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From: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: linux-kernel@vger.kernel.org, acme@kernel.org,
	peterz@infradead.org, mingo@redhat.com,
	alexander.shishkin@linux.intel.com,
	masami.hiramatsu.pt@hitachi.com, wangnan0@huawei.com,
	namhyung@kernel.org, srikar@linux.vnet.ibm.com,
	naveen.n.rao@linux.vnet.ibm.com
Subject: Re: [RFC] perf probe: Fix offline module name missmatch issue
Date: Tue, 26 Apr 2016 14:30:45 +0530	[thread overview]
Message-ID: <571F2E3D.1010303@linux.vnet.ibm.com> (raw)
In-Reply-To: <20160426111916.50d03e047aaed8112b235686@kernel.org>

Thanks Masami,

On Tuesday 26 April 2016 07:49 AM, Masami Hiramatsu wrote:
> On Tue, 26 Apr 2016 06:24:38 +0900
> Masami Hiramatsu <mhiramat@kernel.org> wrote:
>>> +/*
>>> + * NOTE:
>>> + * '.gnu.linkonce.this_module' section of kernel module elf directly
>>> + * maps to 'struct module' from linux/module.h. This section contains
>>> + * actual module name which will be used by kernel after loading it.
>>> + * But, we cannot use 'struct module' here since linux/module.h is not
>>> + * exposed to user-space. Offset of 'name' has remained same from long
>>> + * time, so hardcoding it here.
>>> + */
> BTW, is there no way to get the module name avoiding to access
> this "hidden" data structure?
> This looks very tricky way...

So this is the same approach kernel use to find module name when module is
loaded. Please refer this function for more detail:

kernel/module.c ::  static struct module *setup_load_info(...)

Regards,
Ravi

  reply	other threads:[~2016-04-26  9:01 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-25 10:38 [RFC] perf probe: Fix offline module name missmatch issue Ravi Bangoria
2016-04-25 10:38 ` [RFC] perf probe: Fix module probe issue if no dwarf support Ravi Bangoria
2016-04-25 21:29   ` Masami Hiramatsu
2016-04-26  9:04     ` Ravi Bangoria
2016-04-25 21:24 ` [RFC] perf probe: Fix offline module name missmatch issue Masami Hiramatsu
2016-04-26  2:19   ` Masami Hiramatsu
2016-04-26  9:00     ` Ravi Bangoria [this message]
2016-04-26  8:56   ` Ravi Bangoria
2016-04-26  9:15     ` Wangnan (F)
2016-04-26 10:45       ` Ravi Bangoria
2016-04-26 10:46     ` Masami Hiramatsu
2016-04-26 14:29       ` Ravi Bangoria

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