linux-kernel - Re: [PATCH] scripts/kallsyms: filter symbols not in kernel address space

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Message-Id: <20131031154311.e65d16d79ba540ced736413b@linux-foundation.org>
Date:	Thu, 31 Oct 2013 15:43:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, Michal Marek <mmarek@...e.cz>
Subject: Re: [PATCH] scripts/kallsyms: filter symbols not in kernel address
 space

On Mon, 28 Oct 2013 23:48:59 +0800 Ming Lei <tom.leiming@...il.com> wrote:

> This patch uses CONFIG_PAGE_OFFSET to filter symbols which
> are not in kernel address space because these symbols are
> generally for generating code purpose and can't be run at
> kernel mode, so we needn't keep them in /proc/kallsyms.
> 
> For example, on ARM there are some symbols which are
> linked in relocatable code section, then perf can't parse
> symbols any more from /proc/kallsyms, and this patch fixes
> the problem.

This is a non-back-compatible change and I'd like to see a much
stronger assurance that it is safe to merge and will not break any
existing application on the planet, please.

For a start, please describe with great precision what these excluded
symbols are (examples would help) and explain why no application will
conceivably have had any use for them.

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