linux-kernel - Re: [RFT PATCH -next v3] [BUGFIX] kprobes: Fix "Failed to find blacklist" error on ia64 and ppc64

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Message-ID: <CA+8MBbJ=piCBmiN_=ycN_kQ4LbZcjz7UXR2Bbohd6z67mghmZg@mail.gmail.com>
Date:	Tue, 17 Jun 2014 16:03:59 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	sparse@...isli.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-tip-commits@...r.kernel.org, anil.s.keshavamurthy@...el.com,
	Ingo Molnar <mingo@...nel.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Chris Wright <chrisw@...s-sol.org>,
	yrl.pp-manager.tt@...achi.com, akataria@...are.com,
	Kevin Hao <haokexin@...il.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, rdunlap@...radead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dl9pf@....de, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [RFT PATCH -next v3] [BUGFIX] kprobes: Fix "Failed to find
 blacklist" error on ia64 and ppc64

On Thu, Jun 5, 2014 at 11:38 PM, Masami Hiramatsu
<masami.hiramatsu.pt@...achi.com> wrote:
> Ping?
>
> I guess this should go to 3.16 branch, shouldn't it?
>
> (2014/05/30 12:18), Masami Hiramatsu wrote:
>> On ia64 and ppc64, the function pointer does not point the
>> entry address of the function, but the address of function
>> discriptor (which contains the entry address and misc
>> data.) Since the kprobes passes the function pointer stored
>> by NOKPROBE_SYMBOL() to kallsyms_lookup_size_offset() for
>> initalizing its blacklist, it fails and reports many errors
>> as below.
>>
>>   Failed to find blacklist 0001013168300000

Yes please ... just found this problem on ia64 in mainline
and was happy to see this fix for it.

Tested-by: Tony Luck <tony.luck@...el.com>

-Tony
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