linux-kernel - Re: "N" symbols and System.map

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Message-ID: <20090501232149.GA28888@uranus.ravnborg.org>
Date:	Sat, 2 May 2009 01:21:49 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org
Subject: Re: "N" symbols and System.map

On Sat, May 02, 2009 at 01:10:18AM +0200, Andreas Schwab wrote:
> "H. Peter Anvin" <hpa@...ux.intel.com> writes:
> 
> > right now, we filter out symbols that nm tag N, meaning "debugging
> > symbols", from System.map.  However, at least on x86, the linker-generated
> > symbol _end is tagged N, and in fact is the only N in the entire image.
> >
> > Are there other architectures which would suffer if N were included in
> > System.map, or would that be a reasonable thing to do?
> 
> There should not be any N symbols unless you are using stabs debugging.

We have in vmlinux:
        .end : AT(ADDR(.end) - LOAD_OFFSET) {
                _end = .;
        }


And I see:
c1834000 N _end

This is the _only_ 'N' symbol in my vmlinux.

	Sam
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