linux-kernel - Re: [RFC PATCH] kernel/kallsyms.c: only show legal kernel symbol

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Message-ID: <CACVXFVN7PiU1dorkeamtC9-Wg_TVQE8xFiJtad-C8q4_=Rc1Ow@mail.gmail.com>
Date:	Sat, 26 Oct 2013 20:31:12 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chen Gang <gang.chen@...anux.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] kernel/kallsyms.c: only show legal kernel symbol

On Fri, Oct 25, 2013 at 7:58 PM, Rusty Russell <rusty@...tcorp.com.au> wrote:
>>
>> Basically these symbols are only used to generate code, and in
>> kernel mode, CPU won't run into the corresponding addresses
>> because the generate code is copied to other address during booting,
>> so I understand they won't appear in backtraces.
>
> An oops occurs when something went *wrong*.  We look up all kinds of
> stuff.  Are you so sure that *none* of the callers will ever see these
> strange symbols and produce a confusing result?

Suppose that might happen, kernel should be smart enough to know
that the address is not inside kernel address space and won't produce
confusing result, right?


Thanks,
-- 
Ming Lei
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