linux-kernel - Re: [PATCH 4/6] kbuild: Support padding in kallsyms tables

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Message-ID: <20140208121241.GA401@x4>
Date:	Sat, 8 Feb 2014 13:12:41 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	mmarek@...e.cz, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 4/6] kbuild: Support padding in kallsyms tables

On 2014.02.08 at 08:50 +0100, Andi Kleen wrote:
> Add support for padding the variable length tables in kallsyms.
> This adds a new --pad=XXX option to kallsyms to specify the table lengths,
> and another option --pad-file=X to write the table lengths to a file.
> Then when a table is shorter than the padding add the necessary padding
> at the end.
> 
> This allows to replace an existing symbol table later with a different
> one that may differ slightly.
> 
> Add 5% slack for now in case the prediction is too small
> (can happen with LTO)

With attached config I get:

  KSYM    .tmp_kallsyms2.o
kallsyms: address pointers padding too short: 24495 missing
  OBJCOPY .tmp_kallsyms2.bin
  PATCHFILE vmlinux
Not enough padding in vmlinux for new kallsyms, missing 192120
Makefile:840: recipe for target 'vmlinux' failed

-- 
Markus

View attachment "config" of type "text/plain" (67313 bytes)