From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi•com>
To: "Suzuki K. Poulose" <suzuki@in•ibm.com>
Cc: Jeremy Fitzhardinge <jeremy@goop•org>,
linux-ia64@vger•kernel.org, sparse@chrisli•org,
Linux Kernel Mailing List <linux-kernel@vger•kernel.org>,
Paul Mackerras <paulus@samba•org>,
"H. Peter Anvin" <hpa@zytor•com>,
Thomas Gleixner <tglx@linutronix•de>,
linux-tip-commits@vger•kernel.org,
anil.s.keshavamurthy@intel•com, Ingo Molnar <mingo@kernel•org>,
Fenghua Yu <fenghua.yu@intel•com>, Arnd Bergmann <arnd@arndb•de>,
Rusty Russell <rusty@rustcorp•com.au>,
Chris Wright <chrisw@sous-sol•org>,
yrl.pp-manager.tt@hitachi•com, akataria@vmware•com,
Tony Luck <tony.luck@intel•com>, Kevin Hao <haokexin@gmail•com>,
linuxppc-dev@lists•ozlabs.org, rdunlap@infradead•org,
Tony Luck <tony.luck@gmail•com>,
dl9pf@gmx•de, Andrew Morton <akpm@linux-foundation•org>,
Linus Torvalds <torvalds@linux-foundation•org>,
"David S. Miller" <davem@davemloft•net>
Subject: Re: Re: Re: [RFT PATCH -next v3] [BUGFIX] kprobes: Fix "Failed to find blacklist" error on ia64 and ppc64
Date: Thu, 19 Jun 2014 20:20:45 +0900 [thread overview]
Message-ID: <53A2C78D.9060708@hitachi.com> (raw)
In-Reply-To: <53A2C315.9030006@hitachi.com>
(2014/06/19 20:01), Masami Hiramatsu wrote:
>>>>> Ah, those messages should be shown in dmesg when booting if it doesn't work,
>>>>> because the messages are printed by initialization process of kprobe blacklist.
>>>>> So, reproducing it is just enabling CONFIG_KPROBES and boot it.
>>>> Well, we don't get those messages on Power, since the kallsyms has the
>>>> entries for ".function_name". The correct way to verify is, either :
>>>
>>> Hmm, that seems another issue on powerpc. Is that expected(and designed)
>>> behavior?
>> AFAIK, yes, it is.
>> To be more precise :
>>
>> we have 'foo' and '.foo' for a function foo(), where 'foo' points to the
>> function_entry and '.foo' points to the actual function.
>
> Ah, I see. So if we run
>
> func_ptr p = foo;
> return p == kallsyms_lookup_name(".foo");
>
> it returns true.
One more thing I should know, is the address of ".function_name" within the
kernel text? In other words, does kernel_text_address() return true for that
address? If not, it's easy to verify the address.
Thank you,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi•com
next prev parent reply other threads:[~2014-06-19 11:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <536A16A6.5040709@hitachi.com>
2014-05-07 11:55 ` [RFT PATCH -next ] [BUGFIX] kprobes: Fix "Failed to find blacklist" error on ia64 and ppc64 Masami Hiramatsu
2014-05-07 11:59 ` Masami Hiramatsu
2014-05-14 8:19 ` Masami Hiramatsu
2014-05-08 4:47 ` Ananth N Mavinakayanahalli
2014-05-08 5:40 ` Masami Hiramatsu
2014-05-08 6:16 ` Ananth N Mavinakayanahalli
2014-05-09 8:06 ` Masami Hiramatsu
2014-05-26 11:25 ` Suzuki K. Poulose
2014-05-26 11:48 ` Masami Hiramatsu
2014-05-27 6:31 ` [RFT PATCH -next v2] " Masami Hiramatsu
2014-05-29 19:13 ` Suzuki K. Poulose
2014-05-30 2:47 ` Masami Hiramatsu
2014-05-30 3:18 ` [RFT PATCH -next v3] " Masami Hiramatsu
2014-06-06 6:38 ` Masami Hiramatsu
2014-06-17 23:03 ` Tony Luck
2014-06-18 7:56 ` Michael Ellerman
2014-06-18 8:46 ` Masami Hiramatsu
2014-06-19 1:30 ` Michael Ellerman
2014-06-19 4:52 ` Masami Hiramatsu
2014-06-19 6:40 ` Suzuki K. Poulose
2014-06-19 7:26 ` Masami Hiramatsu
2014-06-19 9:45 ` Suzuki K. Poulose
2014-06-19 11:01 ` Masami Hiramatsu
2014-06-19 11:20 ` Masami Hiramatsu [this message]
2014-06-20 0:37 ` Michael Ellerman
2014-06-20 2:13 ` Masami Hiramatsu
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