linux-kernel - Re: [PATCH 3/4] perf symbols: Record the build

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Message-Id: <20091118222910.8F6F51983@magilla.sf.frob.com>
Date:	Wed, 18 Nov 2009 14:29:10 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 3/4] perf symbols: Record the build_ids of kernel modules too

> +		snprintf(name, sizeof(name),
> +			 "/sys/module/%s/notes/.note.gnu.build-id", line);

The arch linker script for .ko's is free to fold notes into a single
section with a different name or suchlike, and maybe future ones will.  So
it's not pedantically kosher to assume the name of the section rather than
just looking at all the /sys/module/%s/notes/* files present until you find
NT_GNU_BUILD_ID.  (In practice there is probably only ever one file there
to look at, but you never know.)

Thanks,
Roland
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