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Date:	Thu, 19 Jun 2014 20:20:45 +0900
From:	Masami Hiramatsu <>
To:	"Suzuki K. Poulose" <>
Cc:	Michael Ellerman <>,
	Benjamin Herrenschmidt <>,
	Tony Luck <>,
	Paul Mackerras <>,
	Jeremy Fitzhardinge <>,,,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>,,,
	Ingo Molnar <>,
	Fenghua Yu <>,
	Arnd Bergmann <>,
	Rusty Russell <>,
	Chris Wright <>,,,
	Tony Luck <>,
	Kevin Hao <>,
	Linus Torvalds <>,,
	Linux Kernel Mailing List <>,, Andrew Morton <>,,
	"David S. Miller" <>
Subject: Re: Re: Re: [RFT PATCH -next v3] [BUGFIX] kprobes: Fix "Failed
 to find blacklist" error on ia64 and ppc64

(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,

Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory

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