linux-kernel - modules, add_kallsyms() && DEFINE_PER

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Message-ID: <20131126175037.GE14028@redhat.com>
Date:	Tue, 26 Nov 2013 18:50:37 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: modules, add_kallsyms() && DEFINE_PER_CPU

On 11/26, Oleg Nesterov wrote:
>
> Note: this doesn't work for modules, but module's per-cpu data is
> not visible for kallsyms_lookup_name() anyway.

Rusty, I am just curious if it makes sense to change this or not...

But DEFINE_PER_CPU'ed symbols are ignored by add_kallsyms(). I guess
this is because is_core_symbol() requires "sh_flags & SHF_ALLOC".
And probably because of INIT_OFFSET_MASK.

Oleg.

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