloft.net, bugme-daemon@bugzilla.kernel.org,
jean-marc LACROIX <jeanmarc.lacroix@free.Fr>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [Bug 10489] Kprobe smoke test lockdep warning
Date: Mon, 21 Apr 2008 18:54:12 -0400 [thread overview]
Message-ID: <480D1B14.7070806@redhat.com> (raw)
In-Reply-To: <20080421150656.GJ6011@cs181133002.pp.htv.fi>
Thank you for reporting.
Actually, kprobes tries to fixup thread's flags in post_kprobe_handler
(which is called from kprobe_exceptions_notify) by
trace_hardirqs_fixup_flags(pt_regs->flags). However, even the irq flag
is set in pt_regs->flags, true hardirq is still off until returning
from do_debug. Thus, lockdep assumes that hardirq is off without annotation.
IMHO, one possible solution is that fixing hardirq flags right after
notify_die in do_debug instead of in post_kprobe_handler.
Thanks,
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
next prev parent reply other threads:[~2008-04-21 22:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-21 15:06 [Bug 10489] Kprobe smoke test lockdep warning Adrian Bunk
2008-04-21 15:13 ` Vegard Nossum
2008-04-21 22:54 ` Masami Hiramatsu [this message]
2008-04-22 13:09 ` Peter Zijlstra
2008-04-22 13:26 ` Peter Zijlstra
2008-04-22 15:25 ` Masami Hiramatsu
2008-04-22 16:05 ` Peter Zijlstra
2008-04-22 16:23 ` Masami Hiramatsu
2008-04-22 19:51 ` Masami Hiramatsu
2008-04-22 16:18 ` Masami Hiramatsu
2008-07-15 9:19 ` Ingo Molnar
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